I've seen some similair questions, so I hope I'm not being redundant. The house in question is in western/nothern Maine (i.e., snow country) and has the oringinal timber frame structure from ~ 1880. The timber frame structure (horizontal purlins etc) means that venting within the existing roof structure will not be possible. Here are my questions: If we simply have the shingles torn off, put plywood down and have a standing seam metal roof installed is that OK? I know we won't get ice dams with the metal roof, but I'm concrened that even with our best efforts to insulate and put in a vapor barrier inside (we're gutting the 2nd floor at the same time so it will be a good time to put in a vapor barrier and insualtion) eventually some moisture will find it's way to the underside of the metal roof and cause problems? I'm just not sure we can gaurantee moisture won't somehow make it past a vapor barrier. Is the best alternative to strip the shingles put down vertical furring strips -(can we just use 1x3 furring strips 16" oc. (instead of. 2x4's)) and put 5/8 plywood over that for the metal roof? I would think that 3/4" air space with a soffit vent would provide enough air circulation if moisture did ever get past our vapior barrier (and we would have a "cold roof"). Does this appraoch seem logical? I appreaciate any thoughts. Chris
Guest User
I strongly suggest a minimum 1" airspace, fed by soffit vents and a ridge vent as the exhaust. The requirements for fastening the metal roof will be determined based upon the type of metal roof you choose. If you'd like to discuss this further, give me a call at 1-800-543-8938 ext 201
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