Open Or Closed Cell Foam In Attic

For closed cell spray foam the r value is 12.

Open or closed cell foam in attic.

Spray foam lasts roughly 80 years before beginning to deteriorate. The insulation is blown into the wall or attic one layer 1 at a time. It s just a pathway. Light density open cell spray foam ocspf.

Medium density closed cell spray foam ccspf. 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. The myth that open cell is more economical is bullshit. The role of open cell spray foam.

Light density open cell spray foam is commonly known as half pound. 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 and closed cell foam are two different types of spray foam insulation. 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.

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. They have different strengths and weaknesses and one is not necessarily better than the other. 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 foam weighs 1 2 pound per cubic foot and closed cell weighs 2 lbs per cubic foot. How long does spray foam roofing last. Should i use spray foam insulation in my attic. It comes down to understanding the benefits of open cell vs closed cell foam and choosing the type that fits your needs.

Open cell spray foam insulation doesn t store the moisture. It s the wood decking that stores the moisture though. Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area. For an open cell the r value is 7.

Open cell spray foam insulation is a great choice for attics and the underside of the roof deck. Open and closed cell foam insulation use a blowing agent to forms the cells within it. Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me. Open cell foams use water as a blowing agent.

Id go with closed cell.