![]() The grid of wires or bars helps protect the slab against cracking caused by concrete shrinkage during curing, temperature stresses, concentrated loads, frost heaving, or settlement of the ground beneath. A reinforcing mesh of welded wire is laid over the moisture barrier or crushed stone. ![]() Where the walls surround the slab to be poured, an isolation joint is created by inserting a compressible filler material. The top edge of the form is carefully leveled when the slab is poured, this edge will be used to guide the screed that levels the slab surface. A simple edge form - as strip of wood or metal fastened to stakes driven into the ground - is constructed around the perimeter and is coated with a form release compound to prevent the concrete from sticking. This acts as a drainage layer to keep moisture away from the underside of the slab. Next a layer 1 ½ inch diameter crushed stone at least 4 inches deep is compacted over the subsoil. TERMS IN THIS SET (15) Preparation process of slab on grade To prepare for the placement of a slab on grade, the unstable topsoil is scraped away to expose the subsoil beneath.
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