Open Or Closed Cell Foam In Attic

Open and closed cell foam are two different types of spray foam insulation.

Open or closed cell foam in attic.

Open cell foam weighs 1 2 pound per cubic foot and closed cell weighs 2 lbs per cubic foot. Closed cell is denser better insulating. Should i use spray foam insulation in my 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.

Id go with closed cell. It s the wood decking that stores the moisture though. This form of insulation is commonly known as two pound foam as it is a rigid insulating material that requires a thickness of 50 mm when applied in the home typically this foam s natural color is yellow when applied in insulation. Medium density closed cell spray foam ccspf.

The insulation is blown into the wall or attic one layer 1 at a time. The myth that open cell is more economical is bullshit. 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. 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.

Light density open cell spray foam ocspf. For an open cell the r value is 7. Light density open cell spray foam is commonly known as half pound. Open cell spray foam insulation doesn t store the moisture.

How long does spray foam roofing last. It s just a pathway. They have different strengths and weaknesses and one is not necessarily better than the other. Closed cell foams use enovate also known as 245fa.

Open and closed cell foam insulation use a blowing agent to forms the cells within it. Spray foam lasts roughly 80 years before beginning to deteriorate. Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area. 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.

Open cell has an r value of 3 7 and closed cell has an r value of 6 5 based per inch of installed spray foam. Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me. The role of open cell spray foam. For closed cell spray foam the r value is 12.

Open cell foams use water as a blowing agent.