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Old 11-19-2015, 10:02 AM   #1
Almost There
Join Date: Jun 2015
Location: VA
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Spray foam floor?

I'm planning on doing my walls and ceiling in closed cell spray foam. In a house application, spray foam is usually applied underneath the floor in the crawlspace. What I'm wondering about is if I can use it instead of foam boards on the floor.

Frame the floor, spray foam, put plywood subfloor down, then the top floor?
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Old 11-19-2015, 10:06 AM   #2
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For walls and ceiling, spray foam is the best.

Don't use spray foam on the floor. No need.

Rigid Styrofoam (Blue or pink Stuff) is 30% cheaper and will do a better job on the floor.

Build the floor like Jake C did. Starts on page 2. Best method I have seen.

"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."

Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization
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Old 11-19-2015, 10:21 AM   #3
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There is closed cell foam designed to be poured if you decide to go that route on your floor. It's what they use for boat flotation and works well for insulation.
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