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Insulating brick and block walls loosing minimal sq. ft.
I'm renovating a small cape cod home in Richmond, VA. The house is a 1950's brick and block structure. (4 x 8 x 16 block with brick venire) The home is stripped to studs and sub floors and we area adding 650 sq. ft. to the home. It origionally had furring strips attached to the block with no insulation.
My plan is to use Dow Corning's INSULPINK foam board 2' x 8' 1.5" foam panels. They are slotted to be held in place by 1" x 3" 's. (24" o.c.). Installed correctly, they add R-7.5 1" x 3" 's are on the long sides of the 2' x 8' foam panels so the 1" x 3" wood strip holds the two adjacent panels to the wall. It's separated from the block by ~1" of foam so thermal bridging is elimated. These strips then become the nailers for the Sheetrock screws.
Has anyone had experience with this product? Any other approaches to insulating a brick/block wall?