Matching Grout Type to Specific Crack Scenarios

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