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Roofing
I've seen it used here on the Gulf coast on homes that survived hurricane Katrina just off the beach. It's sold at Lowes here too. But I have to wonder: even though it has been used for many years how will long will it be when it falls out of favor and is suplanted by the galvalume steel panels? Where do you find replacment panels? It's fairly thick and appears to have a rough, mesh-like finish which should take paint. That may not be a good thing if mold and algae are a problem as the spores will have little ponds to hang out in. From a sound-proofing standpoint it appears to be an asphalt-based product; it would lend itself to a quiter roof underneath. If I used it I'd buy enough to keep on hand as replacements for storm damage or if you wanted to add on a shop or other lean-to. The other thing is sealing the ends at the walls against insects, birds and the elements --I didn't see any weatherstip blocking, but I didn't look either.
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Roofing
The homes I've seen it and the steel roof either have a typical sheathed roof using OSB or 1/2" plywood. The others have a typical truss with purlins spaced every 24". I'd much rather use the plywood or OSB depending on cost for added stuctrual rigidity and keep out wind/rain/bugs/birds. I might be tempted to put down one row of tar paper along the eaves to help preserve the wood in case rain does get whipped up there.
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Roofing
Frank, that's the same question I asked a contractor. The response was there shouldn't be moisture between the steel and wood. The moisture, if any like any other ordinary roof would be on the bottom side of the sheathing. But then I saw another contractor using 1x3 battens or nailer strips to space it off the sheathing for ventilation. err? So I asked him about the wind getting under it and ripping it off. He didn't feel it was a big deal. We'll see. He may be right because at a certian point the house may either blow or wash away in hurricane winds so having an intact roof is moot. And I agree with you about raining inside. A friend who used to build commercial buildings built his 10,000 sft shop without roof insulation and it rains inside. Asked him why he did that if he knew that was going to happen and he says, "Well... I'm cheap" 'nuf said.
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