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Control and construction joints
How this node works
The control joint is a saw cut about a third of the depth: it weakens the section so the shrinkage crack forms straight beneath it, then it is sealed. At construction joints, greased dowels transfer the load while letting the slabs move.
Key points
- Concrete slab
- Control joint (saw cut ~1/3)
- Joint sealant
- Induced crack below the cut
- Construction joint
- Load-transfer dowel (greased one side)
Conceptual, language-neutral drawing for study and orientation — not an execution drawing. Dimensions and verifications belong to the designer.