A diy concrete slab depends on how large a slab you need. If you are building a relatively small slab for a storage shed or a patio, you can do it yourself. A large house sized slab should not be attempted by a novice. Begin the preparation by digging a 8" to 12" wide trench that is 4" deep all around the outside perimeter the slab area. Use 2' wide boards to build a perimeter border, making sure
. that are level to themselves and square. Drive stakes into the ground on the outside of the boards to hold them in place, driving the stakes just below the top of the boards edge. More instructions can be found here http://www.buildeazy.com/newplans/eazylist/concrete_slab.html.
