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Exterior has a 1 2 thick drainage board and building paper against the sheathing where the thinstone veneer is attached to this specialized system designed for stone.
Open cell foam on attic floor. The entire home has open cell foam and there s no attic with a complete vapor barrier. But a common reason to put spray foam on the roofline is to avoid having to air seal the attic floor. I am considering a local icynene contractor for the work. This type of spray polyurethane foam can be classified into two different types.
Open and closed cell foam insulation use a blowing agent to forms the cells within it. Open cell foams use water as a blowing agent. Thus the air in the attic is connected with the air in the house. If you leave the insulation in the attic floor after insulating the roofline the attic will be cooler in winter than if you remove the insulation.
The attic is now much warmer than outdoors in winter but significantly cooler than the living space if you leave the old insulation in the attic floor. Next another form of insulation such as fiberglass is added to bring the total r value to desired level. The spray foam insulation or spray polyurethane foam spf is a popular alternative to traditional building insulation such as fiberglass. Closed cell foams use enovate also known as 245fa.
Would open cell spray foam be the best way to insulate it. But now after spray foam the attic isn t vented to outdoors. Plus he can better insulate the ducts and small furnace room with the ocsf. The home builder used 1 2 polyisocyanurate as an interior vapor barrier under 1 2 drywall.
About 3 4 of the ranch level of the home has a 13 ft ceiling with the rest 1 4 9 ft. A recommended technician says that we will be better off with the foam due to its air sealing properties. This spray foam is applied as a low or high pressure two component polyurethane spray foam that can be applied onto walls in unvented attics to ducts and ceilings and in vented attics and. I am considering having the r45 blown cellulose on the attic floor removed and replaced with r30 open cell spray foam ocsf.
Light density open cell spray foam insulation and medium density closed cell spray foam insulation. That makes the surface of the spray foam colder and most likely even below the dew point. So there s a knee wall in the attic where the ceiling height drops down. In the hybrid application a layer of closed cell foam is first sprayed on the bottom of the floor to provide an air seal.
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