rfp #: 040821 574 rfp addendum #4 re and of page 1 of 1

RFP #: 040821‐574 Re‐Roofing and Renovations of Portable Buildings

RFP ADDENDUM #4 of 1

RFP ADDENDUM #4 Date of Addendum: May 7, 2021, 3:30 p.m.

NOTICE TO ALL POTENTIAL RESPONDENTS

The Request for Proposals (RFP) is modified as set forth in this Addendum. The original RFP Documents and any previously issued addenda remain in full force and effect, except as modified by this Addendum, which is hereby made part of the RFP. Respondent shall take this Addendum into consideration when preparing and submitting its Proposals.

PROPOSAL DESCRIPTION OF POSTING AND DISTRIBUTION

1. Please see attached.

ADDENDUM NO. 4 RFP# 040821-574 REROOFING AND RENOVATIONS

OF PORTABLE BUILDINGS DISD

DONNA, TEXAS

RIKE-OGDEN-FIGUEROA-ALLEX ARCHITECTS INC. ADDN#1-1

DATE: May 07, 2021

PRIOR TO GENERAL CONSTRUCTION PROPOSAL OPENING

PROPOSAL DATE: Tuesday, May 11, 2021 @ 10:00 A.M.

ARCHITECT: RIKE-OGDEN-FIGUEROA-ALLEX ARCHITECTS INC.

1007 Walnut Avenue

McAllen, Texas 78501

Total Pages: 36 - 8 ½” x 11

NOTICE:

A. The following changes, omissions or alterations to the specifications and drawings shall be made and insofar as the specifications and

drawings are inconsistent with the following, this addendum shall govern.

B. Acknowledge receipt of this addendum by inserting its number and date of issue in the place provided for same in the proposal. This

addendum forms a part of the Contract Documents.

C. It is imperative that this addendum be inserted INTO set of specifications.

Item No. 1 Donna Independent School District Addenda Clarifications:

A. Please visit Donna Independent School District procurement department website

https://tx50000621.schoolwires.net/Domain/60 to acknowledge addenda as follows:

a. Addendum No. 1.

b. Addendum No. 2.

c. Addendum No. 3.

Item No. 2 Specification Clarifications:

A. Section 01580 Project Sign: No project sign will be required.

B. Section 02050 Demolition: As noted in paragraph 1.01, A. 2 permits and fees shall be secured by

the contractor.

C. Add Section 03300 Cast in Place Concrete to project manual (03300-1 thru 03300-11).

D. Add Section 075420 Adhered Multi-Ply Roof System Over Metal Roof to specification manual and

shall be used for Building 1 / Records at W. A. Todd Middle School.

(075420 -1 thru 075420-23).

Item No. 3 Drawing Clarifications:

A. W. A. Todd Middle School Building 1/ Records: Provide material and labor to clean exterior metal

wall panels. Care should be taken to prevent water, soap or chemicals from penetrating into the

room.

B. Connecting Roofs: Donna High School: Between buildings 1 – 2 image 7, sheet PBR1.2,

Image 14, sheet PBR1.3. Between buildings 3 – 4 images 27,28, sheet PBR1.5. Image

30, sheet PRBR1.6.

Where roofs connect two portable buildings, provide materials and labor to tear off and remove

existing low slope membrane roofing systems down to the existing plywood deck

substrate, to include associated gutters, flashings, accessories, etc. Provide and install

Adhered Multi-Ply roof system as specified in Specifications Section 075419. Provide

one layer of 1.5” Polyisocyanurate rigid board insulation (not required to meet R-25 over

non-conditioned spaces), provide minimum ¼” per foot tapered Polyisocyanurate rigid

board tapered insulation to provide proper slopes to gutters, and install the specified ½”

Securock cover board. Mechanically fasten all layers as specified. Where low slope

membrane system ties-in to composition shingle roofs, provide manufacturer’s approved

detail at tie-in transition. Provide gutter edge similar to Detail 2 sheet A2.1.

RIKE-OGDEN-FIGUEROA- ALLEX ARCHITECTS INC. ADDN#1-2

C. Veterans Middle School:

1. Sheet PRB1.19 OF 98; add note no. 13 shall read as follows: Image 8, REPLACE

existing ceiling tile, ceiling grid to remain.

2. East Portable Building 1: Image 12 sheet PBR1.20, east classroom, east interior wall,

replace wall panels.

END OF ADDENDUM # 1

SECTION 03300

CAST-IN-PLACE CONCRETE

SECTION 03300 - 1

PART 1: GENERAL:

1.01 RELATED DOCUMENTS:

A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division-

1 Specification sections, apply to work of this section.

1.02 SUMMARY:

A. Extent of concrete work is shown on drawings.

1.03 SUBMITTALS:

A. Product Data: Submit data for non-proprietary materials and items, including reinforcement and forming

accessories, admixtures, patching compounds, waterstops, joint systems, curing compounds, dry-shake finish

materials, and others as requested by Architect.

B. Shop Drawings: Reinforcement: Submit original shop drawings by registered Professional Engineer for

fabrication, bending, and placement of concrete reinforcement. Comply with ACI 315 "Manual of Standard

Practice for Detailing Reinforced Concrete Structures" showing bar schedules, stirrup spacing, diagrams of

bent bars, arrangement of concrete reinforcement. Include special reinforcement required for openings

through concrete structures.

1.04 QUALITY ASSURANCE:

A. Codes and Standards: Comply with provisions of following codes, specifications, and standards, except where

more stringent requirements are shown of specified:

1. ACI 301 "Specifications for Structural Concrete for Buildings".

2. ACI 318 "Building Code Requirements for Reinforced Concrete".

3. Concrete Reinforcing Steel Institute (CRSI), "Manual of Standard Practice".

B. Materials and installed work may require testing and retesting at anytime during progress of work. Tests,

including retesting of rejected materials for installed work, shall be done at Contractor's expense.

PART 2 - PRODUCTS

2.01 FORM MATERIALS:

A. Forms for Exposed Finish Concrete: Plywood, metal, metal-framed plywood faced, or other acceptable panel-

type materials, to provide continuous, straight, smooth, exposed surfaces. Furnish in largest practicable sizes

to minimize number of joints and to conform to joint system shown on drawings.

B. Use plywood complying with U.S. Product Standard PS-1 "B-B (Concrete Form) Plywood", Class 1, Exterior

Grade or better, mill-oiled and edge-sealed, with each piece bearing legible inspection trademark.

C. Forms for Unexposed Finish Concrete: Plywood lumber, metal, or other acceptable material. Provide lumber

dressed on at least 2 edges and one side for tight fit.

D. Forms for Cylindrical Columns and Supports: Metal, fiberglass reinforced plastic, or paper of fiber tubes.

Construct paper of fiber tubes of laminated plies using water-resistant adhesive with wax-impregnated exterior

for weather and moisture protection. Provide units with sufficient wall thickness to resist loads imposed by

wet concrete without deformation.

SECTION 03300


SECTION 03300 - 2

E. Form Coatings: Provide commercial formulation form-coating compounds that will not bond with, stain, nor

adversely affect concrete surfaces, and will not impair subsequent treatments of concrete surfaces.

2.02 REINFORCING MATERIALS:

A. Reinforcing Bars: ASTM A 615, Grade 60, deformed.

B. Reinforcing Bars requiring welding: ASTM A 706, Grade 60, deformed.

C. Steel Wire: ASTM A 82, plain, cold-drawn steel.

D. Welded Wire Fabric: ASTM A 185, welded steel wire fabric.

E. Supports for Reinforcement: Bolsters, chairs, spacers, and other devices for spacing, supporting, and fastening

reinforcing bars and welded wired fabric in place. Use wire bar type supports complying with CRSI

specifications.

1. For slabs-on-grade, use supports with sand plates or horizontal runners where base material will not

support chair legs.

2. For tilt-up panels or exposed to view concrete surfaces, where legs of supports are in contact with forms,

provide supports with legs which are plastic protected (CRSI, Class 1) or stainless steel protected (CRSI,

Class 2).

2.03 CONCRETE MATERIALS:

A. Portland Cement: ASTM C 150, Type I, "Alamo Cement" or equal.

1. Use one brand of cement throughout project, unless otherwise acceptable to Architect.

B. Fly Ash: ASTM C 618, Type C or Type F.

C. Normal Weight Aggregates: ASTM C 33, and as herein specified. Provide aggregates from a single source

for exposed concrete.

1. For exterior exposed surfaces, do not use fine or coarse aggregates containing spalling-causing

deleterious substances.

2. Local aggregates not complying with ASTM C 33, but which have shown by special test or actual

service to produce concrete of adequate strength and durability may be used when acceptable to

Architect.

D. Water: Drinkable.

E. Water-Reducing Admixture: ASTM C 494, Type A, and containing not more than 0.1 percent chloride ions.

1. Available Products: Subject to compliance with requirements, products which may be incorporated in

the work include, but are not limited to, the following:

a. "WRDA Hycol"; W.R. Grace.

b. "PSI N"; Gifford-Hill/American Admixtures.

c. "Eucon WR-75"; Euclid Chemical Co.

d. "Pozzolith Normal"; Master Builders.

e. "Plastocrete 160"; Sika Chemical Corp.

f. "Chemtard",; Chem-Masters Corp.

g. "Pro-Kete-N"; Protex Industries, Inc.

F. Water-Reducing, Non-Chloride Accelerator Admixture: ASTM C 494, Type E, and containing not more than

0.1 percent chloride ions.

SECTION 03300


SECTION 03300 - 3


the work include, but are not limited to the following:

a. "Accelguard 80"; Euclid Chemical Co.

b. "Pozzolith High Early"; Master Builders.

c. "Gilco Accelerator"; Gifford-Hill/American Admixtures.

G. Water-Reducing, Retarding Admixture: ASTM C 494, Type D, and containing not more than 0.1 percent

chloride ions.


the work include, but are not limited to, the following:

a. "Edoco 20006"; Edoco Technical Products.

b. "Pozzolith Retarder"; Master Builders.

c. "Eucon Retarder 75"; Euclid Chemical Co.

d. "Daratard"; W.R. Grace.

e. "PSI R"; Gifford-Hill/American Admixtures.

f. "Plastiment"; Sika Chemical Co.

g. "Protard"; Protex Industries, Inc.

H. Prohibited Admixtures: Calcium chloride thyocyanates or admixtures containing more than 0.1 percent

chloride ions are not permitted.

2.04 RELATED MATERIALS:

A. Vapor Retarder: Provide vapor retarder cover over prepared base material where indicated below slabs on

grade. Use only materials which are resistant to decay when tested in accordance with ASTM E 154, as

follows:

1. Polyethylene sheet not less than 6 mils thick.

B. Non-Shrink Grout: CRD-C 621, Factory premixed grout.

1. Products: Provide the following or an approved equal:

a. "Utility Grout"; Sonneborn-Rexnord.

C. Bond Breaker: ASTM-C-309-74.

1. Products: Provide the following or an approved equal:

a. "Thompson's C & B"; Thompson & Formby.

D. Liquid Membrane-Forming Curing Compound: Liquid type membrane-forming curing compound complying

with ASTM C 309, Type I Class A. Moisture loss not more than 0.055 gr./sq. cm. when applied at 200 sq.

ft./gal.

1. Products: Provide the following:

a. "Sonosil; Sonneborn.

2.05 PROPORTIONING AND DESIGN OF MIXES:

A. Prepare design mixes for each type and strength of concrete by either laboratory trial batch or field experience

methods as specified in ACI 301. If trial batch method used, use an independent testing facility acceptable to

Architect for preparing and reporting proposed mix designs. The testing facility shall not be the same as used

for field quality control testing

B. Limit use of fly ash to not exceed 25 percent of cement content by weight.

SECTION 03300


SECTION 03300 - 4

C. Submit written reports to Architect and Structural Engineer of each proposed mix for each class of concrete at

least 15 days prior to start of work. Do not begin concrete production until mixes have been reviewed by

Architect.

