Open Cell Vs Closed Cell Spray Foam Roof Humid Climate

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. Murmurs and hearsay about open cell spray foam insulation have been gaining traction for a while. 280dc uv protecting paint for foam. 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. Fire rated e84 kit 605 sf coverage.

In addition to the situation specific considerations there are more general considerations to make when deciding between open cell and closed cell foam. The role of open cell spray foam. Kit 105 sf coverage. We often compare the texture of open cell foam to a sponge or even angel food cake.

Closed cell spray foam on the other hand is also called medium density or 2 0 lb foam. It s just a pathway. 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. 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.

There is no wrong answer. Open cell spray foam insulation doesn t store the moisture. It rots roofs people have told me. So what is it with the family food fight.

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. Quick cure best seller kit 605 sf coverage best seller kit 205 sf coverage. On the interior side of any open cell spray foam installed on the underside of roof sheathing.

Kit 205 sf coverage. It s the wood decking that stores the moisture though. Low density open cell is better than high density closed cell or is it vice versa. Kit 60 sf coverage.

Closed cell foam is made up of cells that are as the name suggests completely closed. Folks i have got news for you regarding the open cell closed cell thing. Most open cell foam has. Spray polyurethane foam spf can do stuff that no other stuff can do.

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