green roof systems

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1 GREEN ROOF SYSTEMS ACHIEVING HIGH PERFORMANCE PROTECTION Nexus – Green Round Table 9/14/10 Todd Skopic, CSI, CDT, LEED AP Henry Company Building Envelope Systems ® GREEN ROOF SYSTEMS This program is registered with the AIA/CES, HSW and SD for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation. Thank you!

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Leading Architects and Designers know the impact a building can have on the environment. Strategies to reduce storm water runoff and urban heat-island effect while increasing green space are issues for today’s sustainable designs. Henry’s Hot Applied Rubberized Asphalt Waterproofing and Vegetative Roof Assembly® (VRA) is a fully integrated roofing waterproofing membrane system.The Henry VRA features: SBS modified membrane with 25% recycled content, root barrier, and water retention/drainage mats which provide optimal aeration and water storage. Henry always has and always will be the best choice for providing tough and durable, economical roofing waterproofing membrane systems. This presentation will examine the problems, discuss the physical properties and review the application method of our tried and true high performance Vegetative Roof Assembly®.

TRANSCRIPT

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GREEN ROOF SYSTEMS

ACHIEVING HIGH PERFORMANCE PROTECTION

Nexus – Green Round Table

9/14/10

Todd Skopic, CSI, CDT, LEED APHenry Company

Building Envelope Systems®

GREEN ROOF SYSTEMSThis program is registered with the AIA/CES, HSW and SD for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

Thank you!

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GREEN ROOF SYSTEMSAchieving High Performance Protection

GREEN ROOF SYSTEMSWhat you’ll learn today...

Advantages of a Green Roof?

Fundamental Design Elements

Why Fluid Applied Roofing System

Industry Codes and Standards

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GREEN ROOF SYSTEMS“What is a Green Roof”?

GREEN ROOF SYSTEMS“What is a Green Roof”?

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GREEN ROOF SYSTEMS“What is a Green Roof”?

GREEN ROOF SYSTEMS“What is a Green Roof”?

Heinz 57, Pittsburgh, PA

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GREEN ROOF SYSTEMS“What is a Green Roof”?

Millennium Park Project, Chicago

GREEN ROOF SYSTEMS

Vancouver Convention Center

“What is a Green Roof”?

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GREEN ROOF SYSTEMS

Bristow St, Bronx, NYC

GREEN ROOF SYSTEMS

Millenium Tower Residences, Battery Park City, NY

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GREEN ROOF SYSTEMS

Looks Great….but…

How do I convince my client to include a Green Roof onhis project?

MANY BENEFITS…

“Why do I want a Green Roof”?

GREEN ROOF SYSTEMS

GREEN ROOF SYSTEMS

• Minimize Storm Water runoff• Economic $4.50/sq ft

– House Bill A.11226 c/o Ruben Diaz

• Extend roof membrane life• Energy Savings Impact• Public Relations/Marketing• Health/Employee Benefits• Qualify for LEED points• Visual Value

BENEFITS

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GREEN ROOF SYSTEMSVegetated Roofs Comprehensively Manage Stormwater

• Retention Function

(Permanent Storage): 15% by volume

• Detention Function

(Transient Storage):15% - 35% by volume

A green roof demonstrates a first-order discharge rate – performing as well as a detention basin.

Environmental Benefits

GREEN ROOF SYSTEMS

Time

Ru

no

ff R

ate

With RoofmeadowTM

Direct Runoff

PeakAttenuation

Vegetated Roofs Decrease Stormwater Runoff Rates

• Reduce stormwater runoff by about 95%

• Control runoff from over 95% of storms

• Prohibit any immediate runoff from the smallest 25% of all storms

• Substantially reduce peak flow rates

An extensive green roof with 4” of growing media can:

A 4” green roof would provide peak control for storm magnitudes of up to 3.5”.

Environmental Benefits

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GREEN ROOF SYSTEMS

GREEN ROOF SYSTEMSReduces Urban Heat Island Effect

Infrared image of Washington D.C.

Green roofs provide over 8,000 BTUs of cooling energy for every gallon of water that is evaporated.

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GREEN ROOF SYSTEMS

25

45

65

85

105

0:00 3:00 6:00 9:00 12:0015:0018:0021:00 0:00Time

Tem

per

atu

re (°F

)

Reference Mod Bit 102oF

Green Roof 82oF

Ambient Air Temperature 64o F

(At 2 inches above roof surface)Reflective Air Temperatures

GREEN ROOF SYSTEMSLEED Criteria v3

The Urban Heat Island category specifically references green roofs, which provide 1 credit

Green roofs can contribute to the following categories worth up to 16 points Stormwater management Water efficient landscaping Improved energy performance Reflectance reduction Recycled material content Local and regional material Innovative Design

Minimum score for LEED certification is 40 points

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GREEN ROOF SYSTEMSIndustry Standards

• VF-1 SPRI/GRHC Fire Standard – Maint., Issued 1/2010• RP – 14 SPRI/GRHC Wind Design Guide, Issued 6/2010• FMG 1-35 Property Loss Prevention Data Sheet

