WebHighest rated in this set of products. ... Fire class of cured foam (DIN 4102-1) B3 : Volume Decrease % Up To - 2 : Post Expansion Time : 2-2, 5 : Flash Point Of Cured Foam : C Up to 400 : ... 5.0 out of 5 stars Excellent - this really is "great stuff" and … WebOct 15, 2024 · Michael Maines Oct 15, 2024 08:52am #1. Brian, I can't say how much you should worry about having spray foam around the chimney, but it's not code-compliant. The gap should be sealed with sheet metal and the space left clear. The gap around chimneys is usually a huge source of air leaks so it's definitely worth air-sealing it.
GREAT STUFF PRO Gaps & Cracks 24 oz Insulating Foam Sealant, …
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Great Stuff Foam Sealant Kit - Great Stuff Pro Gaps …
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