How does polyurethane crack injection work?

Concrete cracks often lead to water intrusion, eroding structures from the inside out. Contractors use the polyurethane crack injection process to seal these leaks permanently. This method excels at handling active leaks – where water is visibly flowing – and reacts with moisture for a quick, reliable cure. Follow these five steps for success.

Application

• Step 1 – Drill the Holes: Use a hammer drill to create a hole at a 45-degree angle. This intersects the crack halfway through, directing resin to both the front and back.

• Step 2 – Flush the Holes: Insert a flexible hose and pump clean water to the back of the hole, clearing drill dust until water runs clear. This prevents clogs and ensures smooth resin flow.

• Step 3 – Install the Ports: Insert an injection port to seal the hole and provide a secure pump connection.

• Step 4 – Flush the Crack: Inject water through the port to remove contaminants and add moisture for resin reaction. Skip if water is already flowing.

• Step 5 – Inject the Resin: Start with low pressure. Increase as needed. When the resin stops traveling, move to the next port. 

Benefits

• Superior Waterproofing and Sealing: Polyurethane foam expands upon contact with water to create a dense, watertight seal that effectively stops active leaks and prevents future water ingress.

• Flexibility to Accommodate Movement: The material remains flexible after curing, allowing it to move with the concrete as it expands and contracts, preventing the crack from reopening.

• Fast and Convenient Application: The injection process is typically quick to perform, and the material cures rapidly, minimizing disruption to the area.