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TOPIC: General Discussion

do i need to use wood strapping for metal panels over asphalt?

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I have a detached garage with a single layer of asphalt shingles. I want to put metal on top of existing. Do I need to use wood strapping? I've had some say absolutely and others say not needed since existing asphalt is vapor barrier
Guest User

10/22/2010
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If the garage is unconditioned space, a properly slip layer will be all that you should need. If it was conditioned space, I would recommend purlins and over deck venting. Eric Novotny
Eric Novotny
An informed customer is the Best Customer!

10/22/2010
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Thanks for your response. So the existing shingles would be a "properly slip layer" ?
Guest User

10/25/2010
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Always adhere ot manufacturer instructions. If you have a vented attic then I would say strapping is not essential. I would suggest a layer of underlayment such as a synthetic underlayment down over the old shingles regardless. Todd Miller
Todd Miller
Isaiah Industries, Inc.

11/1/2010
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Asphalt is not the slip layer as Todd indicated. Synthetic underlayment would likely serve this purpose perfectly but check with the manufacturer on their recommendations. If it is above an un-heated garage, you really don't have any ventilation requirements. Eric Novotny
Eric Novotny
An informed customer is the Best Customer!

11/2/2010
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