When building stem walls, block courses on footings are set below grade and reinforced with rebar before concrete is poured in a continuous pour for a seamless, integral slab.

The problem with existing concrete structures lies in the steel rebar rods that are embedded within them for support. As these rust over time, the rust occupies more space than the original non ...

Plumbers won’t always know the depth of the concrete, whether rebar or tension cables are incorporated in it or what surface – sand, rocks or a ledge – is beneath it.