Open Or Closed Cell Foam In Attic

Medium density closed cell spray foam ccspf.

Open or closed cell foam in attic.

Id go with closed cell. 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. Closed cell foams use enovate also known as 245fa.

Some even claim 5 5 of open cell is a air vapor barrier but i don. Their arguments are that when the roof leaks you can tell with open cell. This premiere insulation has many benefits including help with moisture and sound control and the ability to help lower heating and cooling bills. Light density open cell spray foam ocspf.

Open cell vs closed cell spray foam insulation in my attic user 7032327 posted in general questions on march 28 2018 10 52am i am insulation an old brick house with closed cell on the exterior walls and i am tying to decide between open or closed cell under the roof deck in the unvented attic. 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. I ve been reading the recent articles that show open cell can lead to roof decking deterioration from humidify coming up through the attic. Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me.

They have different strengths and weaknesses and one is not necessarily better than the other. Open cell foams use water as a blowing agent. Open and closed cell foam are two different types of spray foam insulation. 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.

Closed cell is denser better insulating. Locally the spray foam installers all recommend open cell. Icynene open cell and closed cell spray foam insulates and air seals in one step. 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. 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. Light density open cell spray foam is commonly known as half pound.

It comes down to understanding the benefits of open cell vs closed cell foam and choosing the type that fits your needs.