Cracks in poured concrete foundation walls are caused by a number of factors. The most common is rapid concrete curing during construction followed by differential foundation settlement.
A crack in a poured concrete wall is a water infiltration concern and rarely a structural one.
A high pressure injection system is used to fill the cracks. This procedure involves drilling small holes approx. 2/3 of wall thickness deep at 3" intervals along the entire length of crack. Ports are glued and hammered into the drilled holes and a special fitting is screwed into the port.
There are two different types of injectable materials:
Polyurethane is activated and injected into the crack through the port under high pressure. During the curing process, the polyurethane expands approximately ten times its original volume creating a watertight gasket seal.
Epoxy is used instead of polyurethane when a crack or cracks are determined to compromise the structural integrity of a poured concrete foundation wall. This procedure is the same as polyurethane except the injected material is an epoxy resin.
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