The Greening of the Rooftop Module 9 Other Green Roofing Options
Roofing Green Other Green Options Low VOC Materials Roof Recycling
Green Materials: Volatile Organic Compounds (VOCs) Solvent-Based Roofing Adhesives VOCs Source: US EPA
Green Materials: VOCs and Ground Level Ozone Source: US EPA
Water-based adhesives High-solids adhesives Urethane adhesives Low-VOC Alternatives Green Materials: Reducing VOCs
Alternative: Water-Based High-Solids Urethanes Limitations: Freezing, Slow Flash-Off Primer Frequently Required Complicated & Relatively Expensive Typical Example: Latex Paint Tapes Foam Adhesive 2-Part Adhesive Green Materials: Reducing VOCs
160 Million Tons Of Construction Waste 40 Million Tons of Roofing Waste 25%+ of Total Construction Waste Annual U.S. Landfill Waste Source: US EPA (1998) Green Materials: Construction Waste
Green Materials: Roof Recycling Asphalt Shingles / Wood Shakes: Local and regional recyclers are developing roof recycling programs. Single-Plies: Several roofing manufacturers and trade associations have initiated recycling pilot programs for some single-ply membranes. Metal Roofing: The metal industries have well- established recycling programs.
Roof Recycling Example Asphalt Shingle Recycling Source: American Roofing Recyclers, Snohomish, WA. Asphalt Shingles Paving Additives Roof Flood Coat Dressing
Roof Recycling Example Wood Shake Recycling Source: American Roofing Recyclers, Snohomish, WA. Wood Shakes Cedar Mulch Fuel
Roof Recycling Example PVC Membrane Recycling 1 Cut 2 Roll 3 Stack & Palletize 4 Grind & Pelletize Source: Sika-Sarnafil
1 Windrow & Sweep 2 Cut & Stack 3 Chop 4 GrindSieve & Package 5 Recycle 6 Roof Recycling Example EPDM Membrane Recycling Source: EPDM Roofing Association
Benefits: Current Limitations: Economics do not currently support recycling Only available in a regional pilot programs for selected products Logistics (removal, storage, transportation) are difficult Recyclers must have an assured supply before end markets can be fully developed Landfill waste reduced Overall environmental impact reduced Roof Recycling Benefits & Limitations