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.
Open cell spray foam on metal roof.
One would be if someone went on the cheap and used open cell spray foam rather than closed cell.
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.
Spray polyurethane foam insulation with metal.
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.
About open cell spray foam kits.
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.
There are some cases where i could see some challenges.
Closed cell foam provides better insulation than open cell and also functions as an air barrier.
Your metal roof expands when it s hot and contracts when it s cold.
Since spray foam is monolithic and closed cell it will create a watertight barrier over the entire metal roof.
It rots roofs people have told me.
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.
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.
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.
Versi foam open cell foam kits have a density of approximately 0 75 pounds per cubic foot.
Murmurs and hearsay about open cell spray foam insulation have been gaining traction for a while.