PU injection is the better route when the repair problem is not only filling, but also crack penetration, void expansion or support recovery in wet conditions. In water-bearing cracks, leaking joints, contact loss under slabs and unstable support zones, cementitious or epoxy routes are not always the most practical first choice. A PU system can move quickly, react in place and reach irregular voids more easily.

ZRETE’s underwater-compatible PU route is built around two different jobsite needs. W-6 Polyurethane Injection Grout is the lead option for void filling, slab undersealing, leak sealing and support stabilization. AquaBond 40 NF is the non-foaming structural alternative for wet crack repair, dense injection and waterproofing plus strengthening.

When polyurethane is the right route

• Water-bearing cracks and leaking joints

• Void filling below slabs or rigid support layers

• Support recovery in pavements, basements and buried concrete

• Wet crack repair where expansion or non-foaming behavior matters

• Fast return-to-service repair zones

Recommended product matrix

Why this route works

• Good for irregular voids and water-bearing cracks

• Suitable when expansion or closed-cell filling is needed

• Can reduce downtime in rapid repair situations

• Provides a practical alternative where dense non-foaming injection is preferred

Typical applications

• Wet crack injection in basements, tunnels and buried structures

• Void filling and undersealing below slabs or rigid panels

• Leak sealing and support recovery in wet infrastructure zones

• Dense non-foaming structural injection in water-bearing repair areas

Get a project-specific recommendation

Tell us whether the main problem is crack leakage, hidden voids, slab support loss or the need for a dense non-foaming repair body. We will recommend whether W-6 or AquaBond 40 NF is the better PU route.