Polyurethane crack injection is without a doubt the most effective leaking crack repair method in concrete. The widespread use of polyurethane, sometimes referred to as urethane or grout, for concrete crack injection is a tribute to the inherent versatility of low viscosity polyurethane injection resins for leak sealing applications. Polyurethane crack injection is commonly used in civil, commercial and residential applications.

CPR Services offer structural leak repairs with Crack Injection in Sydney and Melbourne on domestic/residential, commercial and civil constructions and sites. As each region’s climate may vary from one location to another, we find that Sydney residential and domestic structures and properties are typically in more urgent need for crack injection during the wet season. At the same time, we are the most recognised and engaged for crack injection work on civil and commercial structures in both, Melbourne and Sydney. We are well equipped to handle Leaking Crack Injection regardless of the size of the project.

Water ingress is when water leaks into a building or a structure. This can occur through floor and wall cracks and is viewed as a serious defect as it can cause serious structural problems, both, immediate and in the future. If your building or structure is affected by such leaks, we recommend that you contact us to discuss the repair by way of Crack Injection. Some of the problems and protective processes Crack Injection is best to address and remedy include:

  • Leaking Basement Ceilings and Floors;
  • Floor and Wall Cracks;
  • Waterproofing (Water Proofing);
  • Leaking Balcony Floors;
  • Leaking Cracks commonly noticed in Basement and Underground Parking Spaces in Civil and Commercial Building;
  • All other cracks through which water may be leaking.

Properties of polyurethane

Polyurethane is a fluid resin which is injected into concrete cracks, rock fissures, expansion joints and other voids in concrete structures. When used in concrete crack injection applications the polyurethane is injected into a crack; within minutes the polyurethane undergoes a chemical transformation from a liquid to a solid.
The versatility, and consequently the popularity, of polyurethane resins in crack injection applications stems from polyurethane’s properties:

  • It has a very short cure time, making it ideal for active leak sealing.
  • Extremely low viscosity allowing for even the finest fishers (cracks with a width less than 0.2mm) to be sealed.
  • The resin cures normally whether a foundation crack is wet, actively leaking, or damp.
  • There are literally thousands of polyurethane resin formulations which is useful when repairing foundation cracks because the viscosity of the resin and cure time can be controlled; CPR Services only used the best of these resins.
  • Polyurethane, once cured, can be quite flexible, allowing for movement in the structure and leak leaks to remain sealed.
  • Any leak in a concrete structure can be sealed.

Polyurethane crack injection is used in Civil Construction and maintenance of Civil Assets due to its flexibility in application and its reliability in repairing cracks and damage in concrete structures. Polyurethane crack injection is the most efficient and cost effective method in repairing leaking cracks in major concrete assets.
Applications include:

  • Civil Water – treatment plants, town water supply, pump stations, channels, canals
  • Sewage Treatment Plants – high voltage electrical pits, man holes, chemical storage areas
  • Dams – diversion tunnels, dam walls, permanent plugs, dam walls, weirs
  • Tunnels – rail, road, access and electrical
  • Underground Structures

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