Do I really have to insulate my basement slab?
I am finishing my 1940 basement, with 2 inches of rigid foam on the walls, covered with sheet rock.
My question: should I really insulate the floor? If so, is it avoid condensation on the slab, or because of heat loss?
There’s not a lot of headroom, which is why I’m reluctant to insulate the slab. And if I do, can I get away with 1/2 rigid foam instead of 1″?