Open Cell Spray Foam In Attic

Some spray foam manufactures have tested primer coating products that result in the formulation of a class ii vapor retarder directly on the surface of the open cell spray foam. While open cell spray foam seems relatively inexpensive its use on the underside of roof sheathing may require a protective layer of 1 2 inch drywall an interior vapor retarder and special hvac runs to condition the air in the attic. This makes the foam a softer more flexable material.

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Builders should consider these costs before specifying open cell spray foam.

Open cell spray foam in attic.

Creates a strong airtight seal. It s just a pathway. Closed cell foam can also increase the racking strength of attic walls which. Open cell foam is full of cells that aren t completely encapsulated.

The role of open cell spray foam. In other words the cells are deliberatly left open. Whereas too little spray foam insulation can leave for thermal bypass because of the complete lack of insulation in the attic. Open cell spray foam can also be used to create an unvented attic in cold climate zones provided code requirements for a vapor retarder are followed.

A spray insulation is referred to open cell or closed cell because of the difference between the small bubbles cells that make up the foam. 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. Spray foam is resistant to water. 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.

Moisture is also another huge issue when it comes to spray foam insulation in an attic. It has a relatively high vapor permeance 3 perms at a thickness of 6 allowing water vapor to migrate to the roof decking at night and back into the attic air in the daytime. Open cell spray foam insulation doesn t store the moisture. It has been said that insulating with spray foam insulation at the roof line will lead to moisture problems with the roof sheathing.

In climate zones 1 2 3 and 4 the use of open cell spray foam with their vapor permeable nature will allow the drying of roof sheathing and framing as diffusion allows moisture to pass through the spray foam out of sheathing and structural elements. This airtight seal helps to decrease homeowner costs including utility costs. Spray polyurethane foam is a strong expansive product that quickly works to seal various cracks and holes in your crawl space attic and walls. It s the wood decking that stores the moisture though.

Open cell foam weighs 1 2 pound per cubic foot and closed cell weighs 2 lbs per cubic foot.

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