Material Questions

WHAT DOES EPDM LOOK LIKE?

Black EPDM has a smooth surface similar to natural gray slate and does not contain surface granules that can eventually be lost on other materials. White EPDM also has a smooth surface, but is white. It combines the high-performance standards of traditional EPDM with a highly reflective, environmentally friendly surface designed to cut energy costs. When used appropriately, usually in warm climates, white EPDM can reduce air-conditioning costs without sacrificing durability of the roofing system.

WHAT IS EPDM?

EPDM is an elastomeric compound that is manufactured from ethylene, propylene, and a small amount of diene monomer. These ingredients are synthesized to produce a product that exhibits a high degree of ozone, ultraviolet, weathering and abrasion resistance, and outstanding low temperature flexibility. These ingredients also contribute to resistance to acids, alkalis, and oxygenated solvents (i. e. , ketones, esters, and alcohols).

As a vulcanized (thermoset) elastomer, how does EPDM differ from other types of single-plies (i.e. PVC, TPO, single-ply/non-vulcanized elastomer?)

EPDM membrane is a vulcanized/thermoset membrane that has been fully cured in the manufacturing process prior to shipment and delivery to the job site. With aging, EPDM membrane will not leech or emit hazardous chemicals. Unlike non-vulcanized elastomers that may begin curing in the field once exposed to moisture and heat, EPDM membrane has no shelf life. Its physical properties remain stable, which makes repairs much easier in the unlikely event of cuts or tears.