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TOPIC: Underlayment

underlayment necessary with purlins

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considering a new metal roof over 1 layer of old 3 tab shingles. spoke with the contractor about underlayment and his plans are to lay a 2x4 purlins grid ontop of the old shingles and attach metal to that. i asked if underlayment was necessary due to moisture and he said there would be none. They would use that in more of a pole barn scenario. he is a qualified metal roofer but if im gonna spend the money i want to make sure the product will last like it is supposed to
Guest User

3/5/2010
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I personally would suggest a layer of underlayment before the purlins. Todd Miller
Todd Miller
Isaiah Industries, Inc.

3/8/2010
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+1 Very cheap insurance. Eric Novotny
Eric Novotny
An informed customer is the Best Customer!

3/8/2010
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