The microscopic cells within open cell foam are just that open which give it a soft fluffy feeling.
Open cell vs closed cell spray foam roof humid climate.
Closed cell foam is much denser than open cell foam.
Murmurs and hearsay about open cell spray foam insulation have been gaining traction for a while.
Open cell spray foam insulation doesn t store the moisture.
The role of open cell spray foam.
For example closed cell foam is really the only option for residential roofing adhesive due to its strength characteristics.
The cells are pressed together so air and mositure are unable to get inside the foam.
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Closed cell foam is made up of cells that are as the name suggests completely closed.
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We often compare the texture of open cell foam to a sponge or even angel food cake.
Not long ago someone even told me that in florida roofing companies won t let their workers go up on roofs with open cell spray foam because the roofs are so spongy the guys fall right through.
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In addition to the situation specific considerations there are more general considerations to make when deciding between open cell and closed cell foam.
It rots roofs people have told me.
So what is it with the family food fight.
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Because the open cell structure allows some vapor to pass through open cell foam is a good choice in hot humid climates and under roof sheathing such as in conditioned attics where water vapor caught between insulation and sheathing could promote wood rot.
Low density open cell is better than high density closed cell or is it vice versa.
It s just a pathway.
Folks i have got news for you regarding the open cell closed cell thing.
Since vapor retarder paint wont work unless drywall is first installed on the interior side of the closed cell spray foam and since installing drywall is expensive most cold climate builders avoid the use of open cell spray foam in attics.
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There is no wrong answer.
Most open cell foam has.
On the interior side of any open cell spray foam installed on the underside of roof sheathing.
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.
Closed cell spray foam on the other hand is also called medium density or 2 0 lb foam.
It s the wood decking that stores the moisture though.
