Insulation Conundrum

I have an old house with a thick stone facade. The stone is at least 8 inches thick. When built(1938), they used Celotex(Homasote) for sheathing > 2 x 4 framing(real… I have an old house with a thick stone facade. The stone is at least 8 inches thick. When built(1938), they used Celotex(Homasote) for sheathing > 2 x 4 framing(real…Read MoreGreenBuildingAdvisor