professional injection techniques

Beyond One-Size-Fits-All Solutions Many contractors make the mistake of using the same grout for every job, leading to callbacks and unhappy clients. The truth is: different cracks demand different solutions. Your Decision Matrix for Perfect Results Scenario 1: Hairline Cracks (0.1-1mm) Best Choice: Low-viscosity epoxy grout Why: Penetrates like water into microscopic spaces Cure Time: 6-8 hours Application Tip: Use gravity feed injection for complete penetration Scenario 2: Moving Cracks (Seasonal expansion/contraction) Best Choice: Flexible polyurethane grout Why: Moves with the structure (up to 300% elasticity) Cure Time: 2-4 hours Application Tip: Over-drill and sleeve injection points to allow movement Scenario 3: Water-Active Cracks Best Choice: Hydrophobic polyurethane grout Why: Expands upon water contact, creating a mechanical lock Cure Time: 1-3 minutes Application Tip: Inject during heaviest flow for maximum expansion Pro Tips for Flawless Execution Always test grout consistency before injection Maintain constant pressure between 100-300 PSI Document injection volumes for future reference Use UV-stable grouts for exterior applications