do i need to use wood strapping for metal panels over asphalt? | Ask The Experts Forum

Guest User 10/22/2010	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	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/15311/find/
Eric Novotny An informed customer is the Best Customer! 10/22/2010	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.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/15312/find/
Guest User 10/25/2010	Thanks for your response. So the existing shingles would be a "properly slip layer" ?	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/15313/find/
Todd Miller Isaiah Industries, Inc. 11/1/2010	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.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/15314/find/
Eric Novotny An informed customer is the Best Customer! 11/2/2010	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.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/15315/find/

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