Special thanks to Camper Clinic II in Austin Texas for helping with the answer. Elaine and Les took time out of their busy day to give a true “RV expert” view on this RV Roof question. Find out more about Camper Clinic II here: Camper Clinic II Page on RV52
The Reader Question in their WORDS: Hello, my question is: How can I tell if I have a EPDM or a TPO type RV roof on my RV?
The answer from Elaine and Les in their own words is:
The service folks at Camper Clinic II tell us that EPDM rubber (ethylene propylene diene monomer rubber) is a pliable rubber. It's much more flexible than the TPO (Thermoplastic Olefin). Another differentiator is the backing. In the RV industry, the EPDM typically has a black backing, and in other industries, it's often solid black. The TPO has a felt backing. For more info, checkoutwww.roofhelp.com/choices/tpo or find more about EPDM on Wikipedia: en.wikipedia.org/wiki/EPDM_rubber. To summarize: The TPO has a felt backing and is stiff. The EPDM is a pliable rubber with a black backing. That's the difference.