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Structuralaka: SOGaka: on-grade slabaka: ground-supported slab

Slab-on-Grade

In Plain English

A concrete floor poured directly on the ground, used in warehouses, garages, and homes.

Definition

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.

Example

The 6-inch slab-on-grade is reinforced with #4 bars at 18 inches each way and includes saw-cut control joints at 15-foot intervals.

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