Polyurethane grouting involves the injection of expanding polyurethane to fill and seal cracks and voids and re-level slabs.

Polyurethane grouting illustration

Common uses

Create barriers to water flow
Fill voids
Re-level slabs
Seal cracks and joints


The polyurethane grout is injected under low pressure through or adjacent to a slab of foundation. The grout then expands to fill the crack or void.

Polyurethane grouts can be single or multi-component, and can require a reactant or react when encountering water.


Available with variations in viscosity, reaction time, reaction with water, expansion characteristic and flexibility of the reacted grout.