solving the waterproofing puzzle: plaza decks and · pdf filesolving the waterproofing puzzle:...
TRANSCRIPT
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Solving the Waterproofing Puzzle: Plaza Decks and Green RoofsPlaza Decks and Green Roofs
January 16, 2009CRCA 26th Annual Trade Show
Speaker: Richard Koziol, AIA, NCARBWiss, Janney, Elstner Associates, Inc.
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Copyright Materials
This presentation is protected by US and International i ht l R d ti di t ib ti di l dcopyright laws. Reproduction, distribution, display, and
use of this presentation without written permission of the speaker is prohibited.
© Wiss, Janney, Elstner Associates, Inc. 2009
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Learning Objectives
1. Avoiding common pitfalls.
2. Review waterproofing design concepts and industry standards.
3. Review waterproofing fundamentals and integration with various building elements and flashing conditions.
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Acknowledgements / Credits
• American Hydrotech, Inc.
• ASTM International
• City of Chicago Energy Code• City of Chicago Energy Code
• National Roofing Contractors Association (NRCA)
• Sika Sarnafil, Inc.
• Siplast
• Soprema Inc• Soprema, Inc.
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Outline
• What is Sustainable Waterproofing?
• LEED Rating Systems
• Examples of Integrated Green Roofs and Plazas
• Waterproofing Concepts for Green Roofs and Plaza Decks
• Conclusions
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Sustainable Waterproofing
A waterproofing system that is designed, constr cted maintained rehabilitated andconstructed, maintained, rehabilitated, and demolished with an emphasis throughout its life cycle on using natural resources efficientlylife cycle on using natural resources efficiently and preserving the global environment.
Proceedings of the Sustainable Low-Slope Roofing WorkshopOak Ridge National Laboratory, October 1996
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Waterproofing
Treatment of a surface or structure to prevent thepassage of ater nder h drostatic conditionspassage of water under hydrostatic conditions.
1” f t 5 2 Lb /ft21” of water = 5.2 Lbs/ft2
Waterproofing must be able to:
• Perform in a constantly wet environment
• Resist mild acids, alkalis, salts, and soil contaminates
• Best applied directly to structure
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Roofing vs. Waterproofing
Roofing Systems• Resist ultraviolet radiation• Resist temperature variation• Accessible for maintenance
and repairand repair• Moderate costs to re-cover
or replace
Waterproofing Systems• Resist standing water and
hydrostatic pressure• Usually covered with overburden• Restricted access for repairsRestricted access for repairs
can be costly to replace
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Protected Membrane Assembly
• Pavers or rock ballast on extruded polystyrene insulation over waterproofing membraneinsulation over waterproofing membrane
• Minimize thermal cycling on membrane• Protect against UV• Protect against physical damage
Membrane must resistMembrane must resistconstantly wet conditions.
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Sustainable Waterproofing Concepts
• Extend building and roof life span by improving long term performanceterm performance
• Conserve energy by improving thermal efficiency of green roofs and plaza decksg p
• Minimize environmental burden by responsible use of earth’s natural resources
Tom HutchinsonHutchinson Design Group
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LEED
The Leadership in Energy and Environmental Design (LEED) green building rating system was initiated by the U.S. g g g y yEnvironmental Protection Agency and private industry.
Awards program based on points earned for sustainable design:Awards program based on points earned for sustainable design:
• Platinum• Gold• Silver• Certified (primarily for new construction)
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Possible LEED Points at Rooftop
Category Points
Storm Water Management (rate and quantity) 1 Storm Water Management (treatment) 1 Heat Island Effect (roof) 1 ( )Innovative Wastewater Technologies 1 Renewable Energy 1Resource Reuse 2 Recycled Content 2 Local/Regional Materials 1 Certified Wood 1Certified Wood 1 Low Emitting Materials 2 Innovation in Design 1
Total Possible Points 14
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Green Roof and Plaza Benefits
• Storm water management
• Reduce rooftop temperatures
• Improve air quality
• Mitigate urban heat island effects
• Aesthetic enhancement
• Community green space
• Enhance ecological balance• Enhance ecological balance
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Energy Performance
According to the Department of Energy (DOE), energy use by buildings accounts for approximately 40 percentuse by buildings accounts for approximately 40 percent of all energy consumption in the United States.
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Millennium Park Chicago, IL
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Types of Plaza’s and Green Roofs
• Plaza Decks and Terrace Pedestrian and/or vehicular usePedestrian and/or vehicular use
• ExtensiveLow maintenance, non-recreational, withLow maintenance, non recreational, with shallow soil depths (integrated or in containers)
• Intensive
Wide range of vegetation, recreational with deeper soil beds (integrated)
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Code Issues• IBC Section 1607 Live Loads: Roof gardens and roofs for
assembly to have 100 psf live load, plus dead load.
• IBC Section 1607.11.2.3 Landscaped Roofs: Minimum 20 psf live load, in addition to the dead load (saturated soil).
• Fire resistance and protection, and wind uplift ???
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Intensive Green Roof and Plaza Deck
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Extensive Green Roof/ Plaza Deck
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Intensive Green Roof/ Plaza Deck
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Sustainable Concepts for Waterproofing G fGreen Roofs and Plaza Decks
• Design:Design:Materials selection and reference standards
(ASTM NRCA Manufacturers’ Literature others)(ASTM, NRCA, Manufacturers Literature, others)
• Detailing: Improve performance and durability
• Construction:Construction: Protection, sequencing issues, and testing of waterproofing membrane for longevityp g g y
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Green Roof Waterproofing
• Structural considerations• High performance waterproofing membraneHigh performance waterproofing membrane • Membrane adhesion
(adhered to deck or loose laid)• Membrane protection
(root barriers, protection slabsprotection slabs, etc.)
