Stray Foam On Roof Deck

Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. With a spray on roof you can fill gaps seams and cracks in your existing roof construction giving you even more protection. Insulate an attic in an existing home by installing spray foam open cell or closed cell on the underside of the roof deck.

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Inspect the existing roof shingles or roofing membrane for any deficiencies.

Stray foam on roof deck.

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. Spray foam insulation in an unvented attic assembly has been one of the most researched and widely implemented innovations of recent years. This measure will convert a vented attic to a nonvented attic.

I spent quite some time last week convincing a local church that the job their roofer spray foam contractor there s a combo you ll like was proposing wouldn t work. 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. The proposal to insulate the underside of the roof with several inches of open cell foam had a serious flaw. The spray foam can also serve as the thermal and vapor control layers in both new and retrofit construction.

When the choice is made to insulate along the underside of the roof deck spray foams have advantages over other insulation types because of the ability of spray foams to effectively air seal complex assemblies. Applying closed cell spray insulation to the underside of a roof deck at the sheathing to truss connection can double or triple the strength of the assembly boosting the roof sheathing s resistance to wind uplift in a hurricane. It s not coming from above the roof and it s not some new moisture source resulting from the spray foam. Insulating and providing airtightness with spray foam at the underside of the roof as part of an unvented attic assembly will elevate such concerns.

The foam will also contract and expand depending on the weather which again reduces cracks. The new roof is sorely needed that part seemed ok. The installation steps are as follows. Lstiburek takes blame for bad language.

Spray on roofs can also be levelled out more easily reducing the collection of water in ponds.

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