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Crom1171 t1_j8zq8lt wrote

If those batts are just friction fit I would pull them out and fit rigid foam against the foundation and spray foam any seams and then if you want to you could put the batts back up followed by drywall. No need for poly. I recommend looking at fine homebuilding a website for more information

https://www.finehomebuilding.com/project-guides/insulation/build-a-risk-free-finished-basements

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rawspuds t1_j913i05 wrote

I’ll second this. In my 70’s home, had the benefit of having bare walls to start. I put up 2” poly iso board against the block wall, sealed gaps with spray foam and insulation tape, then framed in front of that and put in r-15. There is also a French drain installed. My basement is the warmest dryest part of the house now.

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