A challenge in any concrete wall application is preventing water from penetrating the assembly. The biggest liability is the cold joint between the footing and the cast-in-place wall. To best address this issue, the architect specified a combination of liquid adhesive and a spongy material applied to the adhesive. The material is designed to expand when it absorbs water. When concrete is cast over top of the waterstop, it creates a tight space that will not allow the waterstop to grow, so its expansion actually tightens the space creating a self-sealing effect, and therefore preventing water from slipping into the building.
Applying the liquid adhesive.
A keyway in the footing, a structural feature for the concrete wall to be placed, is an ideal place for the waterstop to be installed.
The spongy waterstop installed. When it tries to expand in its confined concrete housing (after the concrete in the wall is cured) it essentially tightens the space creating a self-sealing, water resistant assembly.
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