Should slab on grade be insulated?
Should slab on grade be insulated? The most significant heat loss from the slab-on-grade occurs in the perimeter band of soil immediately adjacent to the building. By strategically placing insulation in the ground, this heat loss can be used to keep the slab from freezing and heaving. When might you require insulation beneath a slab on grade? The reason we build basements and stay 4 to 5 feet below grade is to avoid frost heave, using dirt to insulate. With a slab-on-grade, the difference is you use 'insulation' to insulate, rather than dirt. This effectively moves the frost line from...