Positioning a single layer of reinforcement in ... reinforcement may not be properly located in the slab. Support reinforcement with chairs or precast-concrete bar supports. Chairs should have ...

then cover the excavated area with a layer of sand before pouring the concrete. You'll need to smooth the entire surface of the freshly poured slab, then create grooves in it to act as control joints.

The concrete slab is often placed on a layer of sand for drainage or to act as a cushion. Houses built on a slab lack crawl ...