Skip to main content


Post-9/11 infrastructure repair: Chemical grout injection at World Trade Center 'bathtub' site

Permanently Seal Leaks in Concrete Structures

Concrete will crack – that is a fact. Despite advancements in today’s construction technologies, concrete structures continue to crack in unanticipated places due to settling of the structure and ground movement. Cracks normally fall into two of four categories: Static or Dynamic, and Structural or Non-structural. A static crack does not move, while a dynamic crack does; and structural cracks place the integrity of the structure in jeopardy, while non-structural cracks can be eyesores and allow water infiltration.

If the crack is static, non-structural, and does not leak, epoxies are great to restore design strength and structural integrity. However, when concrete shrinks, expands, and leaks, the use of polyurethane injection grouts to permanently seal active water leaks is the optimum product of choice for non-structural issues.

Reasons to Use Injection Grout

The use of injection grout is a proven method for stopping leaks. Here are some reasons why injection grouts are the material of choice to stop leaks in concrete structures:

  • Fills Cracks Completely – The appropriate polyurethane injection grout can permeate any crack that will allow water movement. The grout expands to provide a permanent, waterproof seal from inside-out, top to bottom.

  • Remains Flexible After Curing – Once cured, injection grouts maintain their flexibility which is vital in concrete repair. The grout’s flexibility accommodates the dynamic nature of concrete (thermal cycles).

  • Forms Permanent Seal – Properly applied, injection grouts form an adhesive bond, mechanical lock, and compressive seal. This prevents water from bypassing the cured grout’s seal.

  • Helps Prevent Rebar Swelling – Water and rebar do not mix. When rebar meets water, it can swell which can create additional cracking in concrete that can lead to structural failure. When injection grouts are properly applied, water contact with the reinforcing steel is stopped.

  • Safe to Use – Injection grouts are safe to install when handled according to Safety Data Sheet (SDS) instructions and using the proper safety equipment. Many of our injection grout products are NSF/ANSI/CAN 61: Drinking Water System Components – Health Effects certified, ensuring the product meets regulatory requirements for the United States and Canada. To find out more about which products are NSF/ANSI/CAN 61 certified, visit Injection Products.

Common Types of Projects:

  • Sub-Grade Structures
    • Basement Walls
    • Tanks and Vaults
    • Elevator Pits
    • Gas Mains
    • Parking Garages
    • Conduit Pipes
  • Tiebacks
  • Culvert Repairs
  • Bridges and DOT Repairs
  • Sound Walls
  • Foundation Walls / Flooring
    • Food Processing Plants
    • Industrial Warehouses
    • Commercial Buildings
    • Industrial Facilities
  • Control Joints - Small and Large
  • Seawalls and Piers
  • Steel Tanks
  • Tunnels
  • Dams - Concrete
  • Airports
    • Runways
    • Tunnels
    • Railways
  • Pre-Excavation / Soil Stabilization
  • Fish Hatcheries
  • Power Plants
  • Various other concrete structures