Epoxy injection
A repair in which low-viscosity epoxy is pumped into a crack under pressure, bonding the two faces back together and restoring structural continuity.
What does epoxy injection mean?
Epoxy injection is appropriate for dormant structural cracks in sound concrete, since the repaired section becomes as strong as the surrounding concrete. It is not appropriate for cracks that are still moving, which will simply crack again beside the repair, and it is not a solution for cracks caused by ongoing settlement or corrosion. Wet cracks require moisture-tolerant formulations and careful surface preparation.
In practice
Basement wall crack repair sold as injection is often flexible polyurethane for water control rather than structural epoxy, and the two do different jobs.