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SECTION 04 20 00

UNIT MASONRY(Edited from DeCA September 2017 Design Criteria)

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Concrete masonry units (CMUs).2. Decorative concrete masonry units.3. Face brick.4. Precast concrete sills.5. Mortar and grout.6. Reinforcing steel.7. Masonry joint reinforcement.8. Ties and anchors.9. Miscellaneous masonry accessories.

1.2 REFERENCES

A. Specification for Masonry Structures: TMS 602-11 13/ACI 530.1-11 13/ASCE 6-11 13.

B. Building Code Requirements for Masonry Structures: TMS 402-11 13/ASCE 5-11 13ACI 530-11 13.

<Insert project name and location><Insert Submittal Date>UNIT MASONRY

04 20 00 - 1


1.3 DEFINITIONS

A. Reinforced Masonry: Masonry containing reinforcing steel in grouted cells.

B. CMU(s): Concrete masonry unit(s).

1.4 PERFORMANCE REQUIREMENTS

A. Unit Masonry Compressive Strength:

1. Provide units with minimum average net area compressive strengths as follows:

a. For Concrete Masonry Units: 1900 psi.b. For Face Brick: 3000 psi.

B. Determine net-area compressive strength (f'm) of masonry from average net-area compressive strengths of masonry units and mortar types (unit-strength method) according to Tables 1 and 2 in TMS 602-11/ACI 530.1-11/ASCE 6-11. Provide Type S mortar at all locations.

1.5 SUBMITTALS

A. Shop Drawings:

1. Reinforcing Steel: Detail bending and placement of unit masonry reinforcing bars. Comply with ACI 315, "Details and Detailing of Concrete Reinforcement" showing bar schedules, stirrup spacing, diagrams of bend control joints, framing or special conditions affecting the work. Provide 1/4 inch scale elevations of all walls with all openings and reinforcing shown. Coordinate with mason the type of grouting techniques to be used and provide bar lengths accordingly.

B. LEED Submittals:

1. Product Data for Credit MR 4: For products having recycled content, documentation indicating percentages by weight of postconsumer and preconsumer recycled content.

a. Include statement indicating costs for each product having recycled content.

2. Product Data for Credit MR 5: Regional materials, indicating percentages by weight of materials extracted, harvested or recovered, as well as manufactured within 500 miles of the Project.

a. Submit information form and data for each design mix

C. Material Certificates:

1. Include statements of material properties indicating compliance with requirements including compliance with standards and type designation within standards. Provide for each type and size of the following:

a. Masonry Units:


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1) Include material test reports substantiating compliance with requirements.

b. Face Brick:

1) Include material test reports substantiating compliance with requirements.2) Material rest reports efflorescence according to ASTM C 67.

c. Cementitious materials. Include brand, type, and name of manufacturer.d. Reinforcing bars.e. Joint reinforcement.f. Anchor, ties, and metal accessories.g. Aggregate certificates for mortar and grout.h. Preblended, dry mortar mixes. Include description, type, and proportions of

ingredients.

D. Samples for Verification:

1. For each type and color of the following,:

a. Decorative concrete masonry units.b. Face brick.c. Precast concrete trim.d. Pigmented mortar. Make samples using same sand and mortar ingredients to be

used on the Project.

E. Mix Designs:

1. For each type of mortar and grout. Include description of type and proportions of ingredients.

F. Statement of Compressive Strength of Masonry:

1. For each combination of masonry unit type and mortar type, provide statement of average net-area compressive strength of masonry units, mortar type, and resulting net-area compressive strength of masonry determined according to Tables 1 and 2 in TMS 602-11/ACI 530.1-11/ASCE 6-11.

G. Field Quality-Control Tests and Inspection Reports.

H. Special Inspection Reports.

I. Qualification Data: For Testing Agency and Special Inspectors

J. Submittal List:

Reference Submittal Item Quantity Action

1.5A Shop Drawings X R1.5B LEED Submittals X I 1.5C Material Certificates X R1.5D Samples for Verification X R1.5E Mix Designs X R


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1.5F Statement of Compressive Strength of Masonry X I1.5G Field Tests and Reports X R1.5H Special Inspection Reports X R

X Submit quantity specified in Division 01 Section Administrative Requirements.R Review each submittal, mark to indicate action taken, and return.I Submittal is for information or record purposes only. No action will be taken.

1.6 QUALITY ASSURANCE

A. Source Limitations for Masonry Units:

1. Obtain exposed masonry units of a uniform texture and color, or a uniform blend within the ranges accepted for these characteristics, through one source from a single manufacturer for each product required.

B. Source Limitations for Mortar Materials:

1. Obtain mortar ingredients of a uniform quality, including color for exposed masonry, from a single manufacturer for each cementitious component and from one source or producer for each aggregate.

C. Fire-Resistance Ratings:

1. Where indicated, provide materials and construction identical to those of assemblies with fire-resistance ratings determined per ASTM E 119 by a testing and inspecting agency, by equivalent concrete masonry thickness, or by other means, as acceptable to authorities having jurisdiction.

D. Mockup:

1. Build mockup to verify selections made under sample submittals and to demonstrate aesthetic effects and set quality standards for materials and execution.

2. Build mockup to include each type of typical exterior wall in sizes approximately 48 inches long by 48 inches high by full thickness, including face and backup wythes, precast concrete trim, and accessories.

a. Include a sealant-filled control joint.b. Include through-wall flashing installed approximately 16 inches down from top of

mockup, with a 12-inch length of flashing left exposed to view.c. Include metal studs, cavity backup masonry, insulation, veneer anchors, flashing,

and weep holes.d. Clean exposed faces of mockups with masonry cleaner as indicated.e. Protect accepted mockups from the elements with weather-resistant membrane.f. Approval of mockups is for color, texture, and blending of masonry units;

relationship of mortar and sealant colors to masonry unit colors; tooling of joints; and aesthetic qualities of workmanship.

E. Testing Agency Qualifications:


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1. Qualified according to ASTM C 1093 for testing indicated.

a. Personnel conducting field tests shall be qualified as ACI-certified Concrete Field Testing Technician, Grade I, or an equivalent certification program.

b. Personnel performing laboratory tests shall be ACI-certified Concrete Strength Testing Technician, Grade I, or an equivalent certification program. Testing agency laboratory supervisor shall be an ACI-certified Concrete Laboratory Testing Technician - Grade II, or an equivalent certification program.

F. Special Inspector Qualifications:

1. Special inspections for structural masonry shall be performed under the direct supervision of a Professional Structural Engineer registered in the state in which the project is located. The personnel performing the inspections shall be ICC-certified Structural Masonry Special Inspector or an equivalent certification program.

