EPDM is anoption for flat roofing. This product is used in mechanically attached and fully adhered roofing systems in new construction, reroofing and recovering applications. It may also be used as a flexible membrane flashing for walls and curbs. When installing and EPDM membrane roofing system it must be installed over an acceptable roof insulation or other suitable substrate. The thickness available for EPDM is 45, 60, and 75 MIL. Its available in black or white only. PVC is membrane roofing is another option when looking at a low-slope roofing system. The thickness available for this system is 50, 60, and 80 MIL. PVC is a reliable and versatile membrane with flexibility as well as resistance to UV, Ozone, Chemicals, Tears and punctures. Its membrane feature heat-welded seams, a white reflective color and ease of repairs.