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Can EPDM be bonded directly over asphalt, tar, shingles, asphalt rolled roofing or felt paper?

April 26, 2017Asphalt bonded directly EPDM felt paper Roofing Shingles tar

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Can EPDM be bonded directly over asphalt, tar, shingles, asphalt rolled roofing or felt paper?

1 Answer

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10 Posted

No, the oils in pertroleum based products will cause EPDM to swell and fail. EPDM should be bonded over 5/8″ plywood, 5/8″ OSB board, or polyisocyanurate board with a fiberglass backing.