Crack
InjectionLEAK-STOP · PU & EPOXY · FULL-DEPTH
An injection leak-sealing system for cracks that pass water or move. Ports are set along the crack and resin is driven full-depth under pressure — a flexible PU resin that reacts with water to swell and seal active leaks, or a rigid epoxy for dry structural cracks. The right chemistry is matched to the crack.
What is Crack Injection?
Crack injection is a pressure technique that drives a liquid resin through the full depth of a concrete crack to seal it — most often to stop a leak. Injection packers are set along the crack and resin is pumped in under pressure until it fills the fissure. For cracks that are actively passing water or that move, a flexible polyurethane (PU) resin is used: it reacts with the water, swells into the crack and forms a watertight seal. For dry, dormant structural cracks, a rigid epoxy is used instead. POLYZEN selects the chemistry per crack and delivers it as an Applied System.
How the Crack Is Sealed
A leaking crack is sealed from the inside — packers set, the right resin driven full-depth under pressure, then finished. Tap any stage to see its role.
Cure, Packer Removal & Finish
Once the resin has cured and the leak has stopped, the surface packers and any temporary seal are removed and the surface is made good. The crack is left sealed across its full depth. System values: Per TDS.
Delivered as a POLYZEN Applied System
This crack is sealed as a POLYZEN Applied System — surveyed, specified and installed turnkey by trained applicators using PU and epoxy injection resins, mechanical packers and pressure equipment. The resin chemistry and method are selected per crack: active or dormant, wet or dry, moving or static.
Match the Resin to the Crack
A leaking crack and a dry structural crack need opposite chemistries. Pour a rigid epoxy into a wet, moving crack and it will not seal; the leak finds its way around. POLYZEN's method starts with the diagnosis — is the crack active and wet, or dormant and dry — and selects a flexible water-reactive PU or a rigid epoxy accordingly, then injects it full-depth under pressure. The chemistry is matched to the crack. Performance is confirmed on the product TDS.
Resin chemistry, packer spacing and injection pressure are specified per crack after survey. Crack injection seals the crack itself; where the wider area needs protection a full waterproofing system is recommended. POLYZEN confirms finished values on the product TDS and does not publish fabricated figures.
The Application Process
Inspect & Diagnose
Assess water flow, movement and width, then choose the flexible PU or rigid epoxy chemistry.
Seal & Set Packers
Control the leak, temporarily seal the face, then drill and set packers along the crack.
Inject Under Pressure
Pump resin through the packers to full depth — PU swells to seal, epoxy fills and bonds.
Finish & Handover
Cure, remove packers, make good the surface, final inspection and written warranty.
System Specifications
| Property | Detail |
|---|---|
| System Type | Crack Injection (Leak-Sealing / Structural) |
| Delivery | POLYZEN Applied System (turnkey) |
| Method | Mechanical-packer pressure injection |
| Resin | Flexible PU (active/wet) · rigid epoxy (dry) |
| Crack Prep | Survey · surface seal · packer drilling |
| Application | Basements · retaining walls · tanks · slabs · joints |
| Function | Stops leaks · seals crack full-depth |
| Coverage / Values | Per Product TDS |
Ideal Applications
Download Technical Data
Applied & Warranted
Every POLYZEN crack-injection project is carried out by trained applicators and handed over after a final inspection and a written system warranty. Warranty terms are confirmed per crack type, water condition and project scope.
Frequently Asked Questions
Related Grouting & Repair Systems
Stop Every Leaking Crack.
Get a site survey, leak diagnosis and quote for PU and epoxy crack injection.