D. Design mixes to provide normal weight concrete with the following properties, as indicated on drawings and

schedules:

1. 3000 psi 28-day compressive strength; W/C ratio, 0.58 maximum

(non-air-entrained), 0.46 maximum (air-entrained).

2. 4000 psi 28-day compressive strength; W/C ratio, 0.44 maximum

(non-air-entrained), 0.35 maximum (air-entrained).

E. Adjustment to Concrete Mixes: Mix design adjustments may be requested by Contractor when characteristics

of materials, job conditions, weather, test results, or other circumstances warrant; at no additional cost to

Owner and as accepted by Architect. Laboratory test data for revised mix design and strength results must be

submitted to and accepted by Architect before using in work.

F. Admixtures:

1. Use water-reducing admixture in concrete as required for placement and workability.

2. Use non-chloride accelerating in concrete slabs placed at ambient temperatures below 50 deg F (10 deg

C).

3. Use high-range water-reducing admixture in pumped concrete, concrete for industrial slabs, architectural

concrete, parking structure slabs, concrete required to be watertight, and concrete with water/cement

ratios below 0.50.

G. Slump Limits: Proportion and design mixes to result in concrete slump at point of placement as follows:

1. Ramps, slabs, and sloping surfaces: Not more than 5".

2. Reinforced foundation systems: Not less than 3" and not more than 5".

3. Other concrete: Not less than 3" nor more than 5".

2.06 CONCRETE MIXING:

A. Ready-Mix Concrete: Comply with requirements of ASTM C 94, and as herein specified.

B. During hot weather, or under conditions contributing to rapid setting of concrete, a shorter mixing time than

specified in ASTM C 94 may be required.

PART 3 - EXECUTION

3.01 GENERAL:

A. Coordinate the installation of joint materials and vapor retarders with placement of forms and reinforcing steel.

3.02 FORMS:

A. Design, erect, support, brace, and maintain formwork to support vertical and lateral, static, and dynamic loads

that might be applied until such loads can be supported by concrete structure. Construct formwork so

concrete members and structures are of correct size, shape, alignment, elevation, and position. Maintain

formwork construction tolerances complying with ACI 347.

B. Design formwork to be readily removable without impact, shock, or damage to cast-in-place concrete surfaces

and adjacent materials.

C. Construct forms to sizes, shapes, lines and dimensions shown, and to obtain accurate alignment, location,

grades, level and plumb work in finished structures. Provide for openings, offsets, sinkages, keyways,

SECTION 03300


SECTION 03300 - 5

recesses, moldings, rustications, reglets, chamfers, blocking, screeds, bulkheads, anchorages and inserts, and

other features required in work. Use selected materials to obtain required finishes. Solidly butt joints and

provide back-up at joints to prevent leakage of cement paste.

D. Fabricate forms for easy removal without hammering or prying against concrete surfaces. Provide crush plates

or wrecking plates where stripping may damage cast concrete surfaces. Provide top forms for inclined

surfaces where slope is too steep to place concrete with bottom forms only. Kerf wood inserts for forming

keyways, reglets, recesses, and the like, to prevent swelling and for easy removal.

E. Provide temporary openings where interior area of formwork is inaccessible for cleanout, for inspection before

concrete placement, and for placement of concrete. Securely brace temporary openings and set tightly to

forms to prevent loss of concrete mortar. Locate temporary openings on forms at inconspicuous locations.

F. Chamfer exposed corners and edges as indicated, using wood, metal, PVC, or rubber chamfer strips fabricated

to produce uniform smooth lines and tight edge joints.

G. Provisions for Other Trades: Provide openings in concrete formwork to accommodate work of other trades.

Determine size and location of openings, recesses, and chases from trades providing such items. Accurately

place and securely support items built into forms.

H. Cleaning and Tightening: Thoroughly clean forms and adjacent surfaces to receive concrete. Remove chips,

wood, sawdust, dirt, or other debris just before concrete is placed. Retightening forms and bracing after

concrete placement is required to eliminate mortar leaks and maintain proper alignment.

3.03 VAPOR RETARDED INSTALLATION:

A. Following leveling and tamping of granular base for slabs on grade, place vapor retarder sheeting with longest

dimension parallel with direction of pour.

B. Lap joints 6" and seal with appropriate tape.

3.04 PLACING REINFORCEMENT:

A. Comply with Concrete Reinforcing Steel Institute's recommended practice for "Placing Reinforcing Bars", for

details and methods of reinforcement placement and supports, and as herein specified.

B. Avoiding cutting or puncturing vapor retarder during reinforcement placement and concreting operations.

C. Clean reinforcement of loose rust and mill scale, earth, ice, and other materials which reduce or destroy bond

with concrete.

D. Accurately position, support, and secure reinforcement against displacement by formwork, construction, or

concrete placement operations. Locate and support reinforcing by metal chairs, runners, bolsters, spacers, and

hangers, as required.

E. Place reinforcement to obtain at least minimum coverages for concrete protection. Arrange, space, and

securely tie bars and bar supports to hold reinforcement in position during concrete placement operations. Set

wire ties so ends are directed into concrete, not toward exposed concrete surfaces.

F. Install welded wire fabric in as long lengths as practicable. Lap adjoining pieces at least one full mesh and

lace splices with wire. Offset end laps in adjacent widths to prevent continuous laps in either direction.

3.05 JOINTS

SECTION 03300


SECTION 03300 - 6

A. Construction Joints: Locate and install construction joints as indicated or, if not indicated, locate as required to

limit areas between to less than 5000 square feet and to not provide pours between joints greater than 75 feet

long in any direction and so as not to impair strength and appearance of the structure, as approved by

Architect.

3.06 INSTALLATION OF EMBEDDED ITEMS:

A. General: Set and build into work anchorage devices and other embedded items required for other work that is

attached to, or supported by, cast-in-place concrete. Use setting drawings, diagrams, instructions, and

directions provided by suppliers of items to be attached thereto.

B. Edge Forms and Screed Strips for Slabs: Set edge forms or bulkheads and intermediate screed strips for slabs

to obtain required elevations and contours in finished slab surface. Provide and secure units sufficiently

strong to support types of screed strips by use of strike-off templates or accepted compacting type screeds.

3.07 PREPARATION OF FORM SURFACES:

A. Clean re-used forms of concrete matrix residue , repair and patch as required to return forms to acceptable

surface condition.

B. Coat contact surfaces of forms with a form-coating compound before reinforcement is placed.

C. Thin form-coating compounds only with thinning agent of type, amount, and under conditions of form-coating

compound manufacturer's directions. Do not allow excess form-coating material to accumulate in forms or to

come into contact with in-place concrete surfaces against which fresh concrete will be placed. Apply in

compliance with manufacturer's instructions.

D. Coat steel forms with a non-staining, rust-preventative form oil or otherwise protect against rusting. Rust-

stained steel formwork is not acceptable.

3.08 CONCRETE PLACEMENT:

A. Preplacement Inspection: Before placing concrete, inspect and complete formwork installation, reinforcing

steel, and items to be embedded or cast-in. Notify other crafts to permit installation of their work; cooperate

with other trades in setting such work. Moisten wood forms immediately before placing concrete where form

coatings are not used.

B. Apply temporary protective covering to lower 2' of finished walls adjacent to poured floor slabs and similar

conditions, and guard against spattering during placement.

C. General: Comply with ACI 304 "Recommended Practice for Measuring, Mixing, Transporting, and Placing

Concrete", and as herein specified.

D. Deposit concrete continuously or in layers of such thickness that no concrete will be placed on concrete which

has hardened sufficiently to cause the formation of seams or planes of weakness. If a section cannot be placed

continuously, provide construction joints as herein specified. Deposit concrete as nearly as practicable to its

final location to avoid segregation.

E. Placing Concrete in Forms: Deposit concrete in forms in horizontal layers not deeper than 36" and in a manner

to avoid inclined construction joints. Where placement consists of several layers, place each layer while

preceding layer is still plastic to avoid cold joints.

F. Consolidate placed concrete by mechanical vibrating equipment supplemented by hand-spading, rodding, or

tamping. Use equipment and procedures for consolidation of concrete in accordance with ACI 309.

SECTION 03300


SECTION 03300 - 7

G. Do not use vibrators to transport concrete inside forms. Insert and withdraw vibrators vertically at uniformly

spaced locations not farther than visible effectiveness of machine. Place vibrators to rapidly penetrate placed

layer and at least 6" into preceding layer. Do not insert vibrators into lower layers of concrete that have begun

to set. At each insertion limit duration of vibration to time necessary to consolidate concrete and complete

embedment of reinforcement and other embedded items without causing segregation of mix.

H. Placing Concrete Slabs: Deposit and consolidate concrete slabs in a continuous operation, within limits of

construction joints, until the placing of a panel or section is completed.

I. Consolidate concrete during placing operations so that concrete is thoroughly worked around reinforcement

and other embedded items and into corners.

J. Bring slab surfaces to correct level with straightedge and strikeoff. Use bull floats or darbies to smooth

surface, free of humps of hollows. Do not disturb slab surfaces prior to beginning finishing operations.

K. Maintain reinforcing in proper position during concrete placement operations.

L. Cold Weather Placing: Protect concrete work from physical damage or reduced strength which could be

caused by frost, freezing actions, or low temperatures, in compliance with ACI 306 and as herein specified.

M. When air temperature has fallen to or is expected to fall below 40 deg F (4 deg C), uniformly heat water and

aggregates before mixing to obtain a concrete mixture temperature of not less than 50 deg F (10 deg C), and

not more than 80 deg F (27 deg C) at point of placement.

N. Do not use frozen materials or materials containing ice or snow. Do not place concrete on frozen subgrade of

on subgrade containing frozen materials.

O. Do not use calcium chloride, salt, and other materials containing antifreeze agents or chemical accelerators,

unless otherwise accepted in mix designs.

P. Hot Weather Placing: When hot weather conditions exist that would seriously impair quality and strength of

concrete, place concrete in compliance with ACI 305 and as herein specified.

Q. Cool ingredients before mixing to maintain concrete temperature at time of placement below 90 deg F (32 deg

C). Mixing water may be chilled or chopped ice may be used to control temperature provided water

equivalent of ice is calculated to total amount of mixing water. Use of liquid nitrogen to cool concrete is

Contractor's option.

R. Cover reinforcing steel with water-soaked burlap if it becomes too hot, so that steel temperature will

not exceed the ambient air temperature immediately before embedment in concrete.

S. Fog spray forms, reinforcing steel, and subgrade just before concrete is placed.

T. Use water-reducing retarding admixture (Type D) when required by high temperatures low humidity, or other

adverse placing conditions.

3.09 FINISH OF FORMED SURFACES:

A. Rough Form Finish: For formed concrete surfaces not exposed-to-view in the finish work or by other

construction, unless otherwise indicated. This is the concrete surface having texture imparted by form facing

material used, with tie holes and defective areas repaired and patched and fins and other projections exceeding

1/4" in height rubbed down or chipped off.

B. Smooth Form Finish: For formed concrete surfaces exposed-to-view, or that are to be covered with a coating

SECTION 03300


SECTION 03300 - 8

material applied directly to concrete, or a covering material applied directly to concrete, such as

waterproofing, dampproofing, veneer plaster, painting, or other similar system. This is as-cast concrete

surface obtained with selected form facing material, arranged orderly and symmetrically with a minimum of

seams. Repair and patch defective areas with fins or other projections completely removed and smoothed.

