15/09/2026
An expansion joint and a construction joint may both appear as gaps or interfaces in concrete, but their purpose is different.
An expansion joint is intentionally provided to allow relative movement between adjacent sections as the structure responds to temperature and other movement demands.
A construction joint is created because concrete is placed in separate stages. It marks the interface between an earlier pour and a subsequent pour, so its treatment depends on the structural and watertightness requirements of that location.
That difference matters before deciding on flexible sealant, backer rod, waterstop, reinforcement continuity or another joint-detailing approach.
First identify the job of the joint. Then specify the treatment.
Share this with your civil engineer, contractor or site team as a practical concrete-joint reference.
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