What is EPDM?

EPDM is an extremely durable synthetic rubber roofing membrane  (ethylene propylene diene terpolymer) widely used in low-slope buildings worldwide. Its two primary ingredients, ethylene and propylene, are derived from oil and natural gas.

What are the advantages of ePDM?

1. Time tested EPDM membrane can last up to 50 years and the cost to remediate and extend its life can be as little as 5% of the cost of a new roof.

2. Superior weathering resistance EPDM has advanced resistance to UV exposure, heat, and mold:

» ASTM G155 for Xenon Arc = 41,580 kJ/m² for black EPDM and 25,200 kJ/m² for white EPDM

» ASTM D573 for heat aging = 68 weeks at 240°F

» ASTM G21 for fungi = zero (no growth)

3. Superior hail resistance Numerous studies and real-world experience confirm that EPDM’s 465% elongation (ASTM D412) and weathering resistance result in superior hail damage resistance and UL2218 Class 4 rating.

4. Energy efficient In northern climates, the solar thermal benefits of black EPDM helps to reduce heating costs, which are typically 3-5 times greater than air-conditioning costs. Reflective white EPDM helps to reduce cooling costs in southern climates. The cross-linked nature of EPDM can handle the heat of southern climates.

5. Stable EPDM is the most dimensionally stable membrane, remaining flexible even in extremely cold conditions. Per ASTM D5279-08, EPDM is more flexible at 0°F than TPO at 100°F.

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