C. Smooth Rubbed Finish: Provide smooth rubbed finish to scheduled concrete surfaces, which have received

smooth form finish treatment, not later than one day after form removal.

1. Moisten concrete surfaces and rub with carborundum brick or other abrasive until a uniform color and

texture is produced. Do not apply cement grout other than that created by the rubbing process.

D. Refer Architectural drawings for finish of all tilt-up construction.

3.10 MONOLITHIC SLAB FINISHES:

A. Scratch Finish: Apply scratch finish to monolithic slab surfaces that are to receive concrete floor topping or

mortar setting beds for tile, portland cement terrazzo, and other bonded applied cementitious finish flooring

material, and as otherwise indicated.

B. Float Finish: Apply float finish to monolithic slab surfaces to receive trowel finish and other finishes as

hereinafter specified, and slab surfaces which are to be covered with membrane or elastic waterproofing,

membrane or elastic roofing, or sand-bed terrazzo, and as otherwise indicated.

1. After screening, consolidating, and leveling concrete slabs, do not work surface until ready for floating.

Begin floating when surface water has disappeared or when concrete has stiffened sufficiently to permit

operation of power-driven floats, or both, consolidate surface with power-driven floats, or by had-

floating if area is small or inaccessible to power units.

C. Trowel Finish: Apply trowel finish to monolithic slab surfaces to be exposed-to-view, and slab surfaces to be

covered with resilient flooring, carpet, ceramic or quarry tile, paint, or other thin film finish coating system.

1. After floating, begin first trowel finish operation using a power-driven trowel. Begin final troweling

when surface produces a ringing sound as trowel is moved over surface. Consolidate concrete surface

by final hand-troweling operation, free of trowel marks, uniform in texture and appearance, and with

surface leveled to tolerances. Grind smooth surface defects which would telegraph through applied

floor covering system.

D. Trowel and Fine Broom Finish: Where ceramic or quarry tile is to be installed with thin-set mortar, apply

trowel finish as specified, then immediately follow with slightly scarifying surface by fine brooming.

E. Non-Slip Broom Finish: Apply non-slip broom finish to exterior concrete platforms, steps, and ramps, and

elsewhere as indicated.

1. Immediately after float finishing, slightly roughen concrete surface by brooming with fiber bristle broom

perpendicular to main traffic route. Coordinate required final finish with Architect before application.

F. Slab surface tolerance shall have a minimum Floor flatness (Ff) 24 and Floor levelness (Fl) of 25 or greater.

Cut down high spots and fill low spots. Uniformly slope surfaces to drains.

3.11 CONCRETE CURING AND PROTECTION:

A. General: Protect freshly placed concrete from premature drying and excessive cold or hot temperatures.

B. Start initial curing as soon as free water has disappeared from concrete surface after placing and finishing.

Weather permitting, keep continuously moist for not less than 7 days.

C. Begin final curing procedures immediately following initial curing and before concrete has dried. Continue

final curing for at least 7 days in accordance with ACI 301 procedures. Avoid rapid drying at end of final

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SECTION 03300 - 9

curing period.

D. Provide curing and sealing compound to exposed interior slabs and to exterior slabs, walks, and curbs, as

follows:

E. Apply specified curing and sealing compound to concrete slabs as soon as final finishing operations are

complete (within 2 hours). Apply uniformly in continuous operation by power-spray or roller in accordance

with manufacturer's directions. Recoat areas subjected to heavy rainfall within 3 hours after initial

application. Maintain continuity of coating and repair damage during curing period.

F. Curing Unformed Surfaces: Cure unformed surfaces, such as slabs, floor topping, and other flat surfaces by

application of appropriate curing method.

G. Sealer and Dustproofer: Apply a second coat of specified curing and sealing compound only to surfaces given

a first coat.

3.12 REMOVAL OF FORMS:

A. Formwork not supporting weight of concrete, such as sides of beams, walls, columns, and similar parts of the

work, may be removed after cumulatively curing at not less than 50 deg F (10 deg C) for 24 hours after

placing concrete, provided concrete is sufficiently hard to not be damaged by form removal operations, and

provided curing and protection operations are maintained.

B. Formwork supporting weight of concrete, such as beam soffits, joints, slabs, and other structural elements, may

not be removed in less than 14 days and until concrete has attained design minimum compressive strength at

28 days. Determine potential compressive strength of in-place concrete by testing field-cured specimens

representative of concrete location or members.

3.13 RE-USE OF FORMS:

A. Clean and repair surfaces of forms to be re-used in work. Split, frayed, delaminated, or otherwise damaged

form facing material will not be acceptable for exposed surfaces. Apply new form coating compound as

specified for new formwork.

B. When forms are extended for successive concrete placement, thoroughly clean surfaces, remove fins and

laitance, and tighten forms to close joints. Align and secure joint to avoid offsets. Do not use "patched" forms

for exposed concrete surfaces, except as approved by Architect.

3.14 MISCELLANEOUS CONCRETE ITEMS:

A. Filling-In: Fill-in holes and openings left in concrete structures for passage of work by other trades, unless

otherwise shown or directed, after work of other trades is in place. Mix, place, and cure concrete as herein

specified, to blend with in-place construction. Provide other miscellaneous concrete filling shown or required

to complete work.

3.15 CONCRETE SURFACE REPAIRS:

A. Patching Defective Areas: Repair and patch defective areas with cement mortar immediately after removal of

forms, when approved by Architect.

B. Cut out honeycomb, rock pockets, voids over 1/4" in any dimension, and holes left by tie rods and bolts, down

to solid concrete but, in no case to a depth of less than 1". Make edges of cuts perpendicular to the concrete

surface. Thoroughly clean, dampen with water, and brush-coat the area to be patched with specified bonding

agent. Place patching mortar after bonding compound has dried.

C. For exposed-to-view surfaces, blend white portland cement and standard portland cement so that, when dry,

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SECTION 03300 - 10

patching mortar will match color surrounding. Provide test areas at inconspicuous location to verify mixture

and color match before proceeding with patching. Compact mortar in place and strike-off slightly higher than

surrounding surface.

D. Repair of Formed Surfaces: Remove and replace concrete having defective surfaces if defects cannot be

repaired to satisfaction of Architect. Surface defects, as such, include color and texture irregularities, cracks

spalls, air bubbles, honeycomb, rock pockets; fins and other projections on surface; and stains and other

discolorations that cannot be removed by cleaning. Flush out form tie holes fill with dry pack mortar, or

precast cement cone plugs secured with bonding agent.

E. Repair concealed formed surfaces, where possible, that contain defects that affect the durability of concrete. If

defects cannot be repaired, remove and replace concrete.

F. Repair of Unformed Surfaces: Test unformed surfaces, such as monolithic slabs, for smoothness and verify

surface place to tolerances specified for each surface and finish. Correct low and high areas as herein

specified. Test unformed surfaces sloped to drain for trueness of slope, in addition to smoothness using a

template having required slope.

G. Repair finished unformed surfaces that contain defects which affect durability of concrete. Surface defects, as

such, include crazing, cracks in excess of 0.01" wide or which penetrate to reinforcement or completely

through non-reinforced sections regardless of width, spalling, pop-outs, honeycomb, rock pockets, and other

objectionable conditions.

H. Correct high areas in unformed surfaces by grinding, after concrete has cured at least 14 days.

I. Correct low areas in unformed surfaces during or immediately after completion of surface finishing operations

by cutting out low areas and replacing with fresh concrete. Finish repaired areas to blend into adjacent

concrete. Proprietary patching compounds may be used when acceptable to Architect.

J. Repair defective areas, except random cracks and single holes not exceeding 1" diameter, by cutting out and

replacing with fresh concrete. Remove defective areas to sound concrete with clean, square cuts and expose

reinforcing steel with at least 3/4" clearance all around. Dampen concrete surfaces in contact with patching

concrete and apply bonding compound. Mix patching concrete of same materials to provide concrete of same

type of class as original concrete. Place, compact, and finish to blend with adjacent finished concrete. Cure in

same manner as adjacent concrete.

K. Repair isolated random cracks and single holes not over 1" in diameter by dry-pack method. Groove top of

cracks and cut-out holes to sound concrete and clean of dust, dirt, and loose particles. Dampen cleaned

concrete surfaces and apply bonding compound. mix dry pack, consisting of one-part portland cement to 2-

1/2 parts fine aggregate passing a No. 16 mesh sieve, using only enough water as required for handling and

placing. Place dry pack after bonding compound had dried. Compact dry-pack mixture in place and finish to

match adjacent concrete. Keep patched area continuously moist for not less than 72 hours.

L. Perform structural repairs with prior approval of Architect or Structural Engineer for method and procedure,

using specified epoxy adhesive and mortar.

M. Repair methods not specified above may be used, subject to approval of Architect.

3.16 QUALITY CONTROL TESTING DURING CONSTRUCTION:

A. The General Contractor shall employ a Testing Laboratory for testing services. (refer to SECTION

01400).

SECTION 03300


SECTION 03300 - 11

B. Sampling Fresh Concrete: ASTM C 172, except modified for slump to comply with ASTM C 94.

1. Slump: ASTM C 143; one test at point of discharge for each day's pour of each type of concrete;

additional tests when concrete consistency seems to have changed.

2. Air Content: ASTM C 173, volumetric method for lightweight or normal weight concrete; ASTM C

231 pressure method for normal weight concrete; one for each day's pour of each type of air-entrained

concrete.

3. Concrete Temperature: Test hourly when air temperature is 40 deg F (4 deg C) and below, and when 80

deg F (27 deg C) and above; and each time a set of compression test specimens made.

4. Compression Test Specimen: ASTM C 31; one set of 4 standard cylinders for each compressive

strength test, unless otherwise directed. Mold and store cylinders for laboratory cured test specimens

except when field-cure test specimens are required.

5. Compressive Strength Tests: ASTM C 39; one set for each day's pour exceeding 5 cu. yds. plus

additional sets for each 50 cu. yds. over and above the first 25 cu. yds. of each concrete class placed in

any one day; one specimen tested at 7 days, two specimens tested at 28 days, and one specimen retained

in reserve for later testing if required.

C. When frequency of testing will provide less than 5 strength tests for a given class of concrete, conduct testing

from at least 5 randomly selected batches or from each batch if fewer than 5 are used.

D. Strength level of concrete will be considered satisfactory if averages of sets of three consecutive strength test

results equal or exceed specified compressive strength, and no individual strength test result falls below

specified compressive strength by more than 500 psi.

E. Test results will be reported in writing to Architect, Structural Engineer and Contractor within 24 hours after

tests. Reports of compressive strength tests shall contain the project identification name and number, date of

concrete placement, name of concrete testing service, concrete type and class, location of concrete batch in

structure, design compressive strength at 28 days, concrete mix proportions and materials; compressive

breaking strength and type of break for both 7-day tests and 28-day tests.

F. Nondestructive Testing: Impact hammer, sonoscope, or other nondestructive device may be permitted but

shall not be used as the sole basis for acceptance or rejection.

G. Additional Tests: The testing service will make additional tests of in-place concrete when test results indicate

specified concrete strengths and other characteristics have not been attained in the structure, as directed by

Architect. Testing service may conduct tests to determine adequacy of concrete by cored cylinders complying

with ASTM C 42, or by other methods as directed. Contractor shall pay for such tests when unacceptable

concrete is verified.

END OF SECTION

SECTION 075420

ADHERED MULTI-PLY ROOF SYSTEM OVER METAL ROOF

SECTION 075420 - 1

PART 1 - GENERAL

1.01 AREAS COVERED

A. W.A. Todd Middle School Building 1/ Records Building. Refer to roof plans for areas to be included in the

scope of work.

