Structural · A-ZHVW9

Thermal Expansion Construction Joint

Materials

Concrete

Elements

Floors / Slabs Expansion / Control Joints Anchors / Embeds Reinforcing

Connections

Rebar Splice / Development Embed Plate

About this detail

A concrete slab thermal expansion construction joint details sequential placement stages between pour one and pour two. A typical dowel is embedded with one end greased and fitted with a plastic dowel cap, allowing horizontal movement across the joint. Two continuous number three reinforcing bars run parallel near the joint, separated by a two-inch clearance. A three-eighths-inch foam expansion joint material is positioned, held two inches below the top of the slab, with a double slip sheet placed underneath the concrete. Within twenty-four hours of placement, a two-and-a-half-inch deep by one-eighth-inch wide saw cut is made on pour two side only, followed by the installation of a one-half-inch backer rod. If required during open construction, the saw cut is re-chased to a quarter inch before installing the backer rod.

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