A concrete floor poured directly on the ground, used in warehouses, garages, and homes.
A concrete floor slab that is cast directly on prepared, compacted subgrade or base material at or near ground level. Slab-on-grade construction is common for warehouses, retail buildings, and residential construction where frost depth, soil conditions, and loads permit. The slab is typically reinforced with welded wire fabric or rebar and may include control joints to manage cracking.
Slab-on-grade scope ties together earthwork, vapor barrier, reinforcement, and concrete line items, so an estimator must coordinate several trades to price it accurately and avoid double-counting or gaps. The thickness, reinforcement, and base preparation called out in the structural drawings drive cost significantly, and assumptions about soil conditions or required compaction can expose the bid to risk if geotechnical requirements are missed.
Taking off a 40,000-square-foot warehouse floor, the estimator prices the slab by cubic yards of concrete plus square footage of welded wire reinforcement, vapor barrier, and fine grading, then flags a thickened edge detail at the dock walls as a separate quantity.
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