Hi,
I was visiting my in-laws this weekend and decided to go for a walk in their moobahn. Came across a home being built, and it being Sunday and nobody around I poked my head in for a look. Place looked fine, quite big, but I noticed that they had begun putting the concrete slabs down across the beams, but they didn't put anything underneath it. I thought I had read on here before that sand was usually put between the floor and the earth below.