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I have glass block windows with a small open vent in the middle of them in my basement. Trying to figure out how to proof them as the cavitiy is only 3/4" deep. I was wondering if that sound putty would work spread over the whole window then maybe 1/2" moisture resistant drywall over that sealed with acoustic sealant. Over that is going to be 2" xps rigid foam board directly on the concrete wall then studded with bats in between then DD+GG.