Foundation Crack Repair

Which Kit Should You Use. Polyurethane or Epoxy Injection?

FOR MOST POURED CONCRETE FOUNDATION REPAIRS - USE POLYURETHANE!– Most basement cracks are non-structural, have already stabilized and just need water leaks stopped or prevented. They are usually vertical, less than 1/4". There should be no signs of movement (such as a "vee" where the crack is larger at the top than the bottom). Such cracks are best repaired with expanding polyurethane polymer... Its flexibility allows for easier injection into foundation cracks. As the two-part polyurethane reacts inside the crack (the addition of water inside the crack will also benefit the reaction of the polyurethane), it expands 20-30 times its original size throughout the crack, literally moving throughout the crack, filling any void areas which previously had allowed water leakage.

For structural cracks, we recommend injection with epoxy for its added bonding strength. Horizontal cracks in the foundation, or wall cracks wider than a quarter of an inch are general hints that the crack may be structural. When the foundation's structural integrity is compromised by either a large/wide crack or the buildup of multiple cracks within the same area, the added strength of epoxy injection is necessary. With the injection of epoxy into a foundation crack, the result is a repaired crack with concrete that is bonded together, and now significantly stronger than the existing foundation wall.