Chemical Grouting

Water finds its way through cracks and joints long before anyone notices, and the soil it carries with it goes with it. Chemical Grouting injects a low-viscosity resin, matched to the specific soil and water condition, directly into the ground to seal that path and rebuild strength from below, without excavation. Engineers, facility owners, and public agencies use it on tunnels, vaults, joints, and below-grade structures where water intrusion and weak soil threaten what's built above.

Problems Chemical Grouting Solves

Water intrusion and weak soil don't stay separate problems for long. Here's what they lead to if they're not sealed and stabilized.

Water infiltration through cracks, joints, and below-grade walls that erodes soil and undermines structures

Fine, granular soil losing strength as water continues to move through it

Groundwater finding its way around pipes, utilities, and annular spaces that weren't fully sealed at installation

Ongoing soil loss beneath slabs and structures that keeps the underlying problem growing

Key Signs You Need Chemical Grouting

Water and weak soil usually show themselves before a structure fails outright. Watch for these.

Water seeping through a below-grade wall, tunnel lining, or vault joint

Staining, efflorescence, or mineral buildup where water has been passing through concrete or masonry

Soil settling or washing out around a pipe, manhole, or utility penetration

A joint or annular space around a pipe that was never fully sealed at installation

Soft or eroding soil beneath a slab near a known water source

Persistent dampness in a below-grade space with no obvious surface cause

Benefits of Chemical Grouting

Why engineers and agencies choose Chemical Grouting for sealing and soil stabilization.

Matches the material to the problem instead of using one grout for everything. URETEK selects from acrylate gels, single-component polyurethanes, and urea-silicates depending on the soil type, water condition, and whether the goal is sealing, binding, or both.

Addresses water intrusion before it undermines a structure. Sealing the path water is taking through a joint, wall, or soil layer stops the erosion cycle that leads to voids and settlement.

Keeps occupied and operating sites undisturbed. On a deep excavation next to an occupied three-story building in Pelham, New York, URETEK's work resulted in no recordable settlement at the adjacent structure.

Results are tested, not assumed. Rising-head permeability testing before and after grouting confirmed a 95% reduction in groundwater infiltration on a wastewater treatment project near Lake Erie, Ohio.

The grout permeates soil pore spaces rather than displacing them. Unlike URETEK's expanding polymer used in Deep Injection, chemical grout flows into the natural pore spaces of fine and granular soil, binding the soil grains together into a watertight, stabilized mass.

Why Choose Chemical Grouting?

Chemical Grouting is the right call when the problem is water finding its way through a joint, wall, or granular soil layer, and the goal is sealing that path and stabilizing the soil around it using a material matched to the specific condition. It's built for tunnel and vault waterproofing, manhole and pipe joint sealing, below-grade leak repair, and groundwater cutoff around pipes and utilities.

It's not the right tool when the goal is a single, continuous vertical barrier along a defined excavation or floodwall line rather than treating a specific joint or leak; Curtain Grouting is the more precise fit for that line-item work, even though it often uses the same acrylate material. It also isn't the fit when soil needs to be displaced and densified for bearing capacity rather than sealed through permeation, which Compaction Grouting is built to do, or when the scale of the job calls for URETEK's core high-density polyurethane lifting settled structures, which is Deep Injection (UDI)'s role.

Chemical Grouting is often paired with Curtain Grouting on the same site when a project needs both targeted joint and leak sealing and a continuous groundwater barrier along an excavation line.