Spray Foam Under Roof Deck

Spf is not a greater risk under a roof deck than the risk associated with commercial compact flat roofs with multiple layers of insulation sandwiched between roof membranes and metal and wood structural decks. Spf is not a greater risk under a roof deck than the risk associated with sips. The biggest weak point in my opinion is that if there is a roof leak you won t find out until the wood is rotted.

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Ready for something else.

Spray foam under roof deck.

By encapsulating the attic and leaving the old insulation up there that filth is in your conditioned space. Yeah you probably still breathed some of it but not as much as you will now with spray foam on the roof deck. You may have odor problems. It s not coming from above the roof and it s not some new moisture source resulting from the spray foam.

It is not the end of the world. Spray foam under roof decks. The spray foam definitely has its merits. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls.

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. Just make sure you overdo your roof when the roof is installed. 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. Open cell spray polyurethane foam ocspf and closed cell spray polyurethane foam ccspf insulation sprayed to the underside of roof sheathing is a popular strategy for increasing roof insulation levels in all climate zones.

Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. Where wood shingles or shakes. 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. No interior class i vapor retarders e g plastic sheeting are installed on the ceiling side attic floor of the.

I ve done a lot of work in energy efficient building and design. 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. Lstiburek takes blame for bad language. Your indoor air quality may get worse.

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