Definition
A post-tension slab uses steel cables under tension to control cracking, particularly important in areas with expansive clay soils. Post-tensioning resists cracking better than standard slabs. Installation requires specialized engineers.
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Find my pathAbout this term
Post-tensioning involves embedding steel cables in the concrete slab and tensioning them after curing. This technique controls slab movement from soil expansion/contraction, particularly important in areas with clay soils subject to seasonal moisture changes. Post-tension slabs resist cracking better than standard slabs. Installation requires specialized engineers and certification. Repair costs are higher due to complexity. Common in Texas, Arizona, and other areas with expansive clay.
Pro Tip
In areas with expansive soils, post-tension slabs are worth the extra cost. They prevent costly cracking and foundation movement.
Example
A home built on expansive clay soil uses a post-tension slab with engineered cable spacing to accommodate soil movement and prevent differential settling.