PU injection vs epoxy injection — when to use which

Both fill cracks — but they work differently. Choosing wrong wastes money.

PU (polyurethane) injection reacts with water to expand — ideal for active leaking cracks in basements and terraces. Epoxy injection bonds concrete structurally — used for dry structural cracks in columns and beams where strength restoration is needed. Many projects need both: PU to stop water, epoxy to restore capacity.