Quote Originally Posted by hemmjo View Post
I assume they are going to pour concrete over that system. Seems it would be more cost effective to form that with a boards which would allow closer rebar spacing, and reuse of the form boards. The cost of the clay filler would be eliminated. The system also puts the rebar closer to the top of the concrete slab rather the bottom where it would provide much more strength to a suspended slab.
Would the rebar placed nearer the bottom of the concrete slab not give the slab more strength, being in tension instead of compression near the top.