Expansion Joint Cutting
Expansion (control) joints are shallow cuts made into concrete to manage where natural cracking occurs as the slab moves and cures, and to separate sections that need to expand independently.
How it works
Control joints (often called expansion joints) are shallow cuts made into a slab so the natural cracking as concrete cures and moves happens along a neat, planned line rather than randomly across the surface. They're typically cut to about a quarter of the slab's depth, in a pattern suited to the slab's size and shape.
Timing matters on a new pour, joints are cut once the slab is firm enough not to ravel, but before uncontrolled cracking starts. Joints can also be retrofitted into existing concrete that's showing early signs of movement.
Common applications
- New slab pours requiring control joints
- Retrofitting joints into existing concrete showing early cracking
- Separating new work from existing structures
Need expansion joint cutting?
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