– Wind Uplift – Use safety factor of 1.7 of Data Sheet 1-28• FMD 4477 Approval Standard for Vegetative Roof Systems• ASTM E 2399 Granular Drainage Media for Green Roofs• ASTM E 2397 Determination of Dead and Live Loads• ASTM E 2398 Water Capture and Media Retention• ASTM E 2399 Max. Media Density for Dead Load Analysis• ASTM E 2400 Selection, Installation, and Maintenance of Plants

GREEN ROOF SYSTEMSFire Standard - VF1

• Design Standard vs. a test standard– provides a method for designing external fire resistance

for vegetative roofing systems.– provides a minimum design and installation reference for

those individuals who design, specify, and install vegetative roofing systems

– use in conjunction with the installation specifications and requirements of the manufacturer of the specific products used in the vegetative roofing system

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GREEN ROOF SYSTEMSVF1 general design considerations

• Limited to roof slope designs up to 2:12• Design roof for wind resistance before designing for fire

resistance• Use either a fire resistant roof design as defined in the standard,

or as approved by the authority having jurisdiction– Succulent based systems– Grass based systems

• Requires a Class A rated continuous border for a minimum of 6’around roof top structures, equipment and penetrations

• Requires the use of a firestop to partition large roof areas into sections not exceeding 15,625 ft2 with no dimension greater than 125’.– Fire stop walls: non-combustible construction extending 3’ above

roof surface– Fire break: 6’ wide Class A

GREEN ROOF SYSTEMSWind Standard - RP14

• Based on ANSI/SPRI RP4 - Ballast Design Guide

• Includes special provisions for vegetative roofs

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GREEN ROOF SYSTEMSRP14 provides…

• A method of designing wind uplift resistance of vegetative roofing systems.

• It is intended to provide a minimum design and installation reference.

• It shall be used in conjunction with the installation specifications and requirements of the manufacturer of the specific products used in the vegetative roofing system.

GREEN ROOF SYSTEMSGeneral design considerations

• Requires licensed design professional when:– building height exceeds 150 feet– maximum 3-second gust wind speed exceeds

140 miles per hour– Located in a windborne debris region– Slopes greater than 1.5”

• Wind erosion– Areas with exposed growth media greater than

5” in diameter require provisions for preventing wind erosion

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GREEN ROOF SYSTEMS

GREEN ROOF SYSTEMS

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GREEN ROOF SYSTEMSDefinitions:

• Extensive< 6”

• Semi Intensive6” - 9”

• Intensive9” – 4 feet

GREEN ROOF SYSTEMS

Waterproofing MembraneThe most critical design element of any Green Roof System is the Waterproofing Membrane. No matter how good it looks on top, it must keep the water out!

Green Roof Design Elements

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GREEN ROOF SYSTEMS

GREEN ROOF SYSTEMS

•Proven Performance• 2ply fully bonded seamless membrane (PMR)

• CAN/CGSB 37.50

• UL Class A (R13831)

• 40 Year Track Record

• Workmanship Warranties

• VRA Single Source

Hot Fluid Applied Rubberized Waterproofing

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GREEN ROOF SYSTEMS

GREEN ROOF SYSTEMS

Deck

Hot Applied Rubberized Waterproofing

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GREEN ROOF SYSTEMS

Polymer Modified Primer

Hot Applied Rubberized Waterproofing

GREEN ROOF SYSTEMS

Hot Applied Rubberized Asphalt

Hot Applied Rubberized Waterproofing

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GREEN ROOF SYSTEMS

Protection Course

Hot Applied Rubberized Waterproofing

GREEN ROOF SYSTEMS

Insulation /Root Barrier

Hot Applied Rubberized Waterproofing

M3

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Slide 43

M3 Roofscapes, Inc. would request that this slide be altered to eliminate the DBR Rootblock 20Muroff, 1/22/2007

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GREEN ROOF SYSTEMS

Water Retention/Drainage

Hot Applied Rubberized Waterproofing

M4

GREEN ROOF SYSTEMS

Filter Fabric

Hot Applied Rubberized Waterproofing

M5

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Slide 44

M4 Roofscapes, Inc. would request that the sheet drain layer be replaced with a Root Barrier, as indicated in thsi slide.Muroff, 1/22/2007

Slide 45

M5 Roofscapes, Inc. would request that the DBR product be eliminated from the profile and that a "drainage/water retention layer" be added on top of the Root Barrier and beneath the filter fabric. The Root Barrier would be installed over the insulation. Muroff, 1/22/2007

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GREEN ROOF SYSTEMSGrowing Medium, Plants

Hot Applied Rubberized Waterproofing

M6

GREEN ROOF SYSTEMS

• 100% Solids

• 40 Year Track Record

• 2 ply fully bonded and seamless membrane

• Cost effective

• 25% recycled content

• Recyclable packaging

Why Hot Applied Rubberized Waterproofing?

Hot Applied Rubberized Waterproofing

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Slide 46

M6 Roofscapes, Inc. would request that the DBR product be eliminated from the profile and that a "drainage/water retention layer" be added on top of the Root Barrier and beneath the filter fabric. The Root Barrier would be installed over the insulation. Muroff, 1/22/2007

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GREEN ROOF SYSTEMSApply primer & complete crack treatment.

