What is polyurethane crack injection?

Injecting polyurethane into cracks fills gaps in foundation concrete and masonry with a flexible expanding foam. The liquid polyurethane is pumped through small injection ports along the crack line, expands to fill voids, and hardens into a resilient seal that remains somewhat flexible as concrete settles and shifts with temperature and moisture changes.

The method differs from epoxy injection, which creates a rigid bond meant for structural repair of active cracks under load. Polyurethane is chosen primarily for waterproofing and preventing water infiltration through dormant or slowly-moving cracks where some flex in the repair is advantageous. The foam adapts to minor seasonal movement without fracturing, making it well-suited to Ohio's freeze-thaw climate where concrete expands and contracts seasonally.

Common applications in Trumbull County include basement wall cracks, foundation joints, and concrete floor penetrations where moisture entry is the primary concern rather than structural failure. The injection is typically done from the interior side, and the expanding polyurethane creates both a water-tight seal and a thermal break that can reduce energy loss through cracks.

Contractors performing this work need equipment to pressurize and dispense the polyurethane and skill in placing injection ports at proper intervals along the crack. Results are faster and less disruptive than excavation or exterior waterproofing, and the repair adapts better to minor ongoing movement than rigid alternatives. Find licensed foundation crack repair providers in your area for assessment and application.