Floor air seal closed cell 1 75 lb.
How much closed cell foam in attic.
Open cell foam installed 2 inches deep typically has a perm rating of around 15 while closed cell foam typically has a perm rating around 1 perm for the same depth.
For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.
Intumescent coatings are not always needed to coat spray foam in the attic in order to meet code thermal barrier requirements.
This is more common with closed cell foam but it happens with open cell foam too.
Get free estimates from insulation contractors in your city.
Spray foam insulation costs 1 36 to 2 63 per square foot depending on if it s open or closed cell.
Enter your information into the spray foam insulation estimate calculator to determine how much foam you need for your project.
Normally in occupied areas all spray foam must be covered by a 15 minute thermal barrier such as thick drywall per code requirements in irc section 316 4 and ibc section 2603 4.
Roof top side flat roof closed cell 2 5 lb.
3 inch closed cell spray foam insulation get local cost.
Closed cell spray foam r values.
Since closed cell foam has a higher r value per inch installers generally spray 2 in walls and 3 in rooflines to meet the energy code requirements of r 13 and r 19 respectively.
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.
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.
Open cell foam weighs 1 2 pound per cubic foot and closed cell weighs 2 lbs per cubic foot.
The myth that open cell is more economical is bullshit.
Roof attic side open cell open cell 0 75 lb.
Closed cell 1 75 lb.
2 inch open cell spray foam insulation high.
But anything over r60 is probably overkill and not cost effective if using closed cell foam only 10 worth if done in open cell foam you could get to code minimum with there with 11 and with another 5 6 of blown fiberglass for igintion barrier you d be at r60.
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Cost to install spray foam insulation varies greatly by region and even by zip code.