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Green Roof Systems

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Green Roof Systems

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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®.

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®.

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Green Roof Systems

  1. 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® This program is registered with the AIA/CES, HSW and SD GREEN ROOF SYSTEMS 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! 1
  2. 2. Achieving High Performance Protection GREEN ROOF SYSTEMS GREEN ROOF SYSTEMS What you’ll learn today...  Advantages of a Green Roof?  Fundamental Design Elements  Why Fluid Applied Roofing System  Industry Codes and Standards 2
  3. 3. “What is a Green Roof”? GREEN ROOF SYSTEMS “What is a Green Roof”? GREEN ROOF SYSTEMS 3
  4. 4. “What is a Green Roof”? GREEN ROOF SYSTEMS “What is a Green Roof”? GREEN ROOF SYSTEMS Heinz 57, Pittsburgh, PA 4
  5. 5. “What is a Green Roof”? GREEN ROOF SYSTEMS Millennium Park Project, Chicago “What is a Green Roof”? GREEN ROOF SYSTEMS Vancouver Convention Center 5
  6. 6. GREEN ROOF SYSTEMS Bristow St, Bronx, NYC GREEN ROOF SYSTEMS Millenium Tower Residences, Battery Park City, NY 6
  7. 7. “Why do I want a Green Roof”? GREEN ROOF SYSTEMS Looks Great….but… How do I convince my client to include a Green Roof on his project? MANY BENEFITS… GREEN ROOF SYSTEMS BENEFITS • 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 7
  8. 8. Environmental Benefits GREEN ROOF SYSTEMS Vegetated 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 Vegetated Roofs Decrease Stormwater Runoff Rates An extensive green roof with 4” of growing media can: Peak • Reduce stormwater Attenuation Runoff Rate runoff by about 95% Direct Runoff • Control runoff from over With 95% of storms Roofmeadow TM • Prohibit any immediate runoff from the smallest 25% of all storms • Substantially reduce peak flow rates Time A 4” green roof would provide peak control for storm magnitudes of up to 3.5”. 8
  9. 9. GREEN ROOF SYSTEMS GREEN ROOF SYSTEMS Reduces 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. 9
  10. 10. GREEN ROOF SYSTEMS Reflective Air Temperatures (At 2 inches above roof surface) 105 Reference Mod Bit 102oF 85 Green Roof 82oF Temperature (°F) 65 Ambient Air Temperature 64o F 45 25 0:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00 0:00 Time GREEN ROOF SYSTEMS LEED 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 10
  11. 11. GREEN ROOF SYSTEMS Industry 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 SYSTEMS Fire 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 11
  12. 12. GREEN ROOF SYSTEMS VF1 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 SYSTEMS Wind Standard - RP14 • Based on ANSI/SPRI RP4 - Ballast Design Guide • Includes special provisions for vegetative roofs 12
  13. 13. GREEN ROOF SYSTEMS RP14 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 SYSTEMS General 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 13
  14. 14. GREEN ROOF SYSTEMS GREEN ROOF SYSTEMS 14
  15. 15. GREEN ROOF SYSTEMS Definitions: • Extensive < 6” • Semi Intensive 6” - 9” • Intensive 9” – 4 feet Green Roof Design Elements GREEN ROOF SYSTEMS Waterproofing Membrane The 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! 15
  16. 16. GREEN ROOF SYSTEMS Hot Fluid Applied Rubberized Waterproofing 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 16
  17. 17. GREEN ROOF SYSTEMS Hot Applied Rubberized Waterproofing GREEN ROOF SYSTEMS Deck 17
  18. 18. Hot Applied Rubberized Waterproofing GREEN ROOF SYSTEMS Polymer Modified Primer Hot Applied Rubberized Waterproofing GREEN ROOF SYSTEMS Hot Applied Rubberized Asphalt 18
