1. The Greening of the Rooftop Module 9 Other Green Roofing Options

2. Roofing Green Other Green Options Low VOC Materials Roof Recycling

3. Green Materials: Volatile Organic Compounds (VOCs) Solvent-Based Roofing Adhesives VOCs Source: US EPA

4. Green Materials: VOCs and Ground Level Ozone Source: US EPA

5. Water-based adhesives High-solids adhesives Urethane adhesives Low-VOC Alternatives Green Materials: Reducing VOCs

6. 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

7. 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

8. 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.

9. Roof Recycling Example Asphalt Shingle Recycling Source: American Roofing Recyclers, Snohomish, WA. Asphalt Shingles Paving Additives Roof Flood Coat Dressing

10. Roof Recycling Example Wood Shake Recycling Source: American Roofing Recyclers, Snohomish, WA. Wood Shakes Cedar Mulch Fuel

11. Roof Recycling Example PVC Membrane Recycling 1 Cut 2 Roll 3 Stack & Palletize 4 Grind & Pelletize Source: Sika-Sarnafil

12. 1 Windrow & Sweep 2 Cut & Stack 3 Chop 4 GrindSieve & Package 5 Recycle 6 Roof Recycling Example EPDM Membrane Recycling Source: EPDM Roofing Association

13. 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