Polyurethane crack injection is a highly effective method for stopping active water leaks in concrete structures, using specialized resins injected under pressure to seal cracks and prevent further water infiltration. This proven concrete waterproofing and leak repair solution is ideal for both structural and non-structural cracks in a wide range of applications.
At Corcon Construction Ltd., we specialize in professional crack injection services for underground parking garages, foundation walls, suspended slabs, concrete tunnels, elevator shafts, utility vaults, water treatment facilities, and concrete pools across the Greater Toronto Area.
This method is particularly effective for cast-in-place concrete walls and suspended slab systems, where water infiltration can lead to corrosion, deterioration, and long-term structural damage. When properly installed, polyurethane injection provides a durable, long-lasting, and cost-effective seal, making it one of the most efficient concrete leak repair methods available.
We utilize two primary types of polyurethane injection grouts, depending on project conditions:
- Hydrophobic Polyurethane Grout – Repels water, expands significantly upon contact, and cures into a rigid foam, ideal for sealing active, high-flow leaks.
- Hydrophilic Polyurethane Grout – Absorbs water, expands at a controlled rate, and cures into a flexible foam, ideal for fine cracks and areas requiring movement accommodation.
Both systems are water-activated and require active moisture or leaking conditions to properly expand and seal cracks, forming a watertight barrier within the concrete.
Corcon Construction delivers precision crack injection services using advanced equipment and proven techniques to ensure complete penetration and effective sealing. Our goal is to stop leaks at the source, prevent further deterioration, and extend the service life of your structure.
Polyurethane crack Injection consists of injecting leaking cracks with an epoxy resin at high pressure. This type of repair is most successful on cast-in-place concrete walls and suspended slabs. Polyurethane injections are commonly conducted in underground parking garages, water treatment plants, basement foundation walls, structural walls, concrete tunnels, elevator shafts, concrete utility vaults and concrete pools. This method of leak repair is the least expensive repair method while providing a permanent seal when properly injected into a crack.
There are two types of polyurethane grouts that are typically used, hydrophobic and hydrophilic. Hydrophobic grout repels, has high expansion, and cures rigid. Hydrophilic grout absorbs water, has lower expansion, and cures to a flexible foam. Both types require an actively leaking crack as they become activated by water.
TYPES OF INJECTION RESINS
Fast Foaming Injection Resin:
A solvent free, low viscosity, polyurethane based elastomeric resin.
Rigid Bonding Injection Resin:
A solvent free, low viscosity, epoxy-based Duromer resin.
Flexible Sealing Injection Resin:
Solvent free, low viscosity polyurethane based elastomeric resin.
Elastic Sealing Injection Resin:
A solvent free, low viscosity, acrylic based hydro structural resin.
