Slab-on-grade
A slab-on-grade is a concrete floor poured directly on prepared ground rather than over a crawl space or basement.
A slab-on-grade is a concrete floor poured directly on prepared ground rather than over a crawl space or basement.
Definition
A slab-on-grade is a ground-supported concrete floor, often thickened at the edges, poured over compacted fill and a moisture barrier.
A plain example
Illustrative example only: the crew compacts a gravel base, lays a polyethylene sheet, places reinforcement on chairs and pours the slab, then cuts joints so cracking follows planned lines.
Why it matters
The slab is both a floor and, in many designs, part of the foundation. Poor base preparation or missing moisture protection shows up later as cracks or damp floors.
Common confusion
It is not a screed. A screed is a thinner finishing layer placed on top of a structural slab or insulation.
On a project
Confirm base material and compaction, vapor protection, joint layout, edge insulation if required and the curing method with the drawings.
Quick answers
- What goes under a slab? Usually compacted granular fill and a vapor retarder, as the design specifies.
- Why are joints cut? To control where shrinkage cracks form.
- When can I install flooring? After the concrete has cured and its moisture level is tested to the flooring maker's limit.
Related terms
Always check the project drawings and specification, and confirm requirements with the engineer of record and the local authority.
Questions people ask
What goes under a slab?
Usually compacted granular fill and a vapor retarder, as the design specifies.
Why are joints cut?
To control where shrinkage cracks form.
When can I install flooring?
After the concrete has cured and its moisture level is tested to the flooring maker's limit.
Sources and further reading
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