GREEN ROOF SYSTEMSHeat Rubberized Asphalt in double jacketed kettle.

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GREEN ROOF SYSTEMSSqueegee Rubberized Asphalt to 90mils thick base coat.

GREEN ROOF SYSTEMSPlace Polyester Fabric into hot base layer.

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GREEN ROOF SYSTEMSPour hot Rubberized Asphalt over Polyester Fabric.

GREEN ROOF SYSTEMSSqueegee second layer over polyester to 125mils thick.

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GREEN ROOF SYSTEMSLay MB Protection Course into hot Rubberized Asphalt .

GREEN ROOF SYSTEMS

• Hot Fluid Applied Membranes Potential Limitations: Heated Kettle on the roof

Impractical for small areas or confined spaces

Specialized contractors

Odors

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GREEN ROOF SYSTEMS

As an Alternative to Hot Rubber• COLD FLUID APPLIED POLYETHER, • HIGH SOLIDS, • ELASTOMERIC,• MOISTURE CURE, • RUBBERIZED WATERPOOFING MEMBRANE

2 ply polyester reinforced application Fully bonded seamless membrane Contains no solvents, Very Low VOC, LOW odor Environmentally friendly, Recyclable Pails Can be applied to Green Concrete Safer than HOT

GREEN ROOF SYSTEMSElectric Field Vector Mapping (EFVM)

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GREEN ROOF SYSTEMSEFVM

GREEN ROOF SYSTEMSDrainage Composites:

• Root barrier fabric: Prevent roots from penetrating the membrane and clogging retention/drainage core. (copper hydroxide treated)

• Water Retention Layer: Storeswater to hydrate soil. Extremely important on Extensive Systems with shallow growing medium (soil).

• Drainage Layer: Serves to drain excess water away from system. Most important function for extensive and intensive systems.

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GREEN ROOF SYSTEMSInstallation of H2O Retention / Drainage Composite

GREEN ROOF SYSTEMSApplication of a light weight growing medium

•Not DIRT

•Expanded shale / clay

•Quality sand (golf course)

•Low Organic 12-15%

• 6-7 lbs/inch/sq. ft. saturated

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GREEN ROOF SYSTEMS

National Oceanic & Atmospheric Administration, Maryland

Hot Applied Rubberized Waterproofing

GREEN ROOF SYSTEMSGreen roof ready for vegetation

Emulating Nature

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GREEN ROOF SYSTEMS

GREEN ROOF SYSTEMS

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GREEN ROOF SYSTEMSPre-grown mats

GREEN ROOF SYSTEMSVegetative Roof Assembly

PrePre--Grown MatsGrown Mats

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GREEN ROOF SYSTEMSPre-grown mats

GREEN ROOF SYSTEMS

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GREEN ROOF SYSTEMS

GREEN ROOF SYSTEMSReasons to Irrigate

• Support specific plant palate

• Optimize Evapotranspiration Losses

– Reduce Runoff

– Modify Micro-Climate

• Optimize Thermal Benefit

– Evaporative Cooling (Latent heat transfer)

Emulating Nature: Drainage & Irrigation

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GREEN ROOF SYSTEMSIrrigation Methods

Surface Systems[Required for most systems with artificial drainage layers]

– Drip (Media depth of 6 in, or greater, recommended) – Overhead Spray

Sub-Surface Systems[Single layer systems, or systems with granular drainage

layer]– Capillary

Emulating Nature: Drainage & Irrigation

GREEN ROOF SYSTEMSCapillary Irrigation Method

Drip Line

Capillary Fabric

Emulating Nature: Drainage & Irrigation

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GREEN ROOF SYSTEMSInternal Drainage

Emulating Nature: Drainage & Irrigation

GREEN ROOF SYSTEMS

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GREEN ROOF SYSTEMS

Roof Drains

Green roof systems require drainage at various levels. Bi-level type roof drains are installed and wrapped by the filter fabric to control silts from washing through.

Green Roof Design Elements

GREEN ROOF SYSTEMS

GREEN ROOF SYSTEMS

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GREEN ROOF SYSTEMS

GREEN ROOF SYSTEMS

The Calhoun School, NYC

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GREEN ROOF SYSTEMSWarranties

GREEN ROOF SYSTEMSSingle Source Warranty

Gold Seal

Conditions System Pre-approval

All components supplied by manufacturer

Approved contractorRoofing/waterproofing

Landscape/vegetative componenets

Installed as per written recommendations

Inspections (during and final)

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GREEN ROOF SYSTEMS

CONCLUSION

• Beneficial to our environment.

• Driven by Storm Water Management & LEED points.

• Waterproofing/Roofing System Integrity/Longevity.

• Collaboration of multiple team members.

• Read manufacturer’s Technical Data Sheets.

• Well written Specifications are essential.

• Talk to a manufacturer you can trust!

• www.greenroofs.com

• www.greenroofs.org

GREEN ROOF SYSTEMSCommercial Products & Systems Group

Building Envelope Systems ®

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GREEN ROOF SYSTEMSAchieving High Performance Protection

THANK YOU