Spray Foam Roof Deck

Where wood shingles or shakes. Insulate an attic in an existing home by installing spray foam open cell or closed cell on the underside of the roof deck. The installation steps are as follows.

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It s not coming from above the roof and it s not some new moisture source resulting from the spray foam.

Spray foam roof deck.

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 foam will also contract and expand depending on the weather which again reduces cracks. Foam lok is spray applied to the roof s surface making it possible to vary the thickness of foam and ensure proper drainage. Inspect the existing roof shingles or roofing membrane for any deficiencies.

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

Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. This measure will convert a vented attic to a nonvented attic. Spray foam insulation applied on the underside of the roof deck in cold climate commercial buildings allows for a significant reduction in condensation potential particularly compared to interior air permeable batt systems. This results in extended life span.

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. As air impermeable insulation spray foam insulation can be used in such applications. Spray on roofs can also be levelled out more easily reducing the collection of water in ponds. Lstiburek takes blame for bad language.

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. Proper drainage prevents ponding water deck deflection and protects the roof from leaks and premature failures. With a spray on roof you can fill gaps seams and cracks in your existing roof construction giving you even more protection.

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