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I saw a house I really liked with standing metal roof on purlins on steel beams. Batt insulation is hung or tucked in between the purlins. Everything is exposed. It doensn't look like there is any decking, metal or wood.
How is this done? Would there be a moisture barrier under the metal roof, then a substrate, then the purlins? It didn't look like there is anything like a substrate there.
How about condensation and siince there is no attic, how is all that vented?
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There are standing seam systems installed direct to purlins -- no decking. And, yes, with those systems, ideally there would be a ventilated attic as well as a vapor barrier and insulation down on top of the ceilings. Also, there could be a vapor barrier and insulation beneath the roofing -- like with an industrial building.
However, all that said, most manufacturers of the products which can be installed direct to purlins do not necessarily suggest doing that for residential applications. Their preference often will be to use decking on residential jobs. This must be checked into with the metal roofing manufacturer.
9/29/2004
Or copy this URL: https://www.metalroofing.com/spirit/comment/4172/find/9/30/2004
Or copy this URL: https://www.metalroofing.com/spirit/comment/4173/find/