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Concrete Repair & Injection

Crack Injection: PU vs Epoxy Decision Guide

When to inject polyurethane foam, when to inject structural epoxy, and how to combine both for active and passive cracks in UAE concrete structures.

26 May 20266 min readTEXSA Engineering Team
Key takeaways
  1. 01PU foam for active water; epoxy for dry, stable cracks.
  2. 02Hybrid PU + epoxy is the gold-standard on leaking infrastructure joints.
  3. 03Crack width and movement dictate chemistry — not budget.
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Context

Crack injection is one of the most misunderstood concrete repair techniques. The wrong chemistry can make a leak worse — fast-foaming PU into a stable shrinkage crack creates voids; structural epoxy into an actively leaking joint never cures.

Active leak control — PU foam

Hydrophilic and hydrophobic PU foams react with water to expand and seal. Use them when water is visibly flowing and the structure cannot be drained.

Structural restoration — epoxy

Two-part low-viscosity epoxies bond crack faces and restore the original concrete capacity. Use them on dry, stable cracks 0.2–5 mm wide.

Tagscrack injectionpolyurethaneepoxyconcrete repair
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Written by
TEXSA Engineering Team
Waterproofing & Protective Coatings Specialists
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