Roof Deck Foam Insulation

Insulate an attic in an existing home by installing spray foam open cell or closed cell on the underside of the roof deck. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. Lstiburek takes blame for bad language.

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The installation steps are as follows.

Roof deck foam insulation.

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. Also the higher the indoor humidity the more insulation is needed to avoid condensation. As air impermeable insulation spray foam insulation can be used in such applications. 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.

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 ratio of insulation above the roof deck or air permeable insulation below the roof deck is a matter of climate and interior conditions. The spray foam can also serve as the thermal and vapor control layers in both new and retrofit construction. Generally more insulation is needed for condensation control in colder climates.

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. Inspect the existing roof shingles or roofing membrane for any deficiencies. It s not coming from above the roof and it s not some new moisture source resulting from the spray foam. This measure will convert a vented attic to a nonvented attic.

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