Under slab insulation under new, modern net zero home in Chapel Hill. Code will allow you to put two inches of insulation within two feet of the foundation and leave all of the rest of your slab uninsulated. We believe that comfort and performance demand a more thoughtful approach. In this case there is 5" of two pound, termite treated EPS in the field, and 3 pound termite treated EPS in the footings. At the time of this photo, the insulation was not in place up against the perimeter of the foundation wall.