Insulation approach for an above ground sandstone wall
I am renovating a 1905 wood frame house in Pittsburgh, we have cold winters and hot summers. The basement for the house is sandstone and is above ground. Only the basement floor is below grade. The basement walls are probably 2′ thick. I want to insulate the basement, it will be heated as it will be living space. But I want to take advantage of the thermal mass of the walls so my thought is to add 2″ external rigid foam with some kind of siding on top of to keep water out. I’m wondering if anyone has experience with this approach, or a better idea? It’s weird not having an underground foundation.
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