G. Preinstallation Conference:1. Conduct conference at Project site to comply with requirements in Division 01 Section

Administrative Requirements.a. Before submitting design mixtures, review concrete design mixture and examine

procedures for ensuring the quality of concrete materials. Require representatives of each entity directly concerned with cast-in-place concrete to attend, including the following:1) Contractor's superintendent.2) Independent testing agency responsible for concrete design mixtures.3) Ready-mix concrete manufacturer.4) Concrete subcontractor.5) Concrete floor finishing subcontractor.6) Polished concrete floor finish installer (attendance may be telephonically).7) Government’s Consultant.8) Concrete Special Inspector.9) Concrete Testing Agency Representative if different than the Special

Inspector.10) Government’s Authorized Technical Representative.

b. Review special inspection and testing and inspecting agency procedures for field quality control, concrete finishes and finishing, cold- and hot-weather concreting procedures, curing procedures, construction contraction and isolation joints, joint-filler strips, semirigid joint fillers, forms and form removal limitations, shoring and reshoring procedures, drainage course installation, vapor-retarder installation, anchor rod and anchorage device installation tolerances, steel reinforcement installation, floor and slab flatness and levelness measurement, concrete repair procedures, and concrete protection. Unacceptable floor slab finishes include blisters, cracking, crazing, curling, delamination, surface discoloration, dusting, efflorescence, popouts, scaling, and spalling. Sources available to the Contractor identifying causes, prevention, and repair of concrete slab surface defects are available from the Portland Cement Association and the National Ready Mix Concrete Association as identified in Paragraph 1.2 "References".

c. Review protection precautions relating to the polished concrete floor finish system as specified in Division 03 Section Polished Concrete Finishing including, but not limited to, the following:1) No satisfactory chemical or cleaning procedure is available to remove

petroleum stains from the concrete floor surface. Prevention is therefore essential.


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2) Diaper hydraulic powered equipment to avoid staining concrete.3) Do not park vehicles on concrete floor slab. Place drop cloths under vehicles

if it is necessary to park vehicles on concrete slab to complete work.4) Do not use pipe cutting machines on the concrete floor slab.5) To avoid rust staining do not place steel on concrete floor slab.6) Do not allow acids and acidic detergents to come into contact with concrete

floor slab.7) Inform all trades that the concrete floor slab must be protected at all times.8) All lifts on site must use canvas tire bags to prohibit screws and nails from

penetrating the rubber tires.9) Do not use slabs as casting bed for tilt-up concrete.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Storage:

1. Store masonry units on elevated platforms in a dry location. If units are not stored in an enclosed location, cover tops and sides of stacks with waterproof sheeting, securely tied. If units become wet, do not install until they are dry.

2. Store cementitious materials on elevated platforms, under cover, and in a dry location. Do not use cementitious materials that have become damp.

3. Store aggregates where grading and other required characteristics can be maintained and contamination avoided.

4. Store masonry accessories, including metal items, to prevent corrosion and accumulation of dirt and oil.

B. Preblended Dry Mortar Mix:

1. Deliver preblended, dry mortar mix in moisture-resistant containers designed for lifting and emptying into dispensing silo. Store preblended, dry mortar mix in delivery containers on elevated platforms, under cover, and in a dry location or in a metal dispensing silo with weatherproof cover.

1.8 PROJECT CONDITIONS

A. Protection of Masonry:

1. During construction, cover tops of walls, projections, and sills exposed to weather with waterproof sheeting at end of each day's work. Cover partially completed masonry when construction is not in progress.

2. Extend cover a minimum of 24 inches down both sides and hold cover securely in place.

B. Applied Loads:

1. Do not apply uniform floor or roof loads for at least 12 hours and concentrated loads for at least 3 days after building masonry walls.

C. Stain Prevention:


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1. Prevent grout, mortar, and soil from staining the face of masonry to be left exposed or painted. Immediately remove grout, mortar, and soil that come in contact with such masonry.

2. Protect base of walls from rain-splashed mud and from mortar splatter by spreading coverings on ground and over wall surface.

3. Protect sills, ledges, and projections from mortar droppings.4. Protect surfaces of window and door frames, as well as similar products with painted and

integral finishes, from mortar droppings.5. Turn scaffold boards near the wall on edge at the end of each day to prevent rain from

splashing mortar and dirt onto completed masonry.

D. Cold-Weather Requirements:

1. Do not use frozen materials or materials mixed or coated with ice or frost. Do not build on frozen substrates. Remove and replace unit masonry damaged by frost or by freezing conditions. Comply with cold-weather construction requirements contained in TMS 602-11/ACI 530.1-11/ASCE 6-11.

E. Cold-Weather Cleaning:

1. Use liquid cleaning methods only when air temperature is 40 deg F and above and will remain so until masonry has dried, but not less than 7 days after completing cleaning.

F. Hot-Weather Requirements

1. Comply with hot-weather construction requirements contained in TMS 602-11/ACI 530.1-11/ASCE 6-11.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Basis-of-Design Products: To establish the significant qualities related to type, function, dimension, in-service performance, physical properties, appearance, and other characteristics for purposes of evaluating comparable products of other manufacturers, a specific manufacturer's product is named and accompanied by the words "basis-of-design," including make or model number or other designation. Subject to compliance with requirements, provide either the named products or equal products.

2.2 MASONRY UNITS, GENERAL

A. Masonry Standard: Comply with TMS 602 / ACI 530.1 / ASCE 6, except as modified by requirements in the Contract Documents.

B. Defective Units: Referenced masonry unit standards may allow a certain percentage of units to exceed tolerances and to contain chips, cracks, or other defects exceeding limits stated in the standard. Do not uses units where such defects, including dimensions that vary from specified dimensions by more than stated tolerances, will be exposed in the completed Work or will impair the quality of completed masonry.


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2.3 CONCRETE MASONRY UNITS (CMUs)

A. Shapes:

1. Provide shapes indicated.2. Provide special shapes for lintels, corners, jambs, sashes, movement joints, headers,

bonding, and other special conditions.3. Provide square-edged units for outside corners, unless otherwise indicated.

B. Concrete Masonry Units: ASTM C 90.

1. Weight Classification: Normal Light weight, unless otherwise indicated.2. Standard face dimensions of:

a. Length: 16 inches nominal; 15-5/8 inches actual.b. Height: 8 inches nominal; 7-5/8 inches actual.

C. Decorative Concrete Masonry Units: ASTM C 90.

1. Weight Classification: Normal Light weight, unless otherwise indicated.2. Standard face dimensions of:

a. Length: 16 inches nominal; 15-5/8 inches actual.b. Height: 8 inches nominal; 7-5/8 inches actual.

3. Exposed Faces of Decorative Units: Normal-weight aggregate, split-face finish with integral special color and integral water repellent.

a. Basis-of Design Product: Northfield Block Co., Prairie stone Masonry Units.

