Spray Foam Under Roof
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No interior class i vapor retarders e g plastic sheeting are installed on the ceiling side attic floor of the.
Spray foam under roof. Polyurethane or polystyrene spray foams can provide thorough coverage to roof rafters and attic walls in much less time than is needed for other materials. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. Lstiburek takes blame for bad language. I have not heard of any evidence to support your theory.
Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. This construction approach was first used in the 1970s and it has been implemented much more widely since it was first included in the international code council s icc model building code in 2007 irc section 806 4. The usual application of spray foam is to repair and re invigorate an existing roof by removing the saturated areas replacing with like materials and then spraying foam over top of the entire roof. Will re roofing damage foam under the roof.
How spray foam should be installed on the underside of the roof decking the unvented attic space is completely within the building s thermal envelope. This is a great question. Metal roofing manufacturers typically extend a 25 year warranty. Moisture generated indoors or that infiltrates into the home is responsible for the bulk of the moisture in an attic insulated with spray foam on the underside of the roof sheathing.
Both open cell and closed cell spray foam insulation adhears extremely well to the underside of roof decks and the rafters surrounding them when installed correctly. Where wood shingles or shakes. It will help you to eliminate problems that may come when the house becomes extremely cold in the winter and terribly hot in the summer. It s not coming from above the roof and it s not some new moisture source resulting from the spray foam.
The concern of manufacturer mbci is over who is going to verify that the foam will not cause corrosive damage over time to the roofing. The challenge comes when you combine systems spraying foam onto the metal roofing itself.
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