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Re: Putting a metal roof on a garage question.
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Posted by Mike D. ** make sure you don't trap moisture. on February 15, 2003 at 23:19:51 from (188.8.131.52):
In Reply to: Putting a metal roof on a garage question. posted by Dan on February 15, 2003 at 08:16:38:
Is this on your house, or outbuilding? It might not be a good idea to put tin over 3 tab shingles. The mineral on the shingles will act as an abrasive whenever there is a load on the tin (i.e.- snow, wind, big feet) this will score the galv. The roof will hold moisture between the layers if you don't allow for some air flow between the tin and the asphalt. With the scoring of the galv. and the dampness under the tin you will have the deal rot out from the inside out. Might take 10 years to do it, but count on it happening. Tin will last the longest when it doesn't have any substrate under it. Our house has 60 year old tin on it. When you are in the attic looking up you see the bottom side of the tin. No trapped moisture, no worries.
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