4. Integral Water Repellent: Provide decorative units made with liquid polymeric, integral water-repellent admixture that does not reduce flexural bond strength. Units made with integral water repellent, when tested as a wall assembly made with mortar containing integral water-repellent manufacturer's mortar additive according to ASTM E 514, with test period extended to 24 hours, show no visible water or leaks on the back of the test specimen.

a. Basis-of Design Product: Dry-Block; W. R. Grace & Co., Construction Products Division.

2.4 BRICK

A. General:

1. Provide shapes indicated.2. For ends of sills and caps and for similar applications that would otherwise expose

unfinished brick surfaces, provide units without cores or frogs and with exposed surfaces finished.

3. Provide special shapes for applications where stretcher units cannot accommodate special conditions, including those at corners, movement joints, bond beams, sashes, and lintels.


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4. Provide special shapes for applications requiring brick of size, form, color, and texture on exposed surfaces that cannot be produced by sawing.

5. Provide special shapes for applications where shapes produced by sawing would result in sawed surfaces being exposed to view.

B. Face Brick:

1. ASTM C 216, Grade SW, Type [FBS] [FBX] [FBA].2. Initial Rate of Absorption: Less than 30 g/30 sq. in. per minute when tested per

ASTM C 67.3. Efflorescence: Provide brick that has been tested according to ASTM C 67 and is rated

"not effloresced."4. Size: As indicated.5. Color and Texture: As indicated.

2.5 PRECAST CONCRETE TRIM

A. Materials:

1. Portland Cement: ASTM C 150, Type I or Type III.

a. Color: As indicated.

2. Aggregates: ASTM C 33. Provide aggregates that are hard, durable, selected, and graded; free of material that causes staining or reacting with cement.

3. Pigments:

a. Nonfading, resistant to lime and other alkalis. Natural and synthetic iron oxides and chromium oxides, compounded for use in concrete mixes. Use only pigments with record of satisfactory performance in concrete.

b. For colored pigmented concrete use premixed colored materials of formulation required to produce color indicated, or if not indicated, as selected from manufacturer's standard formulations.

c. Basis-of-Design Products:

1) "Centurion Pigments", Centurion.2) "True Tone Mortar Colors", Davis Colors, A Subsidiary of Rockwood

Industries, Inc.3) "SGS Mortar Colors", Solomon Grind-Chem Services, Inc.

4. Reinforcing Bars: ASTM A 615, Grade 60, deformed.5. Connection Materials:

a. Stainless steel shapes: AISI Type 302/304.Anchor bolts: ASTM A 307, low carbon steel bolts, regular hexagon nuts and carbon steel washers; hot-dipped galvanized.

6. Air Entrainment Admixture: ASTM C260.7. Water: Clean and potable.

B. Concrete:


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1. Minimum 3000 psi, unless otherwise indicated, 28 day strength, air entrained in accordance with ACI 301.

C. Fabrication:

1. Use rigid molds, constructed to maintain precast unit uniform in shape, size, and finish.2. Reinforce sills and lintels with not less than two No. 4 bars.3. Reinforce sills and lintels for full length and a sufficient length beyond ends to allow

splicing or tying to building reinforcement, if any.4. Maintain 3/4 inch minimum clearance between reinforcement and unit face.5. Place and embed flashing reglets continuous and straight.6. Provide drip grooves on underside where units overhang walls.7. Provide sills with washes. Fabricate sills for windows and mullions in sections with head

joints at mullions and a 1/4 inch allowance for mortar joints. The ends, except at exposed surfaces, shall be roughened for bond.

8. Finish: Provide smooth, dense finish on exposed-to-view surfaces. Exposed surfaces shall be free of surface voids, spalls, cracks, and chipped and broken edges.

2.6 MASONRY LINTELS AND BOND BEAMS

A. Built-in-place horizontal grouted masonry element made from concrete masonry units with reinforcing bars placed as indicated and filled with coarse grout. Temporarily support built-in-place element until cured.

2.7 MORTAR AND GROUT MATERIALS

A. Portland Cement:

1. ASTM C 150, Type I or II, except Type III may be used for cold-weather construction. Provide natural color or white cement as required to produce mortar color indicated.

a. Alkali content shall not be more than 0.1 percent when tested according to ASTM C 114.

B. Hydrated Lime:

1. ASTM C 207, Type S.

C. Portland Cement-Lime Mix:

1. Packaged blend of portland cement complying with ASTM C 150, Type I or Type III, and hydrated lime complying with ASTM C 207. Mix proportions shall be per ASTM C270, proportion specification based on volume.

D. Aggregate for Mortar:

1. ASTM C 144; except for joints less than 1/4 inch thick, use aggregate graded with 100 percent passing the No. 16 sieve. For mortar that is exposed to view, use washed aggregate consisting of natural sand or crushed stone.


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E. Aggregate for Grout:

1. ASTM C 404.

F. Cold-Weather Admixture:

1. Nonchloride, noncorrosive, accelerating admixture complying with ASTM C 494, Type C, and recommended by the manufacturer for use in masonry mortar of composition indicated.

G. Water-Repellent Admixture:

1. Liquid water-repellent mortar admixture intended for use with decorative concrete masonry units, containing integral water repellent by same manufacturer.

2. Basis-of Design Product: Dry-Block; W. R. Grace & Co., Construction Products Division.

H. Water: Potable.

I. Colored Cement Product: Packaged blend made from portland cement and lime or mortar cement and mortar pigments, all complying with specified requirements, and containing no other ingredients.

1. Formulate blend as required to produce color indicated or, if not indicated, as selected from manufacturer's standard colors.

2. Premix cement and pigment at plant. Do not mix cement and pigment at job site.3. Pigments shall not exceed 10 percent of portland cement by weight.4. Pigments shall not exceed 5 percent of mortar cement by weight.5. Products:

a. Colored Portland Cement-Lime Mix:

1) Capital Materials Corporation; Riverton Portland Cement Lime Custom Color.

2) Holcim (US) Inc.; Rainbow Mortamix Custom Color Cement/Lime.3) Lafarge North America Inc.; Eaglebond Portland & Lime.4) Lehigh Cement Company; Lehigh Custom Color Portland/Lime Cement.

b. Colored Mortar Cement: Lafarge North America Inc.; Magnolia Superbond Mortar Cement.

6. Mortar Color:

a. Face Brick Units: As indicated.b. Concrete Masonry Units: Natural color unless otherwise indicated.

2.8 REINFORCEMENT

A. Uncoated Steel Reinforcing Bars:

1. ASTM A 615 or ASTM A996, Grade 60.


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B. Masonry Joint Reinforcement, General:

1. ASTM A 951.2. Interior Walls: Mill-galvanized, carbon steel wire.3. Exterior Walls (including backup wythes): Hot-dip galvanized, carbon steel wire.4. Wire Size for Side, Cross, and Veneer Rods: W1.7 or 0.148-inch (9 gage) diameter.5. Spacing of Cross Rods, Tabs, and Cross Ties: Not more than 16 inches o.c.6. Provide in lengths of not less than 10 feet, with prefabricated corner and tee units.

