Insulation and soundproofing
Insulating below slab-on-grade floors
...insulation can be very quick if not instantaneous, as added material costs are offset by money saved monthly on heating.
The insulation we used here is Rockwool rigid board under the main slab and on the exterior of the slab, and high-density Type III EPS foam under the footing as Rockwool has not been tested yet for...