Structural · E-A4HXT

Slab on Grade Construction Joint

Elements

Floors / Slabs Expansion / Control Joints Waterproofing / Flashing

About this detail

A typical construction joint in a concrete slab on grade features a thickened slab profile. The joint includes a formed keyway with bullnose edges and smooth, greased dowels measuring three-quarters of an inch in diameter by two feet long spaced at twelve inches on center. A continuous vapor barrier runs underneath the thickened slab section, and additional reinforcing bars match the slab reinforcement. The exposed side of the key is coated with curing compound or form oil to break the bond between the new and previously poured concrete, and sandblasting is prohibited.

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