Spray In The Attic

A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits but then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents.
Spray in the attic. The big disadvantage with spray foam is cost. The use of spray foam attic can present many potential problems especially when it comes to the improper installation of this material within this area of your home. If you don t have hvac and ducts in the attic spray foam on the roofline isn t really necessary. Spray foam offers the best attic insulation performance available.
Use canned minimally expanding spray foam daptex plus window door foam sealant 7 for 16 ounces. I d blow insulation on the attic floor after air sealing of course. The practice of foam insulating the attic has raised eyebrows in the building industry because standard roofing techniques call for the attic to be ventilated. They sport insulation values of approximately r 6 5 and r 3 6 per inch respectively.
Nothing unusual about that. Spray foam attic insulation. However in a vented attic situation it will become approximately 130 degrees in the summer. Choose from two types.
Closed cell and open cell aka 2 pound and pound respectively. It s generally 3 to 4 times what you ll pay for blown cellulose or fiberglass.