SOFF CUTTING
Soff cutting (also called early-entry or “green” sawing) is the practice of making shallow control joints in freshly placed slabs before they fully cure. The aim is to control where cracks form as the concrete shrinks, reducing random, unsightly cracking and improving slab durability and appearance.
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Why it's done:
Crack control: Purpose-made joints guide shrinkage and thermal movement so cracks occur neatly within the cut, not randomly across the surface.
Quality and aesthetics: Proper joint layout prevents “map cracking,” improves finish quality, and enables decorative patterns when desired.
Soff Cutting
Cost and performance: Preventing uncontrolled cracking reduces future repairs and preserves structural and service performance, especially in large slabs and driveways.
Critical window: Cuts are typically made within the first few hours up to about 24 hours after placement—soon after the slab can support equipment without raveling but before significant shrinkage.
Timing
What affects timing: Water–cement ratio, slab thickness, aggregate gradation, curing/sealing practices, and ambient temperature all influence the optimal moment to cut; having a plan before the pour is vital.
Weather conditions: Warm weather accelerates set, shortening the window; cooler, damp conditions delay it.
