- Concrete Crack Repair Home
- Floor & Slab Crack Repair
- How crack injection works A cost effective permanent fix for basement leaks
- Low-Pressure Crack Injection (Basement Walls and Foundations)
- Do-it-yourself crack repair A kit for contractors and homeowners.
- Basic steps in the injection pocess Installing injection ports, sealing, epoxy vs. polyurethane, injection and port removal
- Allowable crack widths At what width does a crack become a problem?
- Related Information
- Concrete Repair General overview of concrete repair
- Concrete Patch Repairing cracks in concrete flatwork
- Foundation Repair Repairing a concrete foundation
- Find Crack Repair Products
WHY LOW-PRESSURE INJECTION?
The secret to effective crack injection, whether using epoxies or polyurethane foams, is gradual introduction of the liquid polymer into the crack at low pressures (20 to 40 psi). This method requires some patience, but it allows the applicator to monitor the injection process and ensure that the crack is completely filled. Incomplete injection of a crack is the most common reason for crack repair failure.
To fill a typical crack in a residential foundation wall, injecting at pressures above 40 psi may not be effective. At higher pressures, the liquid has enough force to overcome gravity and rise up the crack without filling the backside, which is typically narrower than the front of the crack. High-pressure injection is better suited for repairing cracks in very thick-walled structures or where a high volume of water flow must be stopped (such as dam repairs). See www.rhinocarbonfiber.com for more information on low pressure crack injection.