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How the Injection Process Works

Figure 1.   Foundation crack showing the crack is through the 8-inch thick wall and travels up from the concrete footing (lower left) to the top of the wall.

Figure 2.  The crack viewed from the inside.  Angle cracks are usually an indication the wall was hit while still “green” or heavy equipment got too close.  This does not affect the strength of the wall.

Figure 3.  The right crack is drilled out and the holes are washed out with water to remove any drilling debris that may clog the crack.

Figure 4.  Starting the injection process.  Note the brass injection ports.  The surface of the crack has been sealed with a hot glue gun to provide some backpressure to keep the material flowing up the crack.  Some leakage occurs under the seal.  Note the grease gun.  On smaller jobs, a grease gun is used to eliminate the need to clean up the equipment using hard to dispose solvents.  A grease gun can generate up to 2,000 psi, enough to crack the concrete.

Figure 5.  The injection process is complete.  The foam will be cleaned off the wall, the injection ports broken off and the hole filled with concrete patch.

Figure 6.  The completed repair.  The dark spots are the concrete patches over the drilled holes.  The patch is still wet and will dry to a lighter color and blend into the wall.