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Old 10-11-2011, 08:37 PM   #1
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metal roof


will 30# felt work as underlayment ,on top of 5/8 sheeting then felt then metal. or will the felt hold moisture under it and rot your plywood ?

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Old 10-11-2011, 10:35 PM   #2
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metal roof


I just put up a snap-lock standing seam metal roof and the metal roof manufacturer's specs called for 30# felt as an underlayment. 30# felt has been around for awhile and has a proven track record for use as an underlayment for many different types of roofing material.

If you're asking whether it's okay to lay 30# felt over wet sheeting then that's a different question. I wouldn't want to put felt over wet plywood. That's just me I don't know what the pros would say.

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