Attic Closed Cell Foam Under Blown Insulation

Spray foam attic insulation spray foam offers the best attic insulation performance available.

Attic closed cell foam under blown insulation.

Closed cell and open cell aka 2 pound and pound respectively. Earlier this year i got a question about a home that had spray foam insulation in the attic. Nothing unusual about that. Because it requires professional installation closed cell foam insulation is pricey but it offers r 6 thermal value for every inch of thickness.

They sport insulation values of approximately r 6 5 and r 3 6 per inch respectively. Homeowner james polk who recently hired sunlight contractors to install approximately 3000 square feet of spray polyurethane foam in his destrehan home describes his experience which is typical of a job done right. Open and closed cell foam insulation use a blowing agent to forms the cells within it. Closed cell foams use enovate also known as 245fa which is.

Open cell foams use water as a blowing agent. A properly done spray foam job not only insulates but also greatly reduces the air leakage of. However in a traditionally insulated attic insulation on the ceiling the attic is vented. The foam usually polyurethane is sprayed to fill cracks and gaps in the attic to form a hermetically sealed barrier.

One huge benefit of the spray foam insulated attic is that conditioned air leakage from the ac furnace duct system is contained and used to condition the attic. Properly applied by a professional spray foam should emit relatively low fumes that will altogether dissipate in about a week. Spray foam provides the highest r value while open cell spray foam has about an r value of 2 2 to 3 5 per inch closed cell spray foam has about 6 7 per inch. The evaluation service report esr for spray foam insulation products provides a valuable resource based on a third party review of testing information useful for utilizing these products successfully and according to code requirements.

Whereas blown in insulation works by filling the. Choose from two types. It really should be called spray foam insulation and air barrier. Once you deal with the air up there this problem goes away with or without the insulation in the attic floor.

When we seal the attic with spray foam it s as tight as a butter tub. 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.