Dr. Fixit PU Plain Injection — Flexible Polyurethane Injection Grout for Crack Sealing (5 kg)

Active leakage stopping and permanent watertight sealing are two different requirements — and they need two different polyurethane injection systems. A foam-based PU injection expands rapidly to stop active water flow, which is exactly what an active leak situation demands. But once the flow is stopped, or in situations where the crack is damp rather than actively flowing, what the application needs next is a flexible, non-expanding polyurethane that cures into a permanently elastic seal — one that accommodates the natural movement of the structure without cracking or debonding over time.

Dr. Fixit PU Plain Injection from Dr. Fixit Waterproofing Solutions is a flexible polyurethane injection grout engineered for crack sealing, construction joint treatment and permanent watertight repair in concrete structures. Unlike expanding foam systems, the plain polyurethane formulation cures into a flexible, rubber-like seal that fills the crack geometry completely and moves with the structure — meaning it doesn't crack or pull away from the crack faces when the concrete undergoes thermal movement, minor settlement, or load-induced deflection.

This flexibility makes PU Plain Injection the appropriate specification for construction joints, expansion joints, and cracks in below-grade structures where movement is expected and a rigid repair would simply re-crack under the same conditions that caused the original damage. It is equally effective for treating dormant cracks — cracks that are no longer actively moving but need to be permanently sealed against future water ingress before a surface waterproofing treatment is applied.

For waterproofing of basements, tunnels, water retaining structures, underground car parks and below-grade walls where the repair needs to be watertight and permanently flexible rather than rigid and brittle — Dr. Fixit PU Plain Injection delivers the elastic polyurethane sealing performance that durable joint and crack treatment demands.

A construction chemical waterproofing solution from Dr. Fixit that seals permanently rather than just filling — PU Plain Injection is the flexible polyurethane injection grout specification for crack and joint treatment where movement accommodation is as important as watertightness.