C. Masonry Joint Reinforcement for Single-Wythe Masonry:

1. Either Ladder or truss type with single pair of side rods.

D. Cavity Wall Masonry Joint Reinforcement for Multi-wythe Masonry:

1. Face brick veneer on concrete masonry-unit back-up:

a. Adjustable (two-piece) type, ladder design, with one side rod at each face shell of backing wythe and with separate ties (pintles) that extend into facing wythe. Ties have two hooks that engage eyes or slots in reinforcement and resist movement perpendicular to wall. Ties extend at least halfway through facing wythe but with at least 5/8-inch cover on outside face.

b. Wire size for veneer ties (pintles): W2.8 or 0.188-inch3/16 inch diameter.c. Basis-of-design product for ladder type with adjustable ties:

1) Hohman & Barnard, Inc; 270 Ladder Lox-All Adjustable Eye-Wire, including pintles.

2.9 TIES AND ANCHORS

A. Materials:

1. Provide ties and anchors specified in subsequent paragraphs that are made from materials that comply with subparagraphs below, unless otherwise indicated.

2. Interior Walls: Mill-Galvanized, Carbon-Steel Wire: ASTM A 82; with ASTM A 641/A 641M, Class 1 coating.

3. Exterior Walls: Hot-Dip Galvanized, Carbon-Steel Wire: ASTM A 82; with ASTM A 153/A 153M, Class B-2 coating.

4. Galvanized Steel Sheet: ASTM A 653/A 653M, Commercial Steel, G60 zinc coating.5. Steel Sheet, Galvanized after Fabrication: ASTM A 1008/A 1008M, Commercial Steel,

hot-dip galvanized after fabrication to comply with ASTM A 153/A 153M.6. Steel Plates, Shapes, and Bars: ASTM A 36/A 36M.

B. Wire Ties, General:

1. Unless otherwise indicated, size wire ties to extend at least halfway through veneer but with at least 5/8-inch cover on outside face. Outer ends of wires are bent 90 degrees and extend 2 inches parallel to face of veneer.

C. Adjustable Anchors for Connecting to Structure: Provide anchors that allow vertical or horizontal adjustment but resist tension and compression forces perpendicular to plane of wall.


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1. Anchor Section for Welding to Steel Frame:

a. Crimped 1/4-inch- diameter, wire.b. Tie Section for Steel Frame: Triangular-shaped wire tie, sized to extend within 1

inch of masonry face, made from 0.188-inch- diameter, wire.

D. Rigid Anchors:

1. Fabricate from steel bars 1-1/2 inches wide by 1/4 inch thick by 24 inches long, with ends turned up 2 inches or with cross pins, unless otherwise indicated. Connect T-intersections of CMU shear walls with rigid anchors in lieu of masonry bonding or bond beams, unless otherwise indicated.

2. Corrosion Protection: Hot-dip galvanized to comply with ASTM A 153/A 153M.

E. Adjustable Masonry-Veneer Anchors for Attachment to Cold-Formed Metal Framing:

1. General: Provide anchors that allow vertical adjustment but resist tension and compression forces perpendicular to plane of wall, for attachment over sheathing to metal studs, and as follows:

a. Structural Performance Characteristics: Capable of withstanding a 100-lbf load in both tension and compression without deforming or developing play in excess of 0.05 inch.

2. Screw-Attached, Masonry-Veneer Anchors: Units consisting of a wire tie and a metal anchor section.

a. Anchor Section: Sheet metal plate, 1-1/2 inches wide by 6 inches long, with screw holes top and bottom and with raised rib-stiffened strap stamped into center to provide a slot between strap and plate for inserting wire tie.

b. Fabricate sheet metal anchor sections and other sheet metal parts from 0.067-inch-nominal 14 gage thick, steel sheet, galvanized after fabrication.

c. Fabricate Triangular wire ties from 0.187-inch-diameter, hot-dip galvanized steel wire.

d. Basis-of-Design Product: Hohman & Barnard, Inc.: DW10-HS Anchor Plate with VBT – Vee Byna Ties.

3. Polymer-Coated, Steel Drill Screws for Steel Studs: ASTM C 954 except manufactured with hex washer head and neoprene washer, No. 10 diameter by length required to penetrate steel stud flange with not less than 3 exposed threads, and with organic polymer coating with salt-spray resistance to red rust of more than 800 hours per ASTM B 117.

a. Basis-of-Design Product: Hohmann & Barnard Tek Screws; TEK-PK 10 x length.

2.10 MISCELLANEOUS ANCHORS

A. Anchor Bolts:


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1. Headed or L-shaped steel bolts complying with ASTM A 307, Grade A; with ASTM A 563 hex nuts and, where indicated, flat washers; hot-dip galvanized to comply with ASTM A 153/A 153M, Class C; of dimensions indicated.

B. Post-Installed Anchors:

1. Provide chemical or torque-controlled expansion anchors, with capability to sustain, without failure, a load equal to six times the load imposed when installed in solid or grouted unit masonry and equal to four times the load imposed when installed in concrete, as determined by testing per ASTM E 488 conducted by a qualified independent testing agency.

2. Corrosion Protection: Carbon-steel components zinc plated to comply with ASTM B 633, Class Fe/Zn 5 (5 microns) for Class SC 1 service condition (mild).

2.11 EMBEDDED FLASHING MATERIALS

A. Flexible Flashing: For flashing not exposed to the exterior, use one of the following, unless otherwise indicated:

1. Copper-Laminated Flashing: 5-oz./sq. ft. copper sheet bonded with asphalt between 2 layers of glass-fiber cloth. Use only where flashing is fully concealed in masonry.

a. Available Products:

1) Advanced Building Products Inc.; Copper Fabric Flashing.2) AFCO Products Inc.; Copper Fabric.3) Hohmann & Barnard, Inc.; H & B C-Fab Flashing.4) Phoenix Building Products; Type FCC-Fabric Covered Copper.5) Polytite Manufacturing Corp.; Copper Fabric Flashing.6) Sandell Manufacturing Co., Inc.; Copper Fabric Flashing.7) York Manufacturing, Inc.; York Copper Fabric Flashing.

2. Rubberized-Asphalt Flashing: Composite flashing product consisting of a pliable, adhesive rubberized-asphalt compound, bonded to a high-density, cross-laminated polyethylene film to produce an overall thickness of not less than 0.030 inch.


1) Advanced Building Products Inc.; Peel-N-Seal.2) Carlisle Coatings & Waterproofing; CCW-705-TWF Thru-Wall Flashing.3) Dayton Superior Corporation, Dur-O-Wal Division; Dur-O-Barrier-44.4) Grace Construction Products, a unit of W. R. Grace & Co. - Conn.; Perm-A-

Barrier Wall Flashing.5) Heckmann Building Products Inc.; No. 82 Rubberized-Asphalt Thru-Wall

Flashing.6) Hohmann & Barnard, Inc.; Textroflash.7) Polyguard Products, Inc.; Polyguard 300.8) Polytite Manufacturing Corp.; Poly-Barrier Self-Adhering Wall Flashing.9) Williams Products, Inc.; Everlastic MF-40.

b. Accessories: Provide preformed corners, end dams, other special shapes, and seaming materials produced by flashing manufacturer.


