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We have a large open lodge type house with an exposed beam ceiling in a large portion of it. In that large area there is no attic. It's just boards and shingles between us and the sky. We currently have rolled roofing and want to upgrade to a metal roof. What kind of insulation options do we have on the roof? We don't want to take away the exposed beam look on the inside, but we would also like to save on our utility bills.
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A good radiant barrier insulation under some 1 x 4 batten strips will provide a 3/4 air gap between the deck and the metal panels. Add an air intake at the eave and a vented ridge and you should be set.
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Would it be o.k to put that over the rolled roofing that is already there? I know that a lot of metal roofing is put over the top, but was not sure about adding the insulation on top. Would it create a moisture problem? There are no roof vents.
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Polyisocyanurate roofing insulation could be installed on top of the deck. I have seen it done without a new deck on top of it, but I think a nailbase (insulated roof deck panels) would be even better.
7/31/2009
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7/31/2009
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8/9/2009
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8/25/2009
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