1960s slab on grade home

We are renovating a small (21′ x 34′) 1960s slab on grade cottage in zone 3C. I’m sure it’s not insulated under the slab. I’m trying to decide how to… We are renovating a small (21′ x 34′) 1960s slab on grade cottage in zone 3C. I’m sure it’s not insulated under the slab. I’m trying to decide how to…Read MoreGreenBuildingAdvisor