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3. Elastomeric Thermoplastic Flashing: Composite flashing product consisting of a polyester-reinforced ethylene interpolymer alloy as follows:

a. Monolithic Sheet: Elastomeric thermoplastic flashing, 0.040 inch thick.b. Self-Adhesive Sheet: Elastomeric thermoplastic flashing, 0.025 inch thick, with a

0.015-inch- thick coating of rubberized-asphalt adhesive.c. Self-Adhesive Sheet with Drip Edge: Elastomeric thermoplastic flashing, 0.025

inch thick, with a 0.015-inch- thick coating of rubberized-asphalt adhesive. Where flashing extends to face of masonry, rubberized-asphalt coating is held back approximately 1-1/2 inches from edge.

d. Accessories: Provide preformed corners, end dams, other special shapes, and seaming materials produced by flashing manufacturer.

e. Available Products:

1) Hyload, Inc.; Hyload Cloaked Flashing System.

4. EPDM Flashing: Sheet flashing product made from ethylene-propylene-diene terpolymer, complying with ASTM D 4637, 0.040 inch thick.


1) Carlisle Coatings & Waterproofing; Pre-Kleened EPDM Thru-Wall Flashing.2) Firestone Building Products; FlashGuard.3) Heckmann Building Products Inc.; No. 81 EPDM Thru-Wall Flashing.

5. Termination Bars for Flexible Flashing ( where flashing extends up face of interior cavity on inner wythe or on sheathing : Stainless steel bar 1/8” x 1” .

B. Metal Drip Edge:

1. Unless detailed otherwise, provide Metal Drip Edge below edge of flexible flashing where flexible flashing terminates at or within ½” of exterior face of masonry wall.

2. Stainless Steel: ASTM A 240/A 240M, Type 304, 0.016 inch thick.3. Fabricate continuous flashings in sections 96 inches long minimum, but not exceeding 12

feet. Provide splice plates at joints of formed, smooth metal flashing.4. Extend at least 3 inches into wall and 1/2 inch out from wall, with outer edge bent down

30 degrees and hemmed.

C. Adhesives, Primers, and Seam Tapes for Flashings: Flashing manufacturer's standard products or products recommended by flashing manufacturer for bonding flashing sheets to each other and to substrates.

2.12 MISCELLANEOUS MASONRY ACCESSORIES

A. Compressible Filler:

1. Premolded filler strips complying with ASTM D 1056, Grade 2A1; compressible up to 35 percent; of width and thickness indicated; formulated from neoprene, urethane, or PVC.

B. Preformed Control-Joint Gaskets:


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1. Made from styrene-butadiene-rubber compound, complying with ASTM D 2000, Designation M2AA-805 or PVC, complying with ASTM D 2287, Type PVC-65406 and designed to fit standard sash block and to maintain lateral stability in masonry wall; size and configuration as indicated.

C. Bond-Breaker Strips:

1. Asphalt-saturated, organic roofing felt complying with ASTM D 226, Type I (No. 15 asphalt felt).

D. Reinforcing Bar Positioners:

1. Wire units designed to fit into mortar bed joints spanning masonry unit cells with loops for holding reinforcing bars in center of cells. Units are formed from 0.142-inch steel wire, hot-dip galvanized after fabrication. Provide units with either two loops or four loops as needed for number of bars indicated.

2. Basis-of-Design Product: Hohmann & Barnard; RB Rebar Positioner; RB-Twin Rebar Positioner; SPYRA-LOX Rebar Lap Joint.

E. Weeps and masonry veneer ( top of wall ) vents:

1. Cellular Plastic Weep/Vent: One-piece, flexible extrusion made from UV-resistant polypropylene copolymer, full height and width of head joint and depth 1/8 inch less than depth of outer wythe, in color selected from manufacturer's standard to match adjacent masonry grout or as otherwise indicated. Basis-of-design product for weep vent:

a. Hohmann & Barnard QV Quadro-Vent .

F. [Where indicated on drawings, provide Drainage Material: Free-draining mesh, made from polymer strands that will not degrade within the wall cavity.

1. Strips, full depth of cavity (to face of rigid insulation – if insulation is present); 10” high with dovetail-shaped notches designed to catch mortar droppings and prevent mortar droppings from clogging weeps.

2. Basis of design for material : Hohmann & Barnard ; Mortar Trap.

2.13 CAVITY-WALL INSULATION

A. Extruded-Polystyrene Board Insulation:

1. ASTM C 578, Type IV, closed-cell product extruded with an integral skin.

B. Adhesive:

1. Type recommended by insulation board manufacturer for application indicated.


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2.14 MASONRY CLEANERS

A. Cleaning Solutions:

1. Not harmful to masonry work or adjacent materials; expressly approved for intended use by manufacturers of masonry units and mortar being cleaned.

2.15 MORTAR AND GROUT MIXES

A. General:

1. Do not use admixtures, including pigments, air-entraining agents, accelerators, retarders, water-repellent agents, antifreeze compounds, or other admixtures, unless otherwise indicated.

2. Do not use calcium chloride in mortar or grout.3. Limit cementitious materials in mortar for exterior and reinforced masonry to portland

cement, mortar cement, and lime.

B. Preblended, Dry Mortar Mix:

1. Furnish dry mortar ingredients in form of a preblended mix. Measure quantities by weight to ensure accurate proportions, and thoroughly blend ingredients before delivering to Project site.

C. Mortar for Unit Masonry:

1. Comply with ASTM C 270, Proportion Specification. Provide Type S mortar unless another type is indicated or needed to provide required compressive strength of masonry.

D. Pigmented Mortar:

1. Use colored cement product.

E. Grout for Unit Masonry:

1. Comply with ASTM C 476, delete reference to mix proportion per compressive strength in Paragraph 5.2 of ASTM C476.

2. Use grout of type indicated or, if not otherwise indicated, of type (fine or coarse) that will comply with Table 1.20.1 in TMS 602-11/ACI 530.1-11/ASCE 6-11for dimensions of grout spaces and pour height.

3. Provide grout with a slump of 9 to 11 inches as measured according to ASTM C 143/C 143M.

PART 3 - EXECUTION

3.1 EXAMINATION

A. General:


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1. Examine conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of work.

2. Verify that foundations are within tolerances specified.3. Verify that reinforcing dowels are properly placed.4. Verify that substrates are free of substances that impair mortar bond.5. Before installation, examine rough-in and built-in construction for piping systems to verify

actual locations of piping connections.6. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 INSTALLATION, GENERAL

A. Thickness:

1. Build masonry construction to full thickness shown. Build single-wythe walls to actual widths of masonry units, using units of widths indicated.

