Open Cell Spray Foam On Metal Roof

If you use open cell spray foam on your roof rafters you should cover the finished application with a paint or sealant that retards water vapor. That s an important consideration because if there s a leak in the roofing or the ridge cap moisture could get trapped between the roof and the insulation. Most steel roofing is factory finish painted which adds yet another barrier surface in the interior primer paint coat which further isolates the steel from the spray foam.

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In warm climates zones 1 through 4 low density open cell spray foam insulation is the typical choice since it is vapor permeable and will allow drying of the exterior sheathing and roof framing if they happen to get wet via diffusion into the interior of the building.

Open cell spray foam on metal roof.

Your metal roof expands when it s hot and contracts when it s cold. Closed cell spray foam insulation has a tendency to fill voids and gaps because it doesn t expand as much as open cell insulation. 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. There are some cases where i could see some challenges.

About open cell spray foam kits. Closed cell foam differs from open cell in that it prevents water entry minimizes moisture vapor permeability and decreases air leakage making it the preferred insulation to apply to metal panels. Versi foam open cell foam kits have a density of approximately 0 75 pounds per cubic foot. Spray polyurethane foam insulation with metal.

Most of the time extreme heat shifts cause that leak. Closed cell foam provides better insulation than open cell and also functions as an air barrier. It rots roofs people have told me. Since spray foam is monolithic and closed cell it will create a watertight barrier over the entire metal roof.

One would be if someone went on the cheap and used open cell spray foam rather than closed cell. Murmurs and hearsay about open cell spray foam insulation have been gaining traction for a while. Other considerations to get the best performance out of spray foam insulation you must cover the roof rafters and surrounding areas as thoroughly as possible. It is 92 open cell and has an insulation r value of 4 lower than the other versi foam systems but still superior to some of the other commonly used insulation materials.

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