Quote:
Originally Posted by dad911
Make sure you have 3-4" of stone under the slab, with good drainage, and you won't have a problem. 6mil sheeting under slab, pver stone, seams sealed. Perforated 4" PVC pipe in the stone, stubbed outside if you are in a radon area.
If you're really anal, use rubber roofing/pond liner instead of plastic. But that is a ridiculous overkill.
Still, if you leave raw steel on concrete, it will rust. Concrete absorbs moisture/humidity. Perhaps sealing it will help.
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Rebar, if properly installed, will last a long time in concrete as it emtombed in the matrix with minimal access to air (oxygen).
He needs to avoid exposed ends or sides of the rebar, hence the need for chairs, properly spaced.
Also, once placed, the concrete mix needs to be vibrated to get the air bubbles out and not over worked on the surface.