Can the concrete slab be eliminated in a super-insulated slab?
The Passive House Build designed by Steve Baczek has a 4″ concrete slab sandwiched between 10″ of foam below and 1 1/2″ of foam and p.t. 2 x 4 sleepers above. Featured in the Nov/2016 issue of JLC was a home designed by Mr. Baczek that had a basement floor that consisted of 2 layers of 3/4″ Advantech plywood subfloor over 6″ of foam. The 6″ of foam was above a 2″ layer of pea stone, which was above a 6″ layer of 3/4″ stone. Can a plywood/foam/compacted stone floor similar to this basement floor be used in a home with a concrete stem wall foundation that would typically have a floating slab on grade?