1.02 DEFINITIONS

ACM Asbestos Containing Materials

ANSI American National Standards Institute

ASCE American Society of Civil Engineers

ASTM American Society for Testing and Materials

EPA Environmental Protection Agency

EPS Expanded Polystyrene

EVT Equiviscous Temperatures

FM Factory Mutual

IBC International Building Code

KEE Ketone Ethylene Ester

NDL No Dollar Limit

NESHAP National Emissions Standards for Hazardous Air Pollutants

NRCA National Roofing Contractors Association

OSHA Occupational Safety & Health Administration

SBS Styrene-Butadiene-Styrene

SDI Steel Deck Institute

SMACNA Sheet Metal and Air Conditioning Contractors National Association

SPRI Single Ply Roofing Industry

UL Underwriters Laboratories, Inc.

Refer to Specification Section 01 42 13 for Abbreviations and Symbols for further reference

1.03 REFERENCES (INCLUDING LATEST REVISIONS)

A. Comply with governing local, state, and federal regulations, safety standards, and codes.

B. Testing Laboratory Services: Test results shall meet or exceed established standards.

C. Underwriters Laboratories, Inc. (Roofing Covering): Class A fire hazard classification.

D. American Society for Testing and Materials (ASTM)

E. The National Roofing Contractors Association (NRCA) - Roofing and Waterproofing Manual

F. Sheet Metal and Air Conditioning Contractors National Association (SMACNA) - Architectural Sheet Metal

Manual

G. American Society of Civil Engineers – ASCE 7

1.04 INSTALLER QUALIFICATIONS

A. Roofing installer must be:

1. Currently certified or an approved applicator that is in good standing with the manufacturer.

SECTION 075420


SECTION 075420 - 2

2. Installer must be an experienced single firm specializing in the type of roofing repair and/or removal

and replacement work required, employing only experienced workers for the class of work in which

they are employed, having at least five (5) years successful experience on projects similar in size and

scope and acceptable as applicators by the Project Manager/Architect.

3. Contractor must have successfully completed previous projects warranted by the manufacturer.

B. It shall remain each Bidder's responsibility to determine his current status with the manufacturer's

certification plan.

1.05 MANUFACTURER QUALIFICATIONS

A. A qualified manufacturer that has been UL Listed and has FM Approvals for membrane roofing system similar

to that used in this project for a minimum of fifteen (15) years.

1.06 CONTRACT DOCUMENT QUALITY ASSURANCE

A. In the case of an inconsistency between the drawings and specifications or within either document not

clarified by addendum, the better quality or greater quantity of work shall be provided in accordance with the

Project Manager's/Architect's interpretation.

1.07 SUBMITTALS

A. Shop Drawings: Provide manufacturer's approved details of all perimeter conditions, projection conditions, and

any additional special job conditions which require details other than indicated in the drawings.

B. Refer to Specification Section 01 33 00 for Submittal requirements

1.08 DELIVERY, STORAGE, AND HANDLING

A. Deliver materials in manufacturer's original, unopened containers and rolls with all labels intact and legible

including labels indicating appropriate warnings, storage conditions, lot numbers, and usage instructions.

Materials damaged in shipping or storage shall not be used.

B. Manufacturer's packaging and/or roll plastic is not acceptable for exterior storage. Tarpaulin with grommets

shall be minimum acceptable for exterior coverings. All materials stored as above shall be a minimum of

four inches (4") off the substrate, and the tarpaulin tied off with rope.

C. Deliver materials requiring fire resistance classification to the job with labels attached and packaged as

required by labeling service.

D. Deliver materials in sufficient quantity to allow continuity of work.

E. Handle and store material and equipment in such a manner as to avoid damage. Liquid products shall be

delivered sealed, in original containers.

F. Handle rolled goods so as to prevent damage to edge or ends.

G. Select and operate material handling equipment so as not to damage existing construction or applied roofing.

H. Moisture-sensitive products shall be maintained in dry storage areas and properly covered. Provide

continuous protection of materials against wetting and moisture absorption. Store roofing and flashing

materials on clean raised platforms with weather protective covering when stored outdoors.

I. Store rolled goods on end. Thermoplastic membrane only rolls shall be laid flat.

SECTION 075420


SECTION 075420 - 3

J. Protect materials against damage by construction traffic.

K. The proper storage of materials is the sole responsibility of the contractor and any wet or damaged roofing

materials shall be discarded, removed from the project site, and replaced prior to application.

L. Comply with fire and safety regulations, especially with materials which are extremely flammable and/or

toxic. Use safety precautions indicated on labels.

M. Products liable, such as emulsions, to degrade as a result of being frozen shall be maintained above 40° F in

heated storage.

N. No storage of materials shall be permitted on roof areas other than those materials that are to be installed the

same day. Any exception must be in written form.

O. The contractor is to erect a temporary chain link fence, minimum six feet (6') in height, around work area

staging. Fence is to be secured on a daily basis.

1.09 SITE CONDITIONS

A. Job Condition Requirements:

1. Coordinate the work of the contractor with the work to be performed by other trades, to ensure proper

sequencing of the entire work. The contractor is to schedule his work so that adequate time is allowed

for other trades to perform their work.

2. Apply roofing in dry weather.

3. Do not apply roofing when ambient temperature is below 45° F.

4. Proceed with roofing work only when weather conditions are in compliance with manufacturer's

recommended limitations, and when conditions will permit the work to proceed in accordance with

specifications.

5. Schedule the work so the building will be left watertight at the end of each day. Do not remove more

roofing materials than can be reinstalled in any working day.

6. Load placed on the roof at any point shall not exceed the safe load for which the roof is designed.

7. All surfaces to receive new roofing shall be smooth, dry, and free from dirt, debris, and foreign

material before any of this work is installed. Competent operators shall be in attendance at all times

equipment is in use. Materials shall be stored neatly in areas designated by the Project

Manager/Architect.

8. The contractor is to be aware of the potential for roof leaks on the existing roof as a result of ruptured

blisters and/or roof mat damage caused by the vacuum process, foot traffic, or material and equipment

storage. The contractor is to take all necessary precautions to prevent damage to the existing roof. All

damage to the existing roof that could result in roof leaks is to be repaired on a daily basis by the

roofing contractor.

9. The contractor shall follow local, state, and federal regulations, safety standards, and codes for the

removal, handling, and disposal of asbestos containing materials, if present. When a conflict exists,

follow the stricter document.

10. Due caution should be exercised so as not to alter the structural integrity of the deck. When cutting

through any deck, care should be taken so as not to damage the deck or any part of the deck, such as

post tension cables, etc.

11. The contractor is to verify the location of all interior ducts, electrical lines, piping, conduit, and/or

similar obstructions. The contractor is to perform all work in such a manner as to avoid contact with

the above-mentioned items.

12. Surface and air temperatures should be a minimum 45° F during applications of cleaner and waterproof

coating and remain above 45° F for a minimum of four (4) hours following applications. Verify

compatibility of cleaner with coatings, paints, primers and joint sealers specified. Advise Project

Manager/Architect of any problems in this regard prior to commencing cleaning operations.

13. Temporary Sanitary Facilities:

SECTION 075420


SECTION 075420 - 4

a. The contractor shall furnish and maintain temporary sanitary facilities for employees use during this

project, including temporary toilets, wash facilities, and drinking water fixtures. Sanitary facilities

shall be secured to prevent tipping or movement.

b. Toilet units shall be self-contained, single-occupant, of the chemical, aerated recirculation, or combustion

type, properly vented and fully enclosed with a glass fiber reinforced polyester shell or similar

nonabsorbent material.

c. Facilities shall be installed where they will best service the project's needs, with Owner's/Owner's

Representative's approval.

d. Contractor shall provide toilet tissue, paper towels, paper cups, and similar disposable materials for each

facility. Provide covered waste containers for used material.

e. All portable facilities shall comply with local laws, codes, and regulations.

f. Contractor shall be responsible to see that the units are removed in a timely manner after the completion

of the project.

B. Protection of Work and Property:

1. Work: The contractor shall maintain adequate protection of all his work from damage and shall

protect the Owner's and adjacent property from injury or loss arising from this contract. Contractor

shall provide and maintain at all times any OSHA required danger signs, guards, and/or obstructions

necessary to protect the public and his workmen from any dangers inherent with or created by the

work in progress. All federal, state, and city rules and requirements pertaining to safety and all EPA

standards, OSHA standards, NESHAP regulations pertaining to asbestos as required shall be fulfilled

by the contractor as part of his proposal.

2. Property: Protect existing planting and landscaping as necessary or required to provide and maintain

clearance and access to the work of this contract. Examples of two categories or degrees of protection

are generally as follows: a) removal, protection, preservation, or replacement and replanting of plant

materials; b) protection of plant materials in place, and replacement of any damage resulting from the

contractor's operations.

3. Finished roof areas shall be protected from damage by the contractor during construction.

4. Twenty-four Hour Call: The contractor shall have personnel on call 24 hours per day, seven (7) days

per week for emergencies during the course of a job. The Owner/Project Manager/Architect is to have

the 24 hour numbers for the contact. Contractor must be able to respond to any emergency call and

have personnel on-site within two (2) hours after contact. Numbers available to the Owner/Project

Manager/Architect are to be mobile, home and office numbers for:

a) Job Foreman

b) Job Superintendent

c) Owner or Company Officer

C. Damage to Work of Others: The contractor shall repair, refinish, and make good any damage to the building

or landscaping resulting from any of his operation. This shall include, but is not limited to, any damage to

plaster, tile work, wall covering, paint, ceilings, floors, or any other finished work. Damage done to the

building, equipment, or grounds must be repaired at the successful contractor's expense holding the Owner

harmless from any other claims for property damage and/or personal injury.

D. Measurements: It will be the contractor's responsibility to obtain and/or verify any necessary dimensions by

visiting the job site, and the contractor shall be responsible for the correctness of same. Any drawings

supplied are for reference only.

E. Use of Premises:

1. The contractor is advised that the Owner will occupy the building at all times, and the contractor must

provide all safeguards required to protect personnel and to keep noise levels as low as reasonably

possible for each operation.

2. The contractor shall:

a) Coordinate work in such a manner as to not interfere with the normal operation of the building.

SECTION 075420


SECTION 075420 - 5

b) Assume full responsibility for protection and safekeeping of products stored on premises.

c) Agree to hold the Owner harmless in any and all liability of every nature and description which

may be suffered through bodily injuries, including death of any persons by reason of negligence of

the contractor, agents, employees, or subcontractors.

F. Cleaning and Disposal of Materials:

1. Contractor shall keep the job clean and free from all loose materials and foreign matter. Contractor

shall take necessary precautions to keep outside walls clean and shall allow no roofing materials to

remain on the outside walls.

2. All waste materials, rubbish, etc., shall be removed from the Owner's premises as accumulated.

Rubbish shall be carefully handled to reduce the spread of dust. A suitable scrap chute or hoist must

be used to lower any debris. At completion, all work areas shall be left broom clean and all

contractor's equipment and materials removed from the site.

3. All bituminous or roofing related materials shall be removed from ladders, stairs, railings, and similar

parts of the building.

4. Debris shall be deposited at an approved disposal site.

1.10 SEQUENCING AND SCHEDULING

A. Coordinate roofing schedule with work of other trades.

B. Plan lay up of roofing membrane with respect to deck slope. Avoid situations where excessive drainage

could pass into completed roofing.

C. Maintain communication with roofing manufacturer's representative to inform of progress and to schedule

periodic inspections.

D. All penetrations shall be made in roof prior to beginning with roof installation.

1.11 PERFORMANCE REQUIREMENTS

A. Roofing System: Shall prevent water migration into roof assembly or building interior through the roof

membrane and/or membrane base flashing.

1.12 QUALITY ASSURANCE

A. Work of this Section to conform to these specifications, and to the roofing material manufacturer's application

instructions. In the event of conflicts between the two, the more stringent requirement shall be observed.

