EPDM vs PVC

A debate that comes up is whether to install a PVC roofor an EPDM roof. Both flat roof systems have been around for a similar amount of time, and have unique attributes that are beneficial or detrimental, based on how your building is used.

A PVC Versus EPDM comparison chart is below.

	PVC	EPDM	Advantage
Years Used as Roofing Product	Over 50 Years, but formula has changed dramatically over time	Over 40 Years	EPDM, since formula has been more consistent.
Base Product	Vinyl / Plastics	Synthetic Rubber	Neutral
Color	White, Gray, Tan	Black + White at price premium	PVC
Temperature Impact on Roof	Cools Roof	Heats roof (Unless white)	PVC if lots of HVAC and other rooftop equipment. EPDM if minimal rooftop units. *EPDM melts small amounts of snow if black EPDM is exposed. Once roof is completely snow covered, doesn’t help at all.)
Seaming technology	Heat Welded	After 1980, 3” or 6” Seam Tape.Before 1980, liquid adhesives	PVC
Thicknesses	.036 to .090	.045 to .090	Neutral
Reinforced	Always Reinforced (Older non-reinforced systems could shatter)	Reinforced or Non-Reinforced	Neutral
Puncture Resistance	OK to Good, depending on thickness and manufacturer	Good to excellent, depending on thickness	EPDM
Chemical Resistance	Excellent	Poor	PVC
Environmental Impact	Poor – is actually banned in some countries	Moderate	EPDM
Slippery With Moisture	Yes	Yes – Moderate	EPDM
Known Problems	Shatters under colder conditions. Shrinks over time causing numerous issues. Expensive compared to other single ply products. Many concerns with fire resistance and fumes emitted when burned. Effective welding requires experience.	Seams come apart over time. Grease and other chemicals deteriorate product. Creates hot environments for rooftop equipment.	Depends on building!