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Old 04-30-2020, 11:35 AM   #20
sourdough
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Join Date: Feb 2014
Location: W. Texas
Posts: 17,695
If it's oxidizing like that it is probably EPDM. Pull off the inside cover of a vent and look at the roofing material that is flapped over inside. You may have to remove a staple but I've never had to, just sort of pick up the side of it and you can tell right away.
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