B. Maintain one copy of each document on site.

SECTION 075420


SECTION 075420 - 6

C. Factory Technical Representative: Roofing Contractor is to arrange and schedule the manufacturer’s technical

representative to be on site the first day of the installation of manufacturer’s roofing system. The manufacturer's

technical representative shall inspect the work of the contractor at least one time each week during the

installation of the roofing system. The manufacturer's technical representative shall perform with the owner's

representative and the roofing contractor a final inspection of the roofing system. At the completion of the final

inspection, provide to the roofing contractor a list of punch list items (if any) to be correct before technical

acceptance of the roofing project and prior to issuance of manufacturer's Twenty (20) Year NDL Full System

Warranty. Field reports shall be provided after each inspection within five (5) days of site visit.

D. Pullout Tests: Conduct pullout test on deck using appropriate fastener prior to roof system installation. Submit

pullout results for manufacturer's review to determine specific fastening pattern for this project, minimum uplift

requirements shall conform to current ASCE 7 criteria.

1.13 QUALIFICATIONS

A. Manufacturer: Company specializing in manufacture of the products specified, with five (5) years documented

experience in the uninterrupted, and unmodified manufacture of the roofing system and component elements

of the roofing system specified herein.

B. Applicator: Company specializing in the work of this Section, having a minimum of five (5) years documented

experience applying modified bitumen roofing systems, and approved by the Manufacturer for not less than

three (3) years to install the specified roof system so as to achieve a twenty (20) year no dollar limit full system

warranty.

1.14 REGULATORY REQUIREMENTS

A. Conform to all applicable local codes for roof assembly fire hazard requirements.

B. Provide certification of inspection confirming approval of design and installation by authority having

jurisdiction.

C. Fire Hazard Classifications: UL Class A.

1.15 PRE-INSTALLATION CONFERENCE

A. Convene a preinstallation conference two weeks prior to commencing the Work.

B. Require attendance of parties directly affecting the Work of this Section.

C. Review condition of roof deck and installation, installation procedures and coordination with related work.

1.16 ENVIRONMENT REQUIREMENTS

A. Do not apply roofing during inclement weather.

B. Do not apply roofing membrane to damp or frozen deck or substrate.

1.17 WARRANTY

A. Roofing - Manufacturer: Project shall be installed in such a manner that the roofing material manufacturer

will furnish a written Twenty (20) Year NDL Full System Warranty.

B. Warranty: The complete roofing system (from top of deck/substrate up) shall be guaranteed for a minimum of

twenty (20) years from the date of Substantial Completion for this project. Guarantee responsibilities shall be as

follows:

SECTION 075420


SECTION 075420 - 7

C. Roofing - Contractor: The contractor, jointly with any subcontractors employed by him, shall guarantee the

work required and performed under this contract will be free from defects in workmanship and materials, and

that the building will be and remain waterproof for a two (2) year warranty period, after the Owner accepts the

work as substantially complete. The warranty shall be in approved notarized written form, to obligate the

contractor and his subcontractors, if any, to make good the requirements of the warranty.

D. The materials manufacturer shall guarantee the entire roofing system as supplied by system manufacturer for a

total period of twenty (20) years from the date of substantial completion.

E. Membrane manufacturer shall provide the written warranty as specified.

F. The entire roofing system (from top of deck/substrate up) shall be guaranteed to be watertight and against any

failures of workmanship and materials. Repair of the system, including materials and labor, shall be done at no

cost to the Owner.

G. Warranty repairs shall be performed by a certified installer. The repairs shall be performed in accordance with

the manufacturer's written instructions and recommended procedures so as to not void the warranty.

H. During the proposal period each Contractor shall make arrangements with the materials manufacturer to provide

the required warranty. Refer to SUBMITTALS paragraph in this section for requirements concerning submittals

of warranty.

E. New work shall be installed so as not to affect or void existing manufacturer's warranty.

PART 2 - PRODUCTS

2.01 GENERAL

A. Compatibility: Provide materials that are recommended by manufacturers to be fully compatible with indicated

substrates, or provide separation materials as required to eliminate contact between incompatible materials.

B. Materials herein specified shall be supplied or approved in writing by the manufacturer issuing the warranty.

C. The white polyester reinforced fleece backed PVC with Elvaloy® adhered roofing system shall only be applied

by manufacturer approved and trained roofing contractors.

D. The manufacturer shall have 15 years UL listing for the membrane to be used on the project. Membrane

manufacturer shall have a minimum of 15 years FM approval, and 15 years manufacturing experience with the

roofing membrane specified for this project.

E. All roofing and roof accessories shall be installed in compliance with manufacturer's current specifications and

details.

F. All materials used on the project shall be asbestos free.

2.02 ROOFING MEMBRANE

A. The white 60 mil polyester reinforced fleece backed PVC with Elvaloy® membrane shall have the following

minimum physical properties:

Property Test Procedure Physical Properties

Color ASTM D 751 White

Thickness ASTM D 751 60 mil (.060”)

Thickness over Scrim ASTM D 7635 .030”

Polyester Fleece Backing 5.5 oz.

Reinforcement Scrim Polyester

Solar Reflectance Index (SRI) ASTM E 1980 10

SECTION 075420


SECTION 075420 - 8

B Basis of Design: Flex FB 60 Elvaloy® KEE Roof Membrane as manufactured by Flex Membrane International.

C. Approved Manufacturer’s and Membranes:

1) Flex The Garland Company / KEE- Stone® FB 60 mil

2) Tremco Roofing & Waterproofing / TPA FB 60 mil Roof Membrane

3) Membrane International Corp. / Flex FB 60 Elvaloy® KEE Roof Membrane

2.03 BASE FLASHING MEMBRANE

A. The flashing membrane shall be a white Elvaloy® polyester reinforced flexible sheet shall have the following

minimum physical properties:


Color ASTM D 751 White

Thickness ASTM D 751 60 mil (.060”)

Thickness over Scrim ASTM D 7635 .031”

Reinforcement Scrim Polyester

Solar Reflectance Index (SRI) ASTM E 1980 109

A. Basis of Design: Flex MF/R 60 Elvaloy® KEE Roof Membrane as manufactured by Flex Membrane International.

B. Approved Manufacturer’s and Membranes:

a. Flex Membrane International Corp. / Flex MF/R 60 Elvaloy® KEE Roof Membrane

b. The Garland Company / KEE-Stone 60 mil

c. Tremco Roofing & Waterproofing / TPA Flashing Membrane 60 mil

2.04 NON-REINFORCED MEMBRANE

A. The non-reinforced PVC with Elvaloy® membrane shall have the following minimum properties,.

1. Description: Non-reinforced thermoplastic white membrane, thickness approximately 45 mils.

2. Use: Inside/outside corners, multiangled intersections, sealant pockets and other conditions where

molding of the membrane is required.

2.05 CAULKS

A. Sealant for use at coping joints, reglet joints, etc., shall be a one-component urethane non-sag, gun grade sealant

designed for use in active exterior joints, and shall meet or exceed Federal Specification No. 1 TT-S-00230C,

Type II, Class A, ASTM C 920. Where joint surfaces are contained or are contaminated with bituminous

materials, provide manufacturer's modified-type sealant (modified with coal-tar or asphalt as required), or

approved equal.

SECTION 075420


SECTION 075420 - 9

B. To seal the leading edge of the membrane, to bond membrane at terminations with metal, and for open seam

repair, sealant shall be a thermosetting, solvent free, non-slump, self-fixturing, multipurpose structural sealant

which shall meet the following physical and performance properties, M-1 as manufactured by Chem Link Inc.,

or approved equal.

Properties

Specific Gravity 1.62 (13.5 lbs./gallon)

Viscosity 800,000 cps Brookfield RTV, TF spindle, 4 rpm 70° F.

Shear Strength (ASTM D-1002) 300 psi+ (7 day ambient cure)

Elongation @ break (ASTM D-412) 300% (7 day ambient cure)

Hardness Shore A (ASTM C-661) 50 – 55 (14 day ambient cure)

Tack free time (ASTM C-679) 35 minutes

Low temperature flex Minus 20° F: PASS

Slump (sag) (ASTM C-639) Zero slump

Shrinkage (ASTM D-2453) No measurable shrinkage (14 cay cure)

Service temperature -40° F to 200° F

2.06 BASE MEMBRANE

A. Shall be A Styrene Butadiene Styrene (SBS) 80 mils thick, smooth surfaced modified

bitumen base sheet, tested in accordance with ASTM D 5147, as approved by field

membrane manufacturer.

B. Basis of Design: Flex SBS 80 mil S/S Base Sheet Roof Membrane as manufactured by

Flex Membrane International.

C. Approved Manufacturer’s and Membranes:

a. Flex Membrane International Corp. / Flex SBS 80 Mil S/S Base Sheet

b. The Garland Company / Stress Base

c. Tremco Roofing & Waterproofing / POWERply Standard Smooth

2.07 FILLER FOR FLUTES

B. Expanded polystyrene board of appropriate thickness to match depth of flute of metal roof.

C. Expanded polystyrene, one and one-fourth pound (1-1/4#) density, preformed to fill flute and match height of

flange.

2.08 INSULATION

B. All insulation shall be approved in writing by the membrane manufacturer as to thickness, type, and

manufacturer. All insulation must be approved for the specific application, Underwriters Laboratory approved,

and be listed in the FM Global Approval Guide.

C. Polyisocyanurate Roof Insulation: Insulation shall be a single layer of rigid polyisocyanurate foam board; total

thickness and LTTR-value shall be a minimum of 1.0" = 5.7; meeting Federal Specification No. HH-I-1972/1 or

2 with 20 psi minimum compressive strength and nominal 2.0 pcf density. Boards shall be surfaced on two (2)

sides with non-asphaltic facer material.

2.09 COVER BOARD

SECTION 075420


SECTION 075420 - 10

A. Impact-resistant, nonstructural, specially engineered gypsum and cellulose fiber panels with 95% recycled content;

uniform water-resistance throughout core and surface. Board size four feet by eight feet (4' x 8'), thickness 1/4" =

R of 0.2; conforming to ASTM C 1278, meeting FM 4470 Class 1 criteria, classified by Underwriters

Laboratories, and listed in the FM Global Approval Guide. Board will meet the following physical properties,

Securock® Roof Board, as manufactured by USG Corporation, or approved equal.

Test Typical Value Test Method

Fire Resistance Class A UL 790

Permeance ≤ 30 ASTM C473

Surface water absorption ≤ 1.6 nominal grams ASTM C473

Water resistance Maximum 10% weight percentage gain

Mold Resistance Minimum rating of "10" ASTM D3273

2.10 CANT STRIP

A. Structural: Shall be wood where used for structural purposes meeting NRCA, FM Global and Underwriters

Laboratory guidelines.

B. Non-structural: Shall be wood fiber where used for non-structural purposes, conforming to ASTM C208 and

C209.

2.11 ROUGH LUMBER

A. Refer to Specification Section 06 10 53 Miscellaneous Carpentry for further information

B. All wood nailers, structural cants, curbs, and other miscellaneous rough carpentry, shall be lumber as

recommended by NRCA, and Underwriters Laboratory guidelines.

C. Vertical Wall Shimming Material: Shall be exterior grade plywood unless otherwise accepted by Project

Manager/Architect. Thickness shall be as required for attachment or to make material flashing flush or level

with offsets and/or transitions, minimum three-fourths inch (3/4"). Proper selection of material is required to

achieve UL guidelines.