  19. 19. Hot Applied Rubberized Waterproofing GREEN ROOF SYSTEMS Protection Course Hot Applied Rubberized Waterproofing GREEN ROOF SYSTEMS Insulation / Root Barrier M3 19
  20. 20. Slide 43 M3 Roofscapes, Inc. would request that this slide be altered to eliminate the DBR Rootblock 20 Muroff, 1/22/2007
  21. 21. Hot Applied Rubberized Waterproofing GREEN ROOF SYSTEMS Water Retention/Drainage M4 Hot Applied Rubberized Waterproofing GREEN ROOF SYSTEMS Filter Fabric M5 20
  22. 22. 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
  23. 23. Hot Applied Rubberized Waterproofing GREEN ROOF SYSTEMS Growing Medium, Plants M6 Hot Applied Rubberized Waterproofing GREEN ROOF SYSTEMS Why Hot Applied Rubberized Waterproofing? • 100% Solids • 40 Year Track Record • 2 ply fully bonded and seamless membrane • Cost effective • 25% recycled content • Recyclable packaging 21
  24. 24. 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
  25. 25. GREEN ROOF SYSTEMS Apply primer & complete crack treatment. GREEN ROOF SYSTEMS Heat Rubberized Asphalt in double jacketed kettle. 22
  26. 26. GREEN ROOF SYSTEMS Squeegee Rubberized Asphalt to 90mils thick base coat. GREEN ROOF SYSTEMS Place Polyester Fabric into hot base layer. 23
  27. 27. GREEN ROOF SYSTEMS Pour hot Rubberized Asphalt over Polyester Fabric. GREEN ROOF SYSTEMS Squeegee second layer over polyester to 125mils thick. 24
  28. 28. GREEN ROOF SYSTEMS Lay 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 25
  29. 29. 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 SYSTEMS Electric Field Vector Mapping (EFVM) 26
  30. 30. GREEN ROOF SYSTEMS EFVM GREEN ROOF SYSTEMS Drainage Composites: • Root barrier fabric: Prevent roots from penetrating the membrane and clogging retention/drainage core. (copper hydroxide treated) • Water Retention Layer: Stores water 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. 27
  31. 31. GREEN ROOF SYSTEMS Installation of H2O Retention / Drainage Composite GREEN ROOF SYSTEMS Application 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 28
  32. 32. Hot Applied Rubberized Waterproofing GREEN ROOF SYSTEMS National Oceanic & Atmospheric Administration, Maryland Emulating Nature GREEN ROOF SYSTEMS Green roof ready for vegetation 29
  33. 33. GREEN ROOF SYSTEMS GREEN ROOF SYSTEMS 30
  34. 34. GREEN ROOF SYSTEMS Pre-grown mats GREEN ROOF SYSTEMS Vegetative Roof Assembly Pre-Grown Mats 31
  35. 35. GREEN ROOF SYSTEMS Pre-grown mats GREEN ROOF SYSTEMS 32
  36. 36. GREEN ROOF SYSTEMS Emulating Nature: Drainage & Irrigation GREEN ROOF SYSTEMS Reasons to Irrigate • Support specific plant palate • Optimize Evapotranspiration Losses – Reduce Runoff – Modify Micro-Climate • Optimize Thermal Benefit – Evaporative Cooling (Latent heat transfer) 33
  37. 37. Emulating Nature: Drainage & Irrigation GREEN ROOF SYSTEMS Irrigation 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 SYSTEMS Capillary Irrigation Method Drip Line Capillary Fabric 34
  38. 38. Emulating Nature: Drainage & Irrigation GREEN ROOF SYSTEMS Internal Drainage GREEN ROOF SYSTEMS 35
  39. 39. Green Roof Design Elements 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 SYSTEMS 36
  40. 40. GREEN ROOF SYSTEMS GREEN ROOF SYSTEMS The Calhoun School, NYC 37
  41. 41. GREEN ROOF SYSTEMS Warranties GREEN ROOF SYSTEMS Single Source Warranty Gold Seal Conditions  System Pre-approval  All components supplied by manufacturer  Approved contractor  Roofing/waterproofing  Landscape/vegetative componenets  Installed as per written recommendations  Inspections (during and final) 38
  42. 42. 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 Commercial Products & Systems Group GREEN ROOF SYSTEMS Building Envelope Systems ® 39
  43. 43. Achieving High Performance Protection GREEN ROOF SYSTEMS THANK YOU 40

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