B. Chases and Recesses:

1. Build chases and recesses to accommodate items specified in this and other Sections.

C. Openings For Equipment:

1. Leave openings for equipment to be installed before completing masonry. After installing equipment, complete masonry to match the construction immediately adjacent to opening.

D. Cutting of Units:

1. Use full-size units without cutting if possible. If cutting is required to provide a continuous pattern or to fit adjoining construction, cut units with motor-driven saws; provide clean, sharp, unchipped edges. Allow units to dry before laying unless wetting of units is specified. Install cut units with cut surfaces and, where possible, cut edges concealed.

E. Blending of Colors and Textures:

1. Select and arrange units for exposed unit masonry to produce a uniform blend of colors and textures.

2. Mix units from several pallets or cubes as they are placed.3. Face Brick Color Range: Lay face brick with color range evenly distributed throughout.

Do not install brick so that colors are concentrated in wall areas that result in an uneven, blotchy color distribution.

F. Wetting of Face Brick:

1. Wet brick before laying if initial rate of absorption exceeds 30 g/30 sq. in. per minute when tested per ASTM C 67. Allow units to absorb water so they are damp but not wet at time of laying.

G. Retempering of Colored Mortar:


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1. Do not retemper colored mortar unless samples of retempered colored mortar have been made and no significant change in appearance of the color of the mortar is evident, as acceptable to the Contracting Officer.

H. Tolerances:

1. Comply with construction tolerances in TMS 602-11/ACI 530.1-11/ASCE 6-11 and with the following:

a. For conspicuous vertical lines, such as external corners, door jambs, reveals, and control joints, do not vary from plumb by more than 1/8 inch in 10 feet, 1/4 inch in 20 feet, or 1/2 inch maximum.

b. For conspicuous horizontal lines do not vary from level by more than 1/8 inch in 10 feet, 1/4 inch in 20 feet, or 1/2 inch maximum.

c. For exposed bed joints, do not vary from thickness indicated by more than plus or minus 1/8 inch, with a maximum thickness limited to 1/2 inch. Do not vary from bed-joint thickness of adjacent courses by more than 1/8 inch.

d. For faces of adjacent exposed masonry units, do not vary from flush alignment by more than 1/16 inch.

3.3 LAYING MASONRY WALLS

A. General:

1. Lay out walls in advance for accurate spacing of surface bond patterns with uniform joint thicknesses and for accurate location of openings, movement-type joints, returns, and offsets. Avoid using less-than-half-size units, particularly at corners, jambs, and, where possible, at other locations.

B. Bond Pattern for Exposed Masonry:

1. Unless otherwise indicated, lay exposed masonry in running bond; do not use units with less than nominal 4-inch horizontal face dimensions at corners or jambs.

C. Concealed Masonry:

1. Lay concealed masonry with all units in a wythe in running bond or bonded by lapping not less than 4-inches. Bond and interlock each course of each wythe at corners. Do not use units with less than nominal 4-inch horizontal face dimensions at corners or jambs.

D. Stopping and Resuming Work:

1. Stop work by racking back units in each course from those in course below; do not tooth. When resuming work, clean masonry surfaces that are to receive mortar, remove loose masonry units and mortar, and wet brick if required before laying fresh masonry.

E. Built-in Work:

1. As construction progresses, build in items specified in this and other Sections. Fill in solidly with masonry around built-in items.

F. Steel Frames:


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1. Fill space between steel frames and masonry solidly with mortar, unless otherwise indicated.

2. If additives are used in mortar, field coat steel door frames in contact with mortar with a bituminous compound to prevent corrosion.

G. Built-In Items:

1. Where built-in items are to be embedded in cores of hollow masonry units, place a layer of metal lath, wire mesh, or plastic mesh in the joint below and rod mortar or grout into core.

H. Grouting of CMU’s:

1. Fill cores in hollow concrete masonry units with grout 24 inches under bearing plates, beams, lintels, posts, and similar items, unless otherwise indicated.

I. Interior Partitions:

1. Build non-load-bearing interior partitions full height of story to underside of solid floor or roof structure above, unless otherwise indicated.

2. Install compressible filler in joint between top of partition and underside of structure above.

3. At fire-rated partitions, treat joint between top of partition and underside of structure above to comply with Division 07 Section Firestopping.

3.4 MORTAR BEDDING AND JOINTING

A. Lay Hollow Masonry Units As Follows:

1. With face shells fully bedded in mortar and with head joints of depth equal to bed joints.2. With webs fully bedded in mortar in all courses of piers, columns, and pilasters.3. With webs fully bedded in mortar in grouted masonry, including starting course on

footings.4. With entire units, including areas under cells, fully bedded in mortar at starting course on

footings where cells are not grouted.5. Fully bed units and fill cells with mortar at anchors and ties as needed to fully embed

anchors and ties in mortar.

B. Solid Masonry Units:

1. Lay solid masonry units with completely filled bed and head joints; butter ends with sufficient mortar to fill head joints and shove into place. Do not deeply furrow bed joints or slush head joints.

C. Precast Concrete Trim:

1. Set precast concrete trim units in full bed of mortar with full vertical joints. Fill dowel, anchor, and similar holes.

D. Joints:


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1. Tool exposed joints slightly concave when thumbprint hard, using a jointer larger than joint thickness, unless otherwise indicated.

2. Rake out mortar in preparation for application of sealants where sealants are indicated in mortar joints.

3.5 COMPOSITE MASONRY

E. Corners: Provide interlocking masonry unit bond in each wythe and course at corners, unless otherwise indicated.

1. Provide continuity with masonry joint reinforcement at corners by using prefabricated L-shaped units as well as masonry bonding.

2. Intersecting and Abutting Walls: Unless vertical expansion or control joints are shown at juncture, bond walls together as follows:

a. General:

1) Provide continuity with masonry joint reinforcement by using prefabricated T-shaped joint reinforcement units spaced at a maximum vertical distance of 16 inches and extending at least 30 inches in each direction at the intersection.

2) Provide rigid metal anchors not more than 48 inches o.c. If used with hollow masonry units, embed ends in mortar-filled cores.

3) Connect T-intersections of CMU shear walls with rigid anchors in lieu of masonry bonding or bond beams, unless otherwise indicated.

b. Provide joint reinforcement spaced at a maximum vertical distance of 16 inches.

3.6 CAVITY WALLS

A. Bond:

1. Face brick veneer on concrete masonry-unit back-up. Bond wythes of cavity walls together using cavity wall joint reinforcement.

a. Adjustable (two-piece) type, ladder design, with one side rod at each face shell of backing wythe and with separate ties that extend into facing wythe. Provide ties installed in horizontal joints, but not less than one metal tie for 1.77 sq. ft. of wall area spaced not to exceed 16 inches o.c. horizontally and 16 inches o.c. vertically. Provide additional ties around openings larger than 16 inches in either dimension. Place anchors within 12 inches of openings.