• Thermal insulation (above vs. below the membrane)
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Material Issues
• Robust roof deck
• High performance waterproofing membrane• High performance waterproofing membrane
• Protection course
• Insulation• Insulation
• Drainage course
• Water retention layer• Water retention layer
• Filter layer(s)
• Selection of soil and overburden for green roofs and• Selection of soil and overburden for green roofs and
wearing surfaces for plazas
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Green Roof System Components
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Plaza Deck Waterproofing
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Plaza Deck Waterproofing Considerations
• High performance of waterproofing membrane • Adhered or loose laid waterproofing membrane• Resistance to standing water and hydrostatic pressure• Ability to accommodate vehicular and/or pedestrian loading• Provide access for repairs• Provide access for repairs
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High Performance Waterproofing Membrane (H t A li d R bb i d A h lt)(Hot Applied Rubberized Asphalt)
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High Performance Waterproofing Membrane (M difi d Bit )(Modified Bitumen)
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High Performance Waterproofing Membrane (L L id Sh t ith Adh d G id St i )(Loose Laid Sheet with Adhered Grid Strip)
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Design and Construction Issues• Establish and coordinate slab elevations and flashing tolerances • Accommodate movement at walls and structural changes• Provide slope to drain, or add supplemental drains• Specify high performance waterproofing membrane• Elevate vulnerable elements above membrane level• Maintain flashing clearances• Provide redundancy in flashing details • Provide protection for base flashingsProvide protection for base flashings• Extend flashing above the wearing or overburden surface• Provide flashed chases as future raceway for utilities• Design considerations for planters• Design considerations for planters• Building code issues
ASTM standards NRCA Waterproofing Manual ACI 515ASTM standards, NRCA Waterproofing Manual, ACI 515, and manufacturers’ literature are all excellent resources!
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ASTM Standards to Assist Design and Detailing
• D 5295 Preparation of Concrete Surfaces for Adhered (Bonded) Membrane Waterproofing Systems
• D 5898 Standard Details for Adhered Sheet Waterproofing
• C 981 Design of Built-up Bituminous Membrane Waterproofing for Building Decks
• C 898 High Solids Content, Cold-Applied Elastomeric Waterproofing Membrane with Separate Wearing Course
• D 6622 Standard Guide for Application of Fully-Adhered Hot-AppliedD 6622 Standard Guide for Application of Fully Adhered Hot Applied Reinforced Waterproofing Systems
• D 6135 Standard Practice for Application of Self-Adhering Modified Bituminous Waterproofingp g
• D 6950 Standard Practice for Application of Heat Weldable Attactic Polypropylene (APP) Modified Bituminous Waterproofing Membrane Systems for New Building Decks
• E 2400 Standard Guide for Selection, Installation, and Maintenance of Plants for Green Roofs
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ASTM Standards to Assist Design and Detailing
Elevate critical details above the waterproofing membrane and extend the flashing above the finished grade or surface.
Illustration from ASTM C 981
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NRCA Standards to Assist Design and Detailing
• NRCA Waterproofing Manual• NRCA Green Roof Systems Manual (2007)
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Slope for Drainage• Sloped concrete topping slab• Sloped structural concrete slab
Supplemental drains• Supplemental drains
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Drains• Utilize two-stage drains for plaza decks• Isolate drain from rigid wearing surface
Filter media should contain fines sand and soil• Filter media should contain fines, sand, and soil
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Expansion Joints• Elevate flashing• Provide redundant detailing
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Walls• Accommodate differential
movement
• Provide sufficient flashing clearance, 8 inches
• Integrate deck flashing with wall system weather barrier
R d d i fl hi• Redundancy in flashing details
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Flashing at Walls Problem Areas:• Low Curbs
D d D Cl• Doors and Door Closers• Integration with Wall Flashing
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Doors and Low Height Curbs• Integration with wall flashing• Integration with doors
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Integration with Walls• Sufficient base flashing height• Access for maintenance and future replacement• Redundant flashing details to accommodate differential movement• Redundant flashing details to accommodate differential movement
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Integration with WallsProblem:Inadequate coordination between deck and wall system
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Access for Future Utilities
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Planters
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Planters
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Construction Issues• Specify temporary membrane to accommodate construction
means and methods
• Specify protection of completed high performance waterproofing membrane
• Testing of waterproofing system Flood testing Electronic leak detection using electric field vector mapping (EFVM)Electronic leak detection using electric field vector mapping (EFVM)
• Third party inspection
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Sequencing and Protection
• Temporary membrane• Initial complete protection followed by flood testingInitial complete protection followed by flood testing
and/or EVFM testing after other trades
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Flood TestingASTM D 5957 Standard Guide for Flood Testing Horizontal Waterproofing Installations
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Electric Field Vector Mapping (EFVM) Testing
High Voltage Low Voltage
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Summary of Water Proofing Design
Design Issues
Concepts for Green Roofs and Plaza Decks
• Appropriate Material Selection • Drainage• Wall FlashingsWall Flashings• Utility Access • Anticipating Construction Sequence in the Details
M i t i bilit / F t R i i• Maintainability / Future Revisions• Correct existing deficiencies in related building
components and systemsConstruction Issues
• Temporary membrane or Ample Protection • Field Testing of Completed Assemblyg p y
Flood TestingEFVM (High or Low Voltage)
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THANK YOU
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Improve Green Roof and Plaza Deck
• Robust roof deck
Performance and DurabilityRobust roof deck
• Redundant flashing system and detailing
• Slope and drainageSlope and drainage
• Insulation
• High performance waterproofing membrane• High performance waterproofing membrane
• Root barrier
• Filter layers• Filter layers
• Water retention layers
• Soils and plants• Soils and plants
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