Open Or Closed Cell Foam In Attic

For an open cell the r value is 7.

Open or closed cell foam in attic.

Light density open cell spray foam is commonly known as half pound. Should i use spray foam insulation in my attic. Id go with closed cell. They have different strengths and weaknesses and one is not necessarily better than the other.

Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me. Medium density closed cell spray foam ccspf. It s the wood decking that stores the moisture though. The myth that open cell is more economical is bullshit.

Light density open cell spray foam ocspf. Open cell foam weighs 1 2 pound per cubic foot and closed cell weighs 2 lbs per cubic foot. 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. Open cell spray foam insulation is a great choice for attics and the underside of the roof deck.

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. Open and closed cell foam insulation use a blowing agent to forms the cells within it. Closed cell is denser better insulating. Open cell foams use water as a blowing agent.

Closed cell foams use enovate also known as 245fa. 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. The insulation is blown into the wall or attic one layer 1 at a time. 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.

Open and closed cell foam are two different types of spray foam insulation. How long does spray foam roofing last. 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. For closed cell spray foam the r value is 12.

It s just a pathway. Spray foam lasts roughly 80 years before beginning to deteriorate. 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. Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area.

Open cell spray foam insulation doesn t store the moisture.