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Avoiding moisture sandwich

Badgerfan | Posted in General Questions on

I have spray foamed box sills in basement. Now im turning a sunroom into a finished four season room. The sunroom is cantilevered roughly 3ft off the ground. The outside area of foundation will need to be insulated but the very inside of that area is spray foamed. What are ways to add insulation on the exterior side there without creating issues? Im in WI.

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