Fiberglass insulation also produces less waste. When rigid foam is cut to size, it produces small pieces and thin sections that are virtually unusable. Fiberglass insulation can be torn off and ...

Use a color that matches your fiberglass as closely as possible. Typically one thin layer will accomplish ... because you need something that will cut through the topcoat as well as the stain ...

Avoid cutting the board with power tools ... Step 11: Fill the voids with a layer of thin-set mortar topped with fiberglass tape. Sand the mortar smooth and finish as desired.