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colin294 t1_j65o34y wrote

Just buy the bat insulation for 2x6 walls and pull it in 1/2. It generally separates very cleanly along a cosistent plane. It does create a little more airbourne dust than cutting, but i would recommend wearing a proper ½ mask respirator anyway.

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Blackking203 OP t1_j674yis wrote

That's a good idea

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tahmorex t1_j689vpt wrote

Compressing the insulation reduces its R-value considerably.

I would use rigid foam board, take your time and cut to fit, and use a spray foam gap sealer (comes in a can) around the edges once it’s in.

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