Epoxy Crack Injection

An epoxy injection involves a relatively low pressure (450 psi) injection of epoxy through injection ports installed on the surface of the crack; these ports adhere to the crack through the use of a thixotropic paste which is an anchoring epoxy. This paste is also applied over the entire length of the crack and, in conjunction with the soil outside, serves to trap the epoxy within the crack so that the epoxy is contained over the entire length of the crack. The injected epoxy will bond the two sides of the crack back together, thereby sealing the crack permanently. In fact, the epoxy bond is stronger than the concrete itself! There is no drilling involved with an epoxy injection and odors are minimal. Most customers choose epoxy injection where they have the option between epoxy and polyurethane due to the excellent warranty offered with an epoxy injection and because it is considered to be a structural repair. An epoxy crack injection is carried out in two steps as follows:

Step One
During this step, the injection technician will gain access to the repair area from inside the home. Subsequently, the injection T-ports will be installed, and the crack/hole will be covered over with thixotropic paste. Crack preparation for an epoxy injection typically takes 30 minutes.

The paste must be allowed to cure for at least 30 - 45 minutes before the second step (the actual injection) can begin. Failure to allow the paste to fully cure can result in an imperfect injection. It should be noted that the paste (anchoring epoxy) will not adhere to a damp or wet surface; consequently, an epoxy injection is only possible if the surface of the wall is completely dry.

Step Two
It is during this step that epoxy is injected into the crack. Injection time varies with the width of the crack and generally takes 15-45 minutes per crack. As experts in crack injection, AquaGuard Injection & Waterproofing™ uses epoxies with differing viscosities as dictated by the characteristics of the crack. The technician begins the injection through the lowest port until epoxy appears in the port immediately above it. Then the lowest port is capped-off and epoxy is injected into 2nd lowest port. This process is repeated until epoxy comes out of the crack at the top of the foundation or until the crack has been filled up to grade.

Note: Several technical factors need to be taken into account to determine whether a leak should be injected using epoxy or polyurethane. Only our trained technicians can determine which injection is most suitable to your circumstances.

Tip: If you wish to test an epoxy repair using a garden hose you must wait at least 24 hours so as to not interfere with the curing of the epoxy.