B. Cavities:

1. Keep cavities clean of mortar droppings and other materials during construction. Bevel beds away from cavity, to minimize mortar protrusions into cavity. Do not attempt to trowel or remove mortar fins protruding into cavity.

C. Installing Cavity-Wall Insulation:


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1. Place small dabs of adhesive, spaced approximately 12 inches o.c. both ways, on inside face of insulation boards, or attach with plastic fasteners designed for this purpose. Fit courses of insulation between wall ties and other confining obstructions in cavity, with edges butted tightly both ways. Press units firmly against inside wythe of masonry or other construction as shown.

2. Fill cracks and open gaps in insulation with crack sealer compatible with insulation and masonry.

3.7 MASONRY JOINT REINFORCEMENT

A. General:

1. Install entire length of longitudinal side rods in mortar with a minimum cover of 5/8 inch on either side of walls, 1/2 inch elsewhere. Lap reinforcement a minimum of 6 inches.

2. Space reinforcement not more than 16 inches o.c.3. Provide reinforcement not more than 8 inches above and below wall openings and

extending 12 inches beyond openings.

a. Reinforcement above is in addition to continuous reinforcement.

4. Interrupt joint reinforcement at control joints.5. Provide continuity at wall intersections by using prefabricated T-shaped units.6. Provide continuity at corners by using prefabricated L-shaped units.

3.8 ANCHORING MASONRY TO STRUCTURAL MEMBERS

A. Anchoring to Structural Members:

1. Anchor masonry to structural members where masonry abuts or faces structural members to comply with the following:

a. Anchor masonry to structural members with anchors embedded in masonry joints and attached to structure.

b. Space anchors as indicated, but not more than 16 inches o.c. vertically.

3.9 ANCHORING MASONRY VENEERS TO COLD-FORMED METAL FRAMING

A. Anchor Masonry Veneers To Wall Framing With Adjustable Masonry-Veneer Anchors:

1. Fasten screw-attached anchors through sheathing to wall framing with metal fasteners of type indicated. Use two fasteners unless anchor design only uses one fastener.

2. Insert anchor sections in metal studs as sheathing is installed. Provide one anchor at each stud in each horizontal joint between sheathing boards.

3. Locate anchor sections to allow maximum vertical differential movement of ties up and down.

4. Space anchors not more than 16 inches o.c. vertically and 16 inches o.c. horizontally with not less than 1 anchor for each 1.77 sq. ft. of wall area. Install additional anchors within 12 inches of openings and at intervals, not exceeding, 16 inches around perimeter.


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3.10 CONTROL AND EXPANSION JOINTS

A. General:

1. Install control and expansion joint materials in unit masonry as masonry progresses. Do not allow materials to span control and expansion joints without provision to allow for in-plane wall or partition movement. If locations of vertical expansion and control joints are not shown, locate as follows:

a. In concrete masonry unit single-wythe walls and in the CMU wythe of cavity walls space control joints at 1.5 times the wall height or 25 feet on center, whichever is lesser, unless noted on Drawings.

b. In the brick wythe of cavity walls and brick veneer walls, where the brick is made from clay or shale: 30 feet on center, maximum.

c. Provide vertical joints at one side of wall openings 6 feet or less in width and at both sides of wall openings over 6 feet in width.

d. Provide vertical joints at abutment of walls and columns, where wall thickness changes, at chases and recesses in walls, at pilasters, at return or reverse corners of walls, approximately 4 feet from corners, and where wall height changes.

e. Provide movement joints in accordance with the foregoing if locations shown on Drawings exceed the preceding specified movement joint spacings.

f. Verify locations of field-located movement joints and revised movement joint locations with Contracting Officer before proceeding.

2. Form control joints in concrete masonry using one of the following methods unless otherwise indicated:

a. Install preformed control-joint gaskets designed to fit standard sash block.b. Install interlocking units designed for control joints. Install bond-breaker strips at

joint. Keep head joints free and clear of mortar or rake out joint for application of sealant.

3. Form expansion joints in brick made from clay or shale as follows unless otherwise indicated:

a. Build flanges of metal expansion strips into masonry. Lap each joint 4 inches in direction of water flow. Seal joints below grade and at junctures with horizontal expansion joints if any.

b. Build flanges of factory-fabricated, expansion-joint units into masonry.c. Build in compressible joint fillers where indicated.d. Form open joint full depth of brick wythe and of width indicated, but not less than 1

inch for installation of sealant and backer rod specified in Division 07 Section Joint Sealants.

3.11 LINTELS

A. Steel Lintels:

1. Provide steel lintels where indicated and where openings of more than 12 inches for brick size units and 24 inches for block size units are shown without structural steel or other supporting lintels.


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2. Steel Lintel Angles Per Masonry Wythe: 3-1/2 inches by 3-1/2 inches by 1/4 inch. Verify size of angles with Contracting Officer before proceeding.

3. Provide minimum bearing of 8 inches at each jamb, unless otherwise indicated.

B. Masonry Lintels:

1. In concrete masonry walls provide masonry lintels where shown and where openings of more than 8 inches for brick-size units and 16 inches for block-size units are shown without structural steel or other supporting lintels. Match color and texture of adjacent units.

2. Reinforcement Bars: Two No. 5 steel reinforcement bars unless otherwise indicated. Verify size of reinforcement bars with Contracting Officer before proceeding.

3.12 FLASHING, WEEPS, AND CAVITY DRAINAGE

A. General:

1. Install embedded flashing and weep holes in masonry at shelf angles, lintels, ledges, other obstructions to downward flow of water in wall, and where indicated.

B. Flashing and Metal Edge Drip Installation:

1. Prepare masonry surfaces so they are smooth and free from projections that could puncture flashing. Where flashing is within mortar joint, place through-wall flashing on sloping bed of mortar and cover with mortar. Before covering with mortar, seal penetrations in flashing with adhesive, sealant, or tape as recommended by flashing manufacturer.

a. Install metal drip edge beneath concealed flexible flashing at exterior face of wall. Adhere flashing to top of metal.

b. Lap ends of flashing a minimum of 6 inches. Seal flashing lap with mastic or adhesive compatible with flashing material if flashing is not self-adhering.

2. Masonry Cavity Walls:

a. Install concealed flexible flashing 1/2 inch back from exterior face of outer wythe of masonry ( above metal drip edge ) through outer wythe, across air space and turn up a minimum of [8 inches] [16 inches] where cavity mortar mesh material is installed .

