[bhoeger70]

3/8ths or 1/2 rebar on 2 foot centers, place the rebar on broke up cement blocks. I prefer to dig a 12x12 inch footing around the perimeter and put a 1 inch grade to the middle of the slab. Buy or rent the wire twister and use the prefabbed wire ties get the longer ones(6-8 inch I think). Also run at least 2 runs of rebar around the perimeter, cut some into four foot long chunks and bend them into a U shape then pound the ends into the ground around the perimeter at about 4-6 foot intervals and tie those two runs of rebar to those. Have enough poly around to cover the slab when you are done finishing it in case it rains.