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foil faced vapor barrier under metal roof
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Posted by Tim, Ohio on October 31, 2006 at 07:35:31 from (128.146.239.246):
Hello Everyone, I am currently building my pole building, and have a little conflict of opinions concerning the foil vapor barrier. The building came as a package. A vapor barrier was supplied as part of the roofing materials. It is white on one side and has a foil face on the other. The company says I should install it with the foil side facing the metal. It should be pulled tight across the purlins, then temporarily stapled in place. The steel will lay directly on it. Out of curiosity I searched the web for information about the installation and found a variety of ways which conflict with the company's approach. Some information leads one to believe the foil should face down into the building. Some installations have the stuff being draped over the purlins so that it sags a bit to create an air space. Most say the direction of the foil does not matter, but that by turning it down, towards the inside of the building, it will not get dirty. Since, once it gets dirty, it will no longer function as a radiant insulation. At this time, I intend to just leave this building uninsulated. So, this barrier is intended to keep the metal from sweating and dripping. If there is anyone out there with any good experience please let me know what you think. Best regards, Tim, Ohio
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