below the finished concrete surface, as opposed to randomly throughout the slab. In indoor construction, crack fillers have evolved to transfer floor loads between slabs and protect the slab edges ...

a technique known as voided concrete utilizes empty spaces within concrete slab floors. Before the slab sets, workers insert air-filled cavities—ancients used empty terracotta blocks ...

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 spaces, and there is no space under the floor. If you are considering ...