1) Secure upper edge of flashing with termination bar. Exception: Upper edge of flashing may be tucked into cmu bed joint if there is no horizontal joint reinforcement in cmu bed joint

3. Masonry-veneer Cavity Walls:

a. Install concealed flexible flashing 1/2 inch back from exterior face of veneer (above metal drip edge ) through veneer, across air space behind veneer, and up face of sheathing at least [8 inches] [16 inches] where cavity mortar mesh material is installed; Lap building paper over flashing 4 inches.


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4. Below wall openings in masonry, extend flexible flashing under sills 1/2 inch back from exterior face of masonry, over metal drip edge. At inside face of cavity wall, turn up flashing as specified for type of wall construction.

5. At lintels install metal drip edge beneath flashing at exterior face of wall in continuous bed of adhesive applied directly to steel lintels. Turn up flashing over lintel and as specified for type of wall construction.

a. Lay masonry unit directly on flashing over steel lintels.

6. Install flashing and metal drip edge continuous around corners and jogs in walls.7. At heads and sills, extend flashing 6 inches at ends and turn up not less than 2 inches to

form end dams.8. Seal end dams to end of masonry unit.9. Install end dams wherever flashing meets non-masonry wall components. Seal end dams

to non-masonry wall components.10. Seal underside of metal drip edge with elastomeric sealant complying with requirements

in Division 07 Section Joint Sealants for application indicated.

C. Weeps and Vents:

1. Install weeps in head joints in exterior wythes of first course of masonry immediately above embedded flashing and as follows:

a. Use specified weep products to form weeps b. Space weep holes 24 inches o.c. max.

2. Install vents ( open head joints with specified cellular plastic weep vents) in head joints in exterior wythes of the second masonry course from the top of wall and in second masonry course below lintels or as otherwise indicated on drawings.

a. Use specified cellular plastic weep vent to form vents.b. Use wicking material to form weep holes above flashing under brick sills. Turn

wicking down at lip of sill to be as inconspicuous as possible.c. Space vents at the same horizontal spacing as the weeps and roughly centered

horizontally between the weeps – per BIA recommendations.d. Install per vent manufacturer recommendations.

D. Cavity Drainage:

1. Place specified cavity drainage material at bottom of cavity per manufacturer recommendations.

3.13 REINFORCED UNIT MASONRY INSTALLATION

A. Basic Requirement:

1. Reinforce concrete masonry unit cores with reinforcement bars and grout.

B. Temporary Formwork and Shores:


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1. Construct formwork and shores as needed to support reinforced masonry elements during construction.

2. Construct formwork to provide shape, line, and dimensions of completed masonry as indicated. Make forms sufficiently tight to prevent leakage of mortar and grout. Brace, tie, and support forms to maintain position and shape during construction and curing of reinforced masonry.

3. Do not remove forms and shores until reinforced masonry members have hardened sufficiently to carry their own weight and other temporary loads that may be placed on them during construction.

C. Placing Reinforcement:

1. Comply with requirements in TMS 602-11/ACI 530.1-11/ASCE 6-11.2. Lap and tie reinforcement to bars extending from concrete foundation.3. Installation of reinforcement bars: As indicated on drawings.

D. Keying:

1. To form key for subsequent lift, terminate grout lift 1-1/2 inches below top course.

E. Grouting:

1. Do not place grout until entire height of masonry to be grouted has attained enough strength to resist grout pressure.

2. Comply with requirements in TMS 602-11/ACI 530.1-11/ASCE 6-11 for cleanouts and for grout placement, including minimum grout space and maximum pour height.

3. Limit height of vertical grout pours to not more than 60 inches.4. Consolidate pours by mechanical vibration and reconsolidate by mechanical vibration

after initial water loss and settlement has occurred.

3.14 BOND BEAMS

A. Use specially formed U-shaped bond beam units. Place horizontal reinforcement in bond beams; lap at corners and intersections. Fill bond beam course with grout or concrete as indicated.

3.15 FIELD QUALITY CONTROL

A. Testing and Inspections:

1. The Contractor shall employ a qualified testing laboratory to perform tests.2. The Contractor shall employ a structural masonry special inspector to perform

inspections.

a. Inspections:

1) The inspection program by the Special Inspector shall comply with TMS 402/ACI 530/ASCE 5 and TMS 602/ACI 530.1/ASCE 6 Quality Assurance Program requirements.

b. Sampling and Testing Mortar, Grout, and CMU:


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1) Mortar and grout samples shall be secured from field mixed materials. Do not use retempered mortar.

2) Concrete Masonry Unit Testing: Units shall be tested prior to construction and test unit during construction for each 5,000 sq. ft. of wall. The testing shall be per ASTM C140 and show compliance with Table 2 of TMS 602/ACI 530.1/ASCE 6.

3) Compressive Strength Tests: ASTM C780 for mortar and ASTM C1019 for grout; one set (four molds) for each material the first day it is used and averaging every third day that the material is used thereafter, but not less than one set for each 5,000 sq. ft. of wall for each material; one specimen for each material tested at seven days, two specimens tested at 28 days, and one specimen retained in reserve for later testing if required.

a) When acceptable to the Contracting Officer, strength level of mortar and grout will be considered satisfactory if average 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 300 psi.

4) Test results will be reported in writing on same day that tests are made. Reports of compressive strength tests will contain the project identification name and number, date of material placement, name of testing service, location of material in structure, design compressive strength at 28 days, material mix proportions and materials; compressive breaking strength for both seven-day and 28-day tests.

5) If testing service reports and inspections indicated specified material strengths and other characteristics have not been attained in the structure, the testing service will make additional tests of in-place mortar or grout, as directed by the Contracting Officer. Contractor shall pay for such tests conducted, and any other additional testing as may be required, when unacceptable material is verified.

3. Complete cost of retesting and/or reinspection shall be the Contractor’s responsibility.

3.16 REPAIRING, POINTING, AND CLEANING

A. General:

1. Remove and replace masonry units that are loose, chipped, broken, stained, or otherwise damaged or that do not match adjoining units. Install new units to match adjoining units; install in fresh mortar, pointed to eliminate evidence of replacement.

B. Pointing:

1. During the tooling of joints, enlarge voids and holes, except weep holes, and completely fill with mortar. Point up joints, including corners, openings, and adjacent construction, to provide a neat, uniform appearance. Prepare joints for sealant application, where indicated.

C. In-Progress Cleaning:


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1. Clean unit masonry as work progresses by dry brushing to remove mortar fins and smears before tooling joints.

D. Final Cleaning:

1. After mortar is thoroughly set and cured, clean exposed masonry as follows:

a. Remove large mortar particles by hand with wooden paddles and nonmetallic scrape hoes or chisels.

b. Clean concrete masonry by cleaning method indicated in NCMA TEK 8-4A applicable to type of stain on exposed surfaces.

c. Clean brick by bucket and brush hand-cleaning method described in BIA Technical Note No. 20 , using cleaners appropriate for conditions requiring cleaning. Apply cleaners in compliance with directions of cleaner manufacturer.

END OF SECTION


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