How Much Closed Cell Foam In Attic

Open cell spray foam insulation is a great choice for attics and the underside of the roof deck.

How much closed cell foam in attic.

The insulation is blown into the wall or attic one layer 1 at a time. Intumescent coatings are not always needed to coat spray foam in the attic in order to meet code thermal barrier requirements. Use closed cell foam it green for attic rafters. For closed cell spray foam the r value is 12.

If you have questions about your attic give us a call at 1 800 516 0949. However when we seal and insulate your attic deck using lapolla odorless open cell spray foam you re protecting that attic from tortuous high temperatures. In just a few minutes you ll have the information you need to make a smart purchasing decision for your home. Should i use spray foam insulation in my attic.

Open cell foam weighs 1 2 pound per cubic foot and closed cell weighs 2 lbs per cubic foot. Closed cell spray foam r values. Open cell foam has an r value of about 3 5 to 3 7 per inch while closed cell foam has an r value of about 6 per inch. It s expanding properties ensure that it covers every little crack and hole but even with that ability it still needs to be installed correctly.

When using this spray foam insulation cost calculator it is generally a good idea to factor in about 10 extra spray foam insulation cost to account for over spray waste and yield variations due to your particular ambient conditions. Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used than batts. Normally in occupied areas all spray foam must be. Spray foam is available in two different types.

How long does spray foam roofing last. Depending on how close your calculated requirements are to the actual yield of the recommended kit size or quantity you may need more material to. Home if you need 3 inches of foam depth the price above would. The myth that open cell is more economical is bullshit.

The atlanta summer time attic is 130 140 degrees and i ve seen higher temperatures in tight restricted attics under certain conditions. For an open cell the r value is 7. Insulating value and strength. The average cost to have spray foam professionally installed is about 2 400 for a 1 600 sq.

Open cell spray foam which is usually 1 00 to 1 20 per square foot and closed cell spray foam which is about 1 25 to 1 50 per square foot 1 by 12 x 12 area of coverage. Spray foam lasts roughly 80 years before beginning to deteriorate. Closed cell foam can also add to the structural strength of the roof system which can make it a more appealing choice in locations that frequently endure high winds. There is 300 difference there but the cost they give you is about a third difference and open cell foam at 12 inches will not give you the performance of 2 inches of closed.

For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.