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rumenocity5 t1_j8zk7m2 wrote

No no no no. Never fiberglass in a basement. Never. Closed cell foam. Spray or sealed sheets.

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Raleford t1_j8zku0c wrote

This is probably the best recommendation, honestly. I've also heard of people doing foam board against the concrete and then batting over that.

I also second the other recommendation to see if there's code specific to your area since it is likely high moisture/humidity

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rumenocity5 t1_j90t50z wrote

The problem is that concrete is a huge thermal mass. Any change in humidity in the conditioned space will cause a surface effect on the concrete and adversely affect the fiberglass insulation and wood framing.

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woodprefect t1_j91970d wrote

I did that, but I used rockwool which is moisture resistant.

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