Specifies how much of the residence has a concrete slab floor. Enter either the slab area in square feet, or enter the percentage of the total floor area that is slab. Thickness of the slab varies with structural design characteristics of the building. Cost for reinforcing (either mesh or bars) is included.
Note: Be careful when making this entry for a multi-story residence. For example, the entry for a two-story residence with 2,000 square feet of total floor area that has a slab floor on the first story and a wood subfloor on the second story is either 1,000 square feet or 50%.