WHY LOW-PRESSURE INJECTION?
Related Links: Why low-pressure injections is best Basic steps in the injection pocess Using epoxies vs. polyurethanes for repairing cracks Tools for crack injection: Advantages of dual-cartridge dispensers Do-it-yourself crack repair: A kit for homeowners Limitations of Low-Pressure Injection How to fix basement walls: Expert tips from Chris Sullivan 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.emecole.com for more information on low pressure crack injection. Find a Concrete Contractor 24 Services in 221 Metros -- U.S. and Canada 
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