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A concrete slab forms the bottom layer of most homes as well as outbuildings such as garages. The slab is made of reinforced concrete. Today, building slabs are put together with an insulating layer between the ground and the concrete to keep the slab from drawing heat from the home.
Since the slab is the bottom support of your home, a home inspector will check to see that it's solid and that any cracks are just superficial. Deep cracks in the slab, especially ones that are uneven, can indicate structural damage.