Insulate existing slab on grade vs. thermal mass
I’m remodeling a room that is built on a slab – it used to be the garage. The floor is currently plywood on 2×4 sleepers laid flat. The house was built in 1958, so I think it’s a safe bet that there’s no insulation under the slab (especially considering it’s former status of garage). I’m fairly certain that foam on top of the slab will help in winter, but I’m wondering if insulating the thermal mass afforded by the slab will make the room warmer in summer? And if I insulate, should it be the entire slab, or just the perimeter? I don’t have a good sense of the heat loss through the slab. Climate is northern Colorado.