Ethylene Propylene Diene Monomer (EPDM) is a single layer membrane roofing material made from a synthetic rubber compound that makes it flexible. This traditional flat roof option has been used for commercial roofing since the 1960s. When comparing TPO to EPDM, consider the facts: Read more here about this or similar articles.

Reflectivity

The problem with EPDM roofing is that (unlike TPO roofing, which reflects sunlight and allows you to save energy) EPDM retains the heat of sunlight.

Seam strength

An effective roof system relies on strong seams. TPO's welds are stronger than bonded EPDM seams. Welds make TPO a monolithic membrane that covers your entire commercial roof and keeps moisture ingress at bay.

While TPO roofing chemically adheres to give your commercial building excellent coverage, EPDM is mechanically attached, leaving room for future problems. The seams of the TPO membranes are fused with a heat gun and seal your roof to protect your insulation and commercial building from moisture ingress.

Colors

TPO roofing is available in light colors such as white, gray, tan and specialty colors to make your commercial roofing “cool” and reduce your utility costs. EPDM roofs are only available in black and are not considered "cool roofs" as dark colors absorb heat.

Puncture resistance

If a single ply flat roofing material is punctured with a low pitch, leakage will occur. TPO offers better puncture resistance than reinforced EPDM. TPO has up to 3 times the puncture resistance of unreinforced EPDM at the same thickness.

Repair

TPO is a thermoplastic, so you can heat weld seams, making it ideal for repairs. Just clean the membrane and weld it on directly. If the weather is too cold to use primer and adhesives, EPDM cannot be welded or re-glued, meaning temporary fixing is required until the weather warms up again.