2.12 SEALANTS

A. One-part Urethane Sealant: Sealant for use at coping joints, reglet joints, etc., shall be a one-component, high

performance, non-priming, non-sag, gun grade elastomeric polyurethane sealant designed for use in active

exterior joints, ASTM C 920, shall meet the following physical and performance properties, SONOLASTIC®

NP 1™ as manufactured by BASF Construction Chemicals, LLC, or approved equal.

Properties Results Test Methods

Movement capability, % ±35 ASTM C719

Tensile strength, psi (MPa) 350 (2.4) ASTM D412

Tear strength, pli 50 ASTM D1004

Ultimate elongation at break, % 800 ASTM D412

Rheological, at 120° F (49° C) No sag ASTM C639

(sag in vertical displacement)

Extrudability, 3 seconds Passes ASTM C603

Hardness, Shore A ASTM C661

At standard conditions 25 – 30

After heat aging (max Shore A: 50) 25

Weight loss, after heat aging 3% ASTM C792

Cracking and chalking, after heat aging None ASTM C792

Tack-free time, hrs, (maximum 72 hrs) Passes ASTM C679

Stain and color change Passes (no visible stain) ASTM C510

Bond durability,* on glass, aluminum, Passes ASTM C719

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SECTION 075420 - 11

and concrete ±35% movement

Adhesion* in peel, pli (min. 5 pli) 30 ASTM C794

Adhesion* in peel after UV radiation Passes ASTM C794

through glass (min. 5 pli)

Artificial weathering, Xenon arc, 250 hours Passes ASTM C793

Artificial weathering, Xenon arc, 3,000 hours No surface cracking ASTM G26

Water immersion, 122° F (50° C) Passes 10 weeks with ASTM C1247

movement cycling

*Primed for water immersion dictated by ASTM C920.

B. Silyl-terminated Polyether Sealant: Sealant shall be a thermosetting, solvent free, non-slump, self-fixturing,

multipurpose structural sealant which shall meet the following physical and performance properties, M-1 as

manufactured by Chem Link, Inc., or approved equal.

Properties

Specific Gravity 1.62 (13.5 lbs./gallon)

Viscosity 800,000+ cps Brookfield RTV, TF spindle, 4 rpm 73° F.

Shear Strength (ASTM D-1002) 400 psi+ (7 day ambient cure)

Elongation @ break (ASTM D-412) 400-550% (7 day ambient cure)

Hardness Shore A (ASTM C-661) 45 ± 3

Tack free time (ASTM C-679) 20 minutes

Low temperature flex ASTM D-816) Minus 10° F pass 1/4" mandrel

Slump (sag) (ASTM C-697) Zero slump

Shrinkage (ASTM D-2453) No measurable shrinkage (after 14 days)

Service temperature -40° F to 200° F continuous service

2.13 FASTENERS AND PLATES

A. Fasteners and fastening plates or bars shall be listed in the FM Global Approval Guide, and be as recommended

by the fastener manufacturer for the specific application.

B. Fastener for Steel Deck: Shall be a #14 fastener, fluorocarbon coated, with CR-10 coating. A minimum .200

diameter shank and .250 diameter thread. To be used with round pressure plates or bar, and having a

fluorocarbon CR-10 coating, when subjected to thirty (30) Kesternich cycles (DIN 50018) shows less than ten

percent (10%) red rust which surpasses FM Global Approval Standard 4470 as manufactured by Olympic

Manufacturing Group, Inc., or approved equal. Fasteners, plates, and/or bars shall be listed in the FM Global

Approval Guide.

C. Fastener for Purlin: Shall have a shank diameter of .168 and a thread diameter of .205. The purlin fastener will

be used with a FM Global approved two inch (2") round steel barbed pressure plate, or approved equal.

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SECTION 075420 - 12

2.14 COLD PROCESS MODIFIED BITUMEN ADHESIVE

A. Shall be a fibrated rubberized adhesive specially formulated for horizontal applications of roofing plies, having

the following minimum properties, as manufactured by the manufacturer or approved equal.

Physical Properties

Stormer viscosity @ 77° F 100-140 sec. (ASTM D-4479

Density @ 77° 7.9 –8.3 lbs./gal. (ASTM D-1475)

Solids by Weight 61-65% minimum (ASTM D-4479)

Flash Point 100° F minimum (ASTM D-3278)

Moisture by Weight 2.5% maximum (ASTM D-4479)

Mineral/Other stabilizers by wt. 15-18% (ASTM D-4479)

Asphalt by weight 45% (ASTM D-3019)

Lap Adhesion @ 24 hours cure 30 lbf/in. min. (ASTM D-3019)

Color Black

Material shall be tested in accordance with ASTM D-3019, Type III and Dade County Compliance

No. (95-0228).09

2.15 COLD APPLIED SUBSTRATE FIELD ADHESIVE

A. Shall have the following minimum properties, as manufactured by manufacturer or approved equal.

Property Characteristics

Type Rubber, asphalt, resin dispersion; Water vehicle

Color Dried Film Black

Viscosity Approximately 18,000 cps. (Brookfield at 77° F)

Heavy paint consistency -- readily pourable

Solids, Wt. % Approximately 75%

Application Procedure Brush, squeegee or roller

Working Period Remains tacky permitting wet or dry combining over wide

range of conditions.

Application Limits (Temp.) Between 50 and 100° F. However apply at near mid-temperature

range whenever possible.

Service After Application Not affected by extremes in atmospheric conditions. Maintains good

bond over range minus 20° F to plus 200° F. Excellent water and

moisture resistance.

Caution Keep from freezing. Store above 40° F

Weight per Gallon Net Approximately 8.4 lbs.

Container Sizes 5 gallon

Primer Use When the product is used over cementitious surfaces, the surface must

first be primed 24 hours before adhesive applications. The primer

should be a solvent base asphalt cut back. The application rate is

approximately 3/4 gallon per 100 square feet.

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SECTION 075420 - 13

2.16 BONDING ADHESIVE FOR FLASHING

A. Description: Adhesive is a bonding cement of synthetic rubber for fully adhering membranes to various

substrates, Shall be Supplied by the membrane manufacturer

Typical Liquid Properties (Room Temperature)

Color Amber/Yellow

Base Product Neoprene

Solids 25%

Specific Gravity .87

Pounds/Gallon 7.25

Viscosity (CPS) 2500

Solvents Ketone, Toluene, Aliphatic Hydrocarbon, Zylene

Estimated Coverage

2 Sided Application 55/70 sq. ft. (2/2.5 mils dry)

DOT Label Required Flammable Liquid

Code - 584661

B. Handling: Contains ingredients which could be harmful if mishandled. Contact with skin and eyes should be

avoided and necessary protective equipment and clothing should be worn.

2.17 ASPHALT ROOF PRIMER

A. Quick-dry asphalt-based primer for priming of asphalt roof surfaces, Shall be Supplied by the membrane

manufacturer

Applicable Federal Specification SS-A-701B

ASTM D 41

Flash Point 105° F

Viscosity at 80° F (ASTM D 217) 50-60 K.U.

Weight per gallon 7.4 pounds

Drying time (to touch) Min. 4 hours

2.18 TRIM STRIP

A. The trim strip shall have the following minimum properties, Shall be Supplied by the membrane manufacturer

1. Eight inch (8") wide non-reinforced 45 mil thermoplastic used for capping butted ends of rolls.

2. The trim strip is seamed with the use of hot-air welding.

2.19 PREFABRICATED CORNERS

A. Inside and outside corners shall be supplied by the membrane manufacturer and shall be of the same base

material as the roof membrane.

2.20 PIPE BANDS

A. Stainless steel bands with self-locking heads.

B. Tighten with hand tool for tension control and flush cut off.

2.21 PRE-MOLDED BOOTS

A. Non-reinforced thermoplastic tapered molds for various pipes, heat welded to field membrane and sealed at top

with stainless steel pipe bands and seam sealer.

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SECTION 075420 - 14

2.22 PITCH PAN SEALANT

A. Shall be one-part, self-leveling polyurethane sealant meeting Federal Specification No. TT-S-00230C, Type I,

Class A, ASTM C 920, Type S, Grade P, Class 25, for use in new pitch pans, Shall be Supplied by the

membrane manufacturer

2.23 PIPE SUPPORTS

A. Pipe support system shall be a prefabricated, engineered support system designed specifically for use on

roofing without adhesive, roof penetrations, flashings, or damage to roofing system. Supports shall be as

recommended by manufacturer as suitable for size and type of conduit or pipe being supported or approved

equal.

B. Refer to Specification Section 07 72 00 Roof Accessories for further information.

2.24 WALKWAY PAD

A. The walkway pad shall have the following minimum physical properties, and be applied with edges heat or

solvent welded, Shall be Supplied by the membrane manufacturer


Color Gray

Size 36" wide x 60' long

Thickness ASTM D 638 .080" nominal

Reinforcement 1000 Denier Polyester

Tear Strength ASTM D 751 210 X 200 lbf

Puncture Resistance 96 lbs

Cold Resistance ASTM D 1043 -40° C

Shore A Durometer 85

Hydrostatic Resistance 400 psi

Dimensional Stability ASTM D 1240 ≤ 1%

Ultraviolet Stability 12,000 hrs. Excellent

2.29 TERMINATION/PRESSURE BARS

A. Aluminum strip shall be extruded channel bar with a mill finish, width one inch (1"), thickness 0.100" ± .008",

leg height one-fourth inch (1/4") top and bottom, leg angle ninety degrees (90°), for perimeter and curb

anchorage, having predrilled holes six inches (6") on center, Shall be Supplied by the membrane manufacturer.

2.30 T- JOINT COVERS

A. Supplied by the membrane manufacturer as a secondary covering to all T – Joints in the

installation of thermoplastic roof systems consisting of waterproofing coverings equal to or

greater than 60 mils in thickness.

2.31 ELASTOMERIC SEALANT

A. Multi-Component Polysulfide Sealant: Except as otherwise indicated, provide manufacturer's standard,

non-modified, 2-or-more-part, polyurethane-based, elastomeric sealant; complying with either ASTM C 920,

Type M, Class 25, or FS TT-S-00227E, Class A; self-leveling grade/type where used in joints of surfaces

subject to traffic, otherwise non-sag grade/type, as manufactured by BASF, or approved equal.

B. Durability: Less than 0.5 square inch adhesion/cohesion loss for three (3) samples of both mortar and

aluminum; ASTM C 719 test procedure.

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SECTION 075420 - 15

C. Adhesion in Peel: Fifteen pound (15#) peel strength and 10% maximum loss of bond to substrate; ASTM

C 794.

D. Bituminous Modification: Where joint surfaces contain or are contaminated with bituminous materials,

provide manufacturer's modified type sealant which is compatible with joint surfaces (modified with coal-tar

or asphalt as required).

2.37 DELIVERY AND STORAGE

A. All materials shall be delivered with appropriate carton and can labels indicating appropriate warnings,

storage conditions, lot numbers, and usage instructions. Materials damaged in shipping or storage shall not

be used.

2.38 PRECAUTIONS

A. Some of the indicated materials are extremely flammable and/or toxic. Use precautions indicated on can and

carton labels.

2.39 MISCELLANEOUS MATERIALS

A. Other materials shall be as specified, or of the best grade for the proposed use, as recommended by the

manufacturer of said product.

2.42 SELF-ADHERING UNDERLAYMENT FOR TEMPORARY WATERPROOFING

A. A premium heavyweight, minimum 60 mil, high temperature (260 degree) self-adhering underlayment, to use

as a temporary waterproofing barrier.

2.43 OVERNIGHT SEAL

A. A premium heavyweight, minimum 60 mil, high temperature (260 degree) self-adhering underlayment, to use

as a temporary waterproofing barrier.

PART 3 - EXECUTION

3.01 REFERENCE

A. The manufacturer's Technical Specifications shall be considered a part of this specification and should be

referred to for more specific application procedures and recommendations.

