Attic Closed Cell Foam Insulation

Polyurethane foam spf insulation and we are frequently asked to march 2007 i jlc i 1 insulating unvented attics with spray foam closed cell polyurethane foam provides the insulation air barrier and vapor retarder necessary for an unvented attic assembly closed cell polyurethane foam provides the insulation air barrier. This medium density spray foam is a closed cell spray foam that is typically used where there is the need for r value insulation per inch possible. Open cell foam weighs 1 2 pound per cubic foot and closed cell weighs 2 lbs per cubic foot.

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Using spray foam insulation in an unvented attic application both low density open cell and medium density closed cell spray foam can be used in an unvented attic to provide the needed thermal resistance and airtightness.

Attic closed cell foam insulation.

Closed cell foam can also increase the racking. There is 300 difference there but the cost they give you is about a third difference and open cell foam at 12 inches will not give you the performance of 2 inches of closed. This type of spray foam offers the specific benefits of continuous insulation interior wall cavity fill and unvented attic applications. Insulating value and strength open cell foam has an r value of about 3 5 to 3 7 per inch while closed cell foam has an r value of about 6 per inch.

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