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    Rumah | Basement Wall Crack Repair - Seal and Fill Foundation Voids With Epoxy Or Polyurethane Injection


    By Louis Cole
    When a homeowner thinks about waterproofing the basement, the immediate concern is the high cost that often comes with it. Typically, a basement wall crack is something that the homeowner will easily notice, but puts off addressing until it becomes a serious problem. Thankfully, a low cost and highly efficient solution exists for the repair of both leaking and structural cracks in poured foundations - low-pressure injection. This process has become the most practical concrete crack repair solution for basement waterproofing and foundation repair contractors throughout the United States and Canada. However, to a homeowner unfamiliar with crack injection, such a simple and effective process may sound too good to be true.

    The idea behind crack injection is to inject a liquid polymer (typically a two-part polyurethane or epoxy) into the crack. This process allows the material to travel throughout the void in the foundation, effectively filling the crack upon curing. Prior to injection, the crack is covered with a sealer (the best being an epoxy adhesive) to ensure that the injected material does not leak out the front of the crack.

    The crack injection process has given homeowners an affordable solution to a problem that has the potential to be quite lingering when not properly addressed. For example, in years past, the most common remedy for a leaking crack was to install an interior drain tile system or to excavate around the home - both requiring a significant amount of time and labor, resulting in high expenses to the homeowner. Crack injection not only is more cost effective, it is also an effective repair solution because it actually addresses the void areas