Tom Barta
5/10/2008
My house has a 8:12 pitch gable that switches to a flat roof on each side (see attachment for model). The gable is shake and the flat parts are tar and gravel. Both sections are over a 2" tongue and groove deck. There is no attic space - just insulation and roofing on top. I am considering replacing the roof with standing seam after introducing a 1/4:12 pitch into the flat parts. In order for this to work architecturally the roof must not get too thick. The only products I could find for a low pitch have 3" high seams so this is a bad start. Anyone know of a shorter option? I was planning to pitch the roof with 24" OC purlins and use tapered isoboard for insulation in between. Then finish the deck with 5/8" OSB. But after reading some of the posts there was talk about the need to have a vented air gap. This could kill the project as I don't know how this could be done. Can someone suggest how to do it while keeping the thickness to a minimum?
Todd Miller
Classic Products, Inc.
5/10/2008
There are mechanically seamed standing seam panels with much shorter ribs. The ventilation concern is so that moisture generated inside the house does not find a place to condense but is instead safely vented outward.
Tom Barta
5/10/2008
Thanks Todd. Can you point me to a manufacturer of mechanically seams panels with shorter ribs rated for 1/4:12 pitch? I appreciate the need to prevent moisture from condensing on the back of the panels. Currently, air can vent between the gaps in the tongue and groove. Its not very energy efficient and I have thought about sealing these gaps. Still it is not clear if this is enough ventilation and if not what would be required. Can someone describe the recommended way to do this?
Todd Miller
Classic Products, Inc.
5/29/2008
Building code in most areas requires a 1" vented space. For a supplier, I would check with Custom-Bilt Metals.
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