Spray Foam Insulation Roof Details

This fully adhered self flashing system is seamless and seals all penetrations with no joints or fasteners.

Spray foam insulation roof details.

A layer of spray polyurethane foam can be installed against the underside of the roof sheathing with the rest of the rafter cavity filled with air permeable insulation. Spfa 147 spray polyurethane foam for hybrid insulation systems part 2. You must meet the same minimum code requirements for the spray foam layer and the total assembly as for the rigid foam plus air permeable insulation approach. Save thousands on re roofing with a tried tested and guaranteed insulation improvement for your home our spray foam solutions are designed to be 5 open cell.

Open cell and closed cell. Spray foam insulation also called spray foam or spray polyurethane foam spf is an alternative to traditional building insulation. Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. 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.

Creating a breathable atmosphere and allowing sufficient air flow and movement in your roof. Abaa closed cell spray foam. It s not coming from above the roof and it s not some new moisture source resulting from the spray foam. Serving as both an air sealant and an insulator spray foam is estimated to reduce the standard hvac sizing by about 35 on average.

There are two types of spray foam. According to the us environmental protection agency epa spray foam is recognized as a premier alternative to the batt insulation of years past. Roof to wall joint. Lstiburek takes blame for bad language.

After cleaning the existing roof the spf roof can be applied directly over asphalt shingles concrete metal and wood. 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. Spf roofs are installed by spraying a liquid on the existing roof and allowing it to expand into a foam. Hybrid insulation systems covered in this document include the use of medium density closed cell spray foam for insulation and air sealing in combination with air and moisture permeable insulations.