1 2 Pound Foam Unvented Roof

Since i m attaching the foam to whatever siding is there i haven t ripped out the old insulation yet to take a look i don t know if i ll be able to create an airtight seal.

1 2 pound foam unvented roof.

Of cellulose insulation in the rafter cavities the roof shown here has an r value of approximately 63. Ccspf or closed cell medium density spray foam 2 pound or 2 pounds per cubic foot and ocspf or open cell low density spray foam half pound or 0 5 pcf. We re big fans of fine homebuilding. Deck for a thick roof rigid foam insulation installed above the roof assembly can create an energy smart roof.

The roof rafter space was assumed to be filled with sufficient insulation to meet the 2009 irc code values based the doe zone listed in table 1. The project in question is a new single family dwelling. However i d need to have an airtight seal for the vb to be superfluous. Foam free don t stay stuck in the sci finightmare of foam foam foam.

Unvented roof space article 9 19 1 1. Insulating unvented roof assemblies. Your comment still stands though there should only be 1 airtight seal. Ocspf is 1 2 pound per cubic foot open cell spray polyurethane foam ccspf is 2 pound per cubic foot closed cell polyurethane foam.

1 pound spray foam insulation applied in attic. 5 1 2 inches can be filled or almost filled with 1 2 pound open cell foam or you can go with 3 to 4 inches of 2 pound closed cell foam. Unvented attics insulated with spray foam duration. Unvented roof assemblies should be insulated either with air impermeable insulation rigid foam or spray polyurethane foam or with a combination of foam and air permeable insulation.

A roof deck over habitable space is proposed to be insulated with two pound spray foam applied between the joists with no venting between the insulation and the underside of the sheathing. Polyisocyanurate insulation above the sheathing and approximately 91 4 in. With three layers of 11 2 in. There are currently two types of spray polyurethane foam spf insulation used in north american residential construction.

It was further assumed that a large enough rafter space was. 1 spray foam insulation applied to attic roof. We have the capabilities to spray and inject a variety of foam systems to achieve a high r value while providing both effective vapor and air barriers. Foam tech creates superior insulation and environmental control solutions by installing safe cost effective and environmentally friendly polyurethane foams.

Unvented roof assemblies are outlined in the. All of these materials are supported by quality assurance testing capabilities that. We agree that avoiding sheathing rot is critical and that air permeable insulation such as fiberglass or cellulose cannot be used alone.