Spray foam: manufacturer vs. codes
So I have a closed-cell two-part spray foam I was considering using in a small, hard-to-access part of my attic, about 160 SF. The mfr says the foam is NFPA-286 compliant, with flame spread 25 or less, and approves it for use without thermal barrier at heights up to 6 inches, depths of 2 inches, and no horizontal restriction.
Now normally, spray foam in this part of the attic would require an ignition barrier, I believe. Yet the mfr says it’s not necessary, from my reading, unless I’m off base. So two questions:
Would it make sense to use an ignition barrier anyway, which is more work/money, or is it overkill? I mean, it will still burn easily, right?
And also, how would anyone inspecting it down the road know it was an approved use?
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