inject grout structural leak repair

The Contractor’s Dilemma: Picking the Wrong Cure Time You inject grout into a basement wall crack, expecting it to set in 30 seconds—but it stays runny. Meanwhile, water keeps gushing in. Or worse: It hardens too fast, clogging your injection hose before reaching the leak. Sound familiar? The Science Behind Cure Speed Water-soluble PU grout comes in two lifesaving variants: 1. Fast-Set (20–90 seconds)✔ Best for: Gushing leaks, pressurized pipes, active water flow✔ Expansion: 10–15x (fills cracks tightly)✔ Use Case: A burst pipe in a hospital basement 2. Slow-Set (5–20 minutes)✔ Best for: Deep cracks, voids, or precision applications✔ Expansion: 3–5x (controlled spread for large gaps)✔ Use Case: A leaking underground parking garage slab Pro Tip: The "Layered Injection" Technique For large or deep cracks: First pass: Slow-set grout to fill the void Second pass: Fast-set grout to seal the surface Case Study: The Bridge That Couldn’t Be Shut Down A highway overpass leaked saltwater onto traffic below. Engineers used: Slow-set grout to fill internal voids Fast-set grout to seal surface cracksResult: Zero traffic disruption Leak stayed sealed for 5+ years The Takeaway Match the grout to the leak—or pay the price in callbacks.