Spray Insulation Roof Deck

Your indoor air quality may get worse.

Spray insulation roof deck.

Rigid foam board is just above the roof deck or an exterior insulation option. The later is used in new construction as the interior board serves as an inner wall. This retrofit assembly is appropriate for homes with conditioned attics or where the retrofit is intended to create a conditioned attic. All spray foam insulation radiant barrier and other components of the roof deck must be installed in accordance with manufacturer s installation instructions.

Air permeable insulation applied to the under side of minimum r 10 air impermeable insula tion spray foam or rigid board which is applied directly to the underside of the roof deck. 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. 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. By encapsulating the attic and leaving the old insulation up there that filth is in your conditioned space.

This measure will convert a vented attic to a nonvented attic. Insulate an attic in an existing home by installing spray foam open cell or closed cell on the underside of the roof deck. It typically has 3 variations. Lstiburek takes blame for bad language.

The installation steps are as follows. Remove existing roofing and non adhered underlayment to expose roof sheathing. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. Install insulating sheathing above the roof deck on existing homes.

Yeah you probably still breathed some of it but not as much as you will now with spray foam on the roof deck. The last requirement is the installation of your shingles must be performed in strict accordance with the owens corning installation instructions. As air impermeable insulation spray foam insulation can be used in such applications. Air permeable insulation applied to the underside of the roof deck with minimum r 10 rigid insulation above the roof deck.

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. Inspect the existing roof shingles or roofing membrane for any deficiencies. The spray foam can also serve as the thermal and vapor control layers in both new and retrofit construction. 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.