Formboard For Crawl Space Question

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Johnny Miller

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Looking to put a piece of foam board between the floor joists and then a strip on insulation. So it would be foam board against the sub floor then insulation. Better or worse as far as the insulation properties? A;lo thinking about putting a piece of foam board at the rim joist as well.

Thoughts or is the over kill?
 

Snoonyb

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Foam board is far easier to stabilize than batt insulation, so I would install the batts, with the vapor barrier toward the conditioned side, and then the foam, without a vapor barrier.
 

Johnny Miller

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Foam board is far easier to stabilize than batt insulation, so I would install the batts, with the vapor barrier toward the conditioned side, and then the foam, without a vapor barrier.
Thanks
 

oldognewtrick

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You should be carefull to not create a double vapor barrier. It can trap moisture and create a new set of issues.
 

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