Open Or Closed Cell Foam In Attic

Medium density closed cell spray foam ccspf.

Open or closed cell foam in attic.

Open cell spray foam insulation doesn t store the moisture. It s expanding properties ensure that it covers every little crack and hole but even with that ability it still needs to be installed correctly. 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. Spray foam lasts roughly 80 years before beginning to deteriorate.

The role of open cell spray foam. Open cell spray foam insulation is a great choice for attics and the underside of the roof deck. 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.

Open and closed cell foam are two different types of spray foam insulation. Open cell foams use water as a blowing agent. Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area. The insulation is blown into the wall or attic one layer 1 at a time.

Light density open cell spray foam is commonly known as half pound. 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. How long does spray foam roofing last. Open cell foam weighs 1 2 pound per cubic foot and closed cell weighs 2 lbs per cubic foot.

For an open cell the r value is 7. It comes down to understanding the benefits of open cell vs closed cell foam and choosing the type that fits your needs. For closed cell spray foam the r value is 12. They have different strengths and weaknesses and one is not necessarily better than the other.

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. Should i use spray foam insulation in my attic. It s the wood decking that stores the moisture though. Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me.

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. The myth that open cell is more economical is bullshit. Closed cell is denser better insulating.

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.