Spray Foam Insulation
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About
Is spray foam any good?
Good for direct on metal spraying.
Expensive but high R - [1]
Advantages
- Longer life - claimed 80 years vs usual 20 years [2]. But, undamaged fiberglass also asts 100 years [3]
- May form watertight seal but don't count on it, for example under PV panels?
Sourcing
- $1.2 per sf per R6 (1" thick) - [4]
Polyethylene Foam
Polyethylene foam - R15 at 50 cents/sf [5]