Injection ports, called packers, are drilled at an angle to intersect the crack or surface-mounted along it, then resin is pumped in under pressure. Polyurethane resins react with water and foam to seal active leaks and stay flexible; epoxy restores structural continuity in dry, dormant cracks. It is the standard negative-side repair for leaking walls, cold joints and tie holes.
Wall's weeping along that crack, drill packers every eight inches and pump the hydrophobic urethane.
Also heard as
- injection
- chemical grouting
- pressure injection
Related terms
Negative side
The interior face of a wall or slab, opposite the water, where waterproofing must resist water pushing it off.
Cold joint
The seam where one concrete pour meets a later one, a classic leak path in below-grade walls and slabs.
Waterstop
A strip cast into concrete joints to block water from traveling along the joint plane.
Crystalline waterproofing
A cementitious treatment whose chemicals grow insoluble crystals inside concrete pores and cracks to block water.