B. Application of materials shall be in strict accordance with the manufacturer's recommendations except where

more stringent requirements are shown or specified. In the instance of a conflict between these specifications

and those of the manufacturer, the more stringent specifications shall take precedence.

C. General Installation:

1. Protect adjacent areas with tarpaulin or other durable materials.

2. Contractor shall prevent overspray and be responsible for parking lot areas and/or adjoining areas not part

of this contract.

3. Contractor shall be responsible for sealing, as required, all openings that may allow adhesive/bitumen

migration or drippage, i.e. pitch dams, envelopes, and filler strips.

4. Prepare surfaces according to manufacturer's or applicator's published instructions. All metal that is to

receive bitumen, or come in contact with bitumen or adhesive, shall be first primed with appropriate

primer. Any prefinished sheet steel that is to receive bitumen, or come in contact with bitumen or

adhesive, shall be scored, scuffed or abraded prior to receiving primer.

5. Use cleaning materials or primers necessary to render an acceptable surface/substrate.

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SECTION 075420 - 16

6. All surfaces/substrates shall be clean and dry prior to application of materials.

7. Prior to application of felts and membrane, all foreign matter, gravel, etc., shall be removed from the

insulation and/or substrate. Gravel or debris between the insulation/substrate and plies is not acceptable.

8. Circulate bituminous materials.

9. Wrinkles, buckles, kinks, and fishmouths are not acceptable when laying membrane.

10. Where deteriorated base flashing is removed, primed cant strips shall be installed at the intersection of

the deck and the vertical surfaces. All flashings shall be mechanically top-fastened with a termination

bar a minimum of six inches (6") on center at the top leading edge and be a minimum of eight inches (8")

in height from finished membrane.

11. Provide a water test of each roof section prior to substantial completion. The test should simulate rainfall

of one inch (1") per hour minimum.

12. On slopes greater than one inch (1") in twelve inches (12"), refer to NRCA and/or manufacturer's

guidelines for backnailing procedures and follow the more stringent guidelines for all specified materials.

13. Provide water-tight tie-in as necessary daily.

3.02 EXAMINATION

A. Verify that surfaces and site conditions are ready to receive the Work of this Section.

B. Verify that deck is secure, that it is clean and smooth, free of depressions, waves, abrupt elevation change,

protrusions, or projections and properly sloped to drains.

C. Verify that substrate surfaces are dry and free of frost, dew or other moisture.

D. Verify that roof openings, curbs, sleeves and vents through the roof are solidly set and ready to receive this

Work.

3.03 SUBSTRATE PREPARATION

A. Layover Existing: Remove all dust, dirt, and debris by use of vacuum or blower. Substrate shall be smooth and

free of debris, sharp edges, and other surface irregularities prior to work starting. All rusted areas of the existing

metal roof shall be treated with approved rust arresting paint applied in accordance with the manufacturer's

instructions. Ensure that all fasteners are tight. Loose or missing fasteners shall be replaced with oversized

fasteners. Panels that are corroded or pitted thru and are considered unacceptable shall be replaced.

B. Metal Roof:

1. All loose rust, bitumen, or other foreign material shall be removed from the roof before applying asphalt

primer at the minimal rate of one and one-half (1-1/2) gallons per one hundred (100) square feet of area.

2. Deteriorated metal roofing shall be repaired or replaced as required and as recommended by the deck

manufacturer on a unit cost basis as approved by the Owner's representative.

3. The metal roof shall be of like kind, quality, gauge and configuration. The roof span shall not exceed that

recommended by a FM Global Bulletin 1-28.

4. If metal roof panel must be replaced:

a) Erect metal roofing as recommended by the SDI. Properly align and level on structural supports.

b) Allow minimum three inch (3") bearing when supported by structural steel and minimum six inch

(6") bearing when supported by masonry.

c) Care shall be exercised in the selection of electrodes and amperage to provide positive welds and to

prevent blowholes.

d) Weld metal shall penetrate all layers of roof material at end laps and side joints and shall have good

fusion to the supporting members.

e) Side lap fasteners shall be No. 12, self-drilling, self-tapping screws.

f) Install closure strips and angle flashings as required to close openings between deck and walls,

columns and openings.

g) Immediately after installation, touchup welds, burned areas and damaged spots with prime paint.

5. Expansion/control joints shall be installed so that no one area exceeds two hundred feet by two hundred

feet (200' x 200').

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SECTION 075420 - 17

3.04 CATEGORY II (NON-FRIABLE) ASBESTOS CONTAINING MATERIALS (ACM) REMOVAL

A. Owner and Contractor agree to exonerate, indemnify, defend, and hold harmless the roofing material

manufacturer from and against all claims, demands, lawsuits, damages, expenses and losses incurred by

Contractor's removal of asbestos-containing materials from Owner's building and work site. Contractor must

conduct its operations according to applicable requirements including but not limited to those established by:

1. Occupation Safety and Health Administration (OSHA).

2. Environmental Protection Agency (EPA).

3. Department of Transportation (DOT).

4. State or Local Air Pollution Control Authorities/Agencies.

5. State or Local Solid Waste or Hazardous Waste Authorities/Agencies.

6. State or Local Health Department(s).

7. State or Local Building Code Authorities.

8. Other federal, state or local agencies or authorities.

B. Contractor or Owner shall perform appropriate inspections, surveys and file timely notifications to proper

authorities prior to starting roof renovation or demolition activities. Inspectors, project planners, project

managers, contractors and workers involved in the roof project shall have appropriate training, licenses and

registrations. Contractor and Owner shall be responsible for determining and implementing regulatory

compliance activities, including but not limited to work practices, engineering controls, personal protection,

air monitoring, testing, hazard communication, material handling, record retention, and arranging for waste

disposal/handling.

C. Contractor must file a Uniform Hazardous Waste Manifest from proper landfill site for each load of asbestos

containing material removed. Copies must be sent to Owner and material manufacturer/specifier.

Transportation of waste shall be in accordance with applicable Department of Transportation (DOT)

requirements.

3.05 ROUGH CARPENTRY

A. All rough carpentry shall be in compliance with Section 06 10 53 Miscellaneous Carpentry.

B. Nailers shall be installed according to NRCA, Underwriters Laboratory, and IBC guidelines.

C. Wooden nailers shall be installed at Metal edges, drip edges, expansion joints, and on outside perimeter of

building.

D. Metal Edge and drip edge nailers shall be the same height as the new insulation being installed where

required.

E. Nailers shall be raised if necessary by anchoring an additional nailer of appropriate height to the existing

nailer if the existing nailer is not to be replaced.

F. Expansion joint nailers shall extend upward a minimum of eight inches (8") above finish roof height.

G. Where parapet wall exists, specified vertical wall shimming material shall be installed beginning at roof

height up to a minimum of twelve inches (12”) above finished roof surface, or as detailed, to provide

substrate for horizontal termination of roof to wall flashing system.

H. Any lumber or shimming required for attachment, or to make material flashing flush or level with offsets

and/or transitions, shall be incorporated in these specifications.

I. A layer of self-adhered membrane shall be placed between the existing metal roof and the

new nailers. IN NO CIRCUMSTANCE SHALL THE WOOD NAILERS BE ALLOWED TO

COME INTO DIRECT CONTACT WITH ANY METAL, WHETHER NEW OR EXISTING.

SECTION 075420


SECTION 075420 - 18

3.06 CANTS

A. Provide full 45 degree cant strips (no partials) at all intersections of vertical and horizontal surfaces, such as

walls, parapet walls, curbs, expansion joints, etc., and as recommended by membrane manufacturer.

B. Cants shall provide a four (4) inch rise above the roof’s surface.

C. Toe of cant shall be level with the surface to receive new roof membrane and in all cases anchored according

to NRCA, Underwriters Laboratory, and IBC guidelines.

D. Cant strips shall be installed at the intersection of the deck and all vertical surfaces.

A. If a wood cant is used where insulation exists, cant shall be toe nailed into treated wood nailer under cant the

same height as insulation.

3.07 APPLICATION OF FILLERS FOR FLUTES

A. Flutes of metal panels shall be filled with EPS board to match depth and configuration of flute prior to applying

specified roofing components. Hot wire cut sections of specified EPS insulation to fit between the existing

metal standing seam rib configurations so as to minimize any gaps between the insulation and the metal roof

panel. Prior to installation of the EPS fillers, the metal roof panels must be dry with all surface contaminants,

mastics, dirt and debris removed. Substrate repair shall be performed as required to minimum of NRCA

standards. If necessary, the EPS shall be tacked down with appropriate compatible adhesive to prevent any

slipping or sliding of the EPS Filler.

3.08 INSULATION

A. All insulation shall be approved in writing by the membrane manufacturer as to thickness, type, and

manufacturer. All insulation must be approved for the specific application, Underwriters Laboratory approved.

B. Manufacturer's Instructions: In regard to attachment, the manufacturer's instructions or specifications shall

determine the suitability for an application. Installation must meet ASCE 7 criteria and meet local governing

building codes.

C. Precautions: The surface of the insulation must not be ruptured due to overdriving of fasteners.

D. Thermal insulation boards shall be laid over the EPS Flute-Fill in rows perpendicular to slope with end joints

staggered and butted as close as possible. All joints shall be tight and at the roof perimeter and roof penetrations,

insulation shall be cut neatly and fitted to reduce openings to a minimum. All openings one-fourth inch (1/4") or

larger shall be filled with insulation.

E. No more insulation shall be installed than can be covered by the completed roof system by the end of the day or

the onset of inclement weather.

3.09 COVER BOARDS

A. Specified cover board shall be mechanically fastened to conform to ASCE 7 criteria for wind uplift as dictated

by wind zone applicable to location of project. Fasteners and fastening patterns shall be determined by building

height, location and geographical area of the United States. It is the contractor's responsibility to consult current

publications, literature, and bulletins of IBC and the manufacturer that are in effect at the time of this project for

fastening requirements. Boards shall be staggered and butted as close as possible with voids over one-fourth

inch (1/4") to be filled.

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SECTION 075420 - 19

B. Substrate board shall be laid with long dimension edges parallel to slope over the insulation board. Boards shall

be staggered and butted as close as possible with voids over ¼” to be filled.

C. Fasteners must penetrate the purlin a minimum of one inch (1"). Using a screw gun with a minimum of 1800

RPM, drive the fastener through the purlin until a slight depression is seen around the plate. Caution should be

taken not to overdrive the fastener causing stress plate surface to deflect more than one sixteenth inch (1/16").

3.10 APPLICATION OF UNDERLAYMENT BASE PLY SHEET

A. Cover Board shall be covered with one (1) layer of specified fiberglass ply sheet fully adhered.

B. All layers shall be applied using modified bitumen adhesive by notched squeegee or spray equipment at the

nominal rate of one and one-half to three (1.5 – 3) gallons per one hundred (100) square feet ± 20 percent.

Sheets shall be lapped four inches (4")on the sides and six inches (6") on ends. Sufficient adhesive shall be

applied at laps to result in a visible bead of adhesive at completed lap edge. End and side laps shall be rolled

with a weighted roller immediately after installation.

C. Apply adhesive no more than ten (10) feet ahead of each roll being embedded.

D. Broom each ply from the unmopped side before adhesive sets. Ensure complete and continuous seal and

contact between bitumen adhesive and base ply sheet without wrinkles, including ends, edges, laps,

fishmouths, or blisters. Broom width shall be thirty-four inches (34") minimum. Field of sheet, end laps and

side laps shall be rolled with a weighted roller immediately after installation. Avoid walking on plies until

adhesive has set.

E. Specified layers shall be applied in accordance with the manufacturer's recommendations and in accordance

with general practices as set forth by the NRCA Roofing Manual.

F. Base ply sheet shall not be left exposed to the elements for more than five (5) days.

G. If slope dictates, underlayment plies shall be installed using the strapped method going with the slope as

required by membrane manufacturer.

3.11 COLD PROCESS APPLICATION OF FLEECE BACKED MEMBRANE

A. Fully Adhered Application: Fully adhere membrane to acceptable substrate with substrate adhesive applied at

the rate of one and one-half to three (1.5 – 3) gallons per one hundred (100) square feet ± 20 percent or as

specified by the manufacturer.

1. The roof surface must be clean, dry and free of foreign material.

2. Position sheets as indicated on approved shop drawings. Membrane shall be applied shingle fashion,

perpendicular to the slope of the roof deck.

3. The membrane material shall be unrolled, cut into twelve feet to eighteen feet (12'-18') lengths, placed

upside down and allowed to “relax” prior to installation. Then re-roll to apply.

4. Install full width sheets, lapping four inches (4") on the sides and six inches (6") on ends. Stagger

adjacent end laps a minimum of eighteen inches (18") apart. Where installed over base sheet, stagger

sheet’s side and end laps from underlying plies.

5. Starting at the low point or the drains, apply the modified bitumen cold adhesive to the substrate in either

method as follows:

a. Pour the adhesive on the substrate and spread, using a serrated edged squeegee,

applied at the rate of 1-1/2 gal per square.

b. Spray, using equipment that will apply the adhesive at a rate equal to one and

one-half (1-1/2) gallons per square.

6. Apply the adhesive so that the substrate is coated in a pattern slightly larger than the first sheet being

applied.

SECTION 075420


SECTION 075420 - 20

7. Lap seams shall be done by lapping the selvedge edge over the non-selvedge edge of the previous roll

four inches (4"). End laps and selvage laps of the membrane being lapped shall be coated with adhesive

so that a visible bead of adhesive appears. Roll all laps with a steel roller to ensure proper adhesion.

8. LAP OPTION: The end laps and side laps may be hot-air welded. The hot-air welding method will

provide a watertight lap immediately and is preferable when inclement weather is threatening.

9. Carefully push into place from fold line to overlap, avoiding wrinkles and air pockets. Roll or broom

membrane flat.

10. Repeat procedure for other sheet half.

11. T-joint covers are required over all T-joints on installations of thermoplastic roofing membranes equal to

or greater than 60 mils in thickness. Center T-joint cover over the T-joint and completely hot air weld the

cover to the field membrane.

B. Welded Lap Seaming Procedure: Overlap membrane for attachment method specified and hot-air welded with

manufacturer's approved equipment.

1. All surfaces to be weld shall be clean, dry and free of foreign material.

2. All seams must then be probed daily (NO EXCEPTIONS).

C. Aesthetic Considerations: An aesthetically pleasing overall appearance of the finished roof application is a

standard requirement for this Project. Make necessary preparations, utilize manufacturer’s recommended

application techniques, apply the specified materials (i.e. primary and secondary components and accessories,

etc.) and exercise care in ensuring that the finished application is undamaged, free of cuts, tears, deformities, etc.

and acceptable to the Architect/Engineer/Consultant/Owner.

3.12 FLASHING - GENERAL

A. Flash all penetrations, metal edge systems, walls, curbs, expansion joints, drains as shown on details and

approved shop drawings with white reinforced PVC with Elvaloy® flashing membrane.

1. Use prefabricated flashing accessories or components such as sealant pockets, premolded vent/pipe

flashing.

2. Mechanically fasten flashing at terminations according to approved details.

3. Fastening membrane flashing through metal counterflashing is not acceptable.

B. Any lumber or shimming required for attachment or to make material flashing flush or level with offsets and/or

transitions shall be incorporated in the flashing specifications.

3.13 BASE FLASHING (APPROXIMATELY 8" IN HEIGHT MINIMUM)

A. Base flashings shall be installed using the flashing membrane, with length of run not to exceed twenty linear feet

(20').

B. Wooden nailers or curbs shall be installed at all edges and openings in the roof, mechanically fastened to the

deck.

C. Cant strips shall be installed at the intersection of the deck and all vertical surfaces.

D. The roofing field membrane shall extend up over and two inches (2") above the top of cant strips at all vertical

intersections or out to the roof's edge.

E. All existing substrates receiving flashing membrane shall be clean and primed with primer, prior to application

as required.

F. All flashings shall be mechanically fastened with a termination bar a maximum of six inches (6") on center, be a

maximum of eight inches (8") above finished roof height, extend a minimum of four inches (4") onto the field of

horizontal roof membrane, and not exceed twenty linear feet (20') of run in length.

G. After proper termination of the base flashing at a minimum eight-inch (8") height (or maximum eighteen inch

(18") height), a saw cut reglet with counterflashing shall be installed according to NRCA and SMACNA

guidelines.

SECTION 075420


SECTION 075420 - 21

H. All vertical flashing lap seams of the flashing membrane shall be hot-air welded.

I. All flashing membrane shall be adhered with flashing bonding adhesive to the vertical substrate and hot-air

welded to the field of roof membrane; hot-air weld vertical laps.

J. Flashing laps shall be minimum two inch (2") width, no maximum. Hot-air weld of flashing lap shall be

minimum two inch (2") width, no maximum.

K. Hot-Air Welding of Flashing Laps:

1. When using a hand-held hot-air welder, the seams should be pressed together using a hand-held roller.

The speed and temperature settings of the welding equipment can be affected by the weather conditions at

the site of application, therefore, these parameters should be set by trial and error using two (2) pieces of

the flashing membrane. Minimum width of hot-air weld two inches (2"), no maximum.

2. Lay the laps together and apply pressure to the welded seam to ensure full adhesion.

3. Allow the seams to set fully, and probe the entire length for voids. Reseam voids immediately with a

hot-air gun and roller.

L. All hot-air welded seams/laps shall be tested daily with a probe for integrity, no variance.

3.14 BACKNAILING/STRAPPING

A. On slopes greater than one inch (1") in twelve inches (12"), refer to NRCA and/or manufacturer's guidelines

for backnailing procedures and follow the more stringent guidelines for all specified materials. Provide

insulation stops parallel with edge of roof and at 8’-0” o.c. max up the slope of the roof.

3.15 PERIMETER FASTENING

A. Wood nailers are required for perimeters or drip edges. Field membrane and all plies shall be mechanically

fastened on the vertical face of nailer, twelve inches (12") on center maximum.

3.16 EDGING FLASHINGS

A. An NRCA-approved gravel stop/fascia system shall be installed in strict accordance with published instructions

to meet ES-1.

3.17 PIPING/CONDUIT

A. To support conduit or pipe sized up to Ø8" when height adjustment is needed use Model # SS1000A Adjustable

Pipe Support. 17" circular base with 12 ga. framing channel, 18"L, attached to 17" circular base using ½"

threaded rods, 12"L, with washers and nuts. Height of channel can be adjusted along the length of the ½"

threaded rods. Strut clamps are suggested to hold piping or conduit in place.

1. Manufacturers:

a) Advanced Support Products, Inc.

B. To support water or gas piping up to Ø8" or when a roller support with height adjustment is needed use Model

# SS1000RA Pipe Support with Adjustable Roller. 17" circular base with SBR heavy duty rubber roller

assembly attached to 17" circular base using ½" threaded rods, 12"L, with washers and nuts. Height of roller

assembly can be adjusted along the length of the ½" threaded rods.

1. Manufacturers:


SECTION 075420


SECTION 075420 - 22

C. To support multiple pipe runs, piping up to Ø12" when height adjustment or pipe suspension is needed use

Model # SS4000P, SS6000P or SS8000P Adjustable Support Bridge. SS4000P Adjustable Support Bridge is

made of four (4) 17" circular bases and 12ga. framing channel formed to make one “H” shaped support with

crossbar. SS6000P Adjustable support Bridge is made of six (6) 17" circular bases and 12ga. framing channel

formed to make two “H” shaped supports with crossbar. SS8000P Adjustable support Bridge is made of eight

(8) 17" circular bases and 12ga. framing channel formed to make three “H” shaped supports with crossbar.

Crossbar height is adjustable and offered in 18", 24", 36", and 48" lengths. Use Adjustable Support Bridge

with strut clamps or roller accessories or use optional hanger supports to suspend water or gas piping at various

heights. Optional hanger supports attached to support frame using ½" threaded rods. Hangers offer complete

height adjustments along the length of ½" threaded rods.

1. Manufacturers:


D. All gas lines, piping, and conduits shall be coated with industrial grade yellow pain

3.19 WALKWAY PADS

A. Fully adhere and heat weld walkway pads where shown on drawings or where required to provide protected

pathways from rooftop access points to mechanical or other equipment requiring rooftop maintenance.

3.20 MEMBRANE PROTECTION

A. Walk Way Pads: Install manufacturer's walk way pads continuously on each side of each

air-handling/mechanical unit on the roof in accordance with the manufacturer's recommended procedures.

B. Where equipment pads, wood sleepers, or walkway slabs are to be installed over the roofing membrane, an

additional layer of the roofing membrane shall be installed between the roofing membrane and the pad,

sleeper, or slab. Due caution shall be exercised to prevent roofing membrane damage during placement.

Where required, membrane shall be welded to field membrane to prevent slippage.

3.21 CLEANING

A. Clean exposed surfaces of excess cement, adhesive, sealants, mortar and paint associated with the new work.

B. Clean work area of excess roofing materials and installation debris daily.

C. Repair or replace defaced or disfigured finishes caused by the work.

3.22 MEMBRANE CLEANING

A. After all membrane has been installed, and just prior to turning over Owner, it shall be cleaned with a cleaning

agent compatible with the membrane to return the membrane to like new appearance.

3.23 PROTECTION

A. Protect all building surfaces against damage from roofing work.

B. Where traffic must continue over finished, installed roofing system, protect membrane, underlayment

accessories and finishes from damage.

3.28 OVERNIGHT SEAL

A. Provide temporary weather protection during interval between demolition and removal of existing

construction on exterior surfaces and installation of new construction to ensure that no water leakage or

damage occurs to structure or interior areas of existing building.

SECTION 075420


SECTION 075420 - 23

B. Installation shall be performed according to accepted roofing practice as outlined in the NRCA Roofing

Manual.

3.29 FIELD QUALITY CONTROL

A. Owner reserves the right to have finished Work inspected using infrared thermography or other appropriate,

non-destructive means to establish satisfactory conditions of completed Work.

B. Correct identified defects or irregularities. Cut out and repair membrane defects before end of each day.

3.30 MANUFACTURER'S FIELD SERVICES

A. Provide manufacturer's field services as required to qualify for specified warranty.

B. Roofing materials manufacturer's representative shall visit the site and observe the progress of the Work at a

rate of not less than one time per week.

1. Site visits shall be followed up by a written report of findings which is to be transmitted to the Owner's

Representative within five (5) days of the site visit.

3.31 PROTECTION OF FINISHED WORK

A. Protect finished Work under provision of application Section.

B. Where traffic must continue over finished roof installation, protect surfaces with minimum one-half inch

(1/2") wood fiberboard insulation, under five-eighth inch (5/8") thick plywood protective walkways ballasted

in place with sandbags or the like.

A. At all parapet and metal coping cap conditions, provide additional layer of self-adhered underlayment for

temporary protection over all parapet and coping caps conditions once roofing has been completed and prior

to installation of wood nailers and metal coping cap. Self-adhered underlayment is to cover cavity

conditions from roof side of parapet framing to outside of exterior finish to protect cavity from moisture

prior to completing parapet cap framing.

END OF SECTION 07 54 20

RFP #: 040821‐574 Re‐Roofing and Renovations of Portable Buildings

RFP ADDENDUM #4 Page 1 of 1

END OF ADDENDUM