Open Or Closed Cell Foam In Attic

Should i use spray foam insulation in my attic.

Open or closed cell foam in attic.

For closed cell spray foam the r value is 12. For an open cell the r value is 7. Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area. Light density open cell spray foam ocspf.

Closed cell is denser better insulating. The insulation is blown into the wall or attic one layer 1 at a time. Medium density closed cell spray foam ccspf. 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 spray foam insulation is a great choice for attics and the underside of the roof deck. 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. 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 and closed cell foam are two different types of spray foam insulation. The role of open cell spray foam. Open cell foam weighs 1 2 pound per cubic foot and closed cell weighs 2 lbs per cubic foot. 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. 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. Light density open cell spray foam is commonly known as half pound. Open cell foams use water as a blowing agent.

Spray foam lasts roughly 80 years before beginning to deteriorate. How long does spray foam roofing last. It comes down to understanding the benefits of open cell vs closed cell foam and choosing the type that fits your needs. Id go with closed cell.

Closed cell foams use enovate also known as 245fa. Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me. 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. They have different strengths and weaknesses and one is not necessarily better than the other.

Open cell spray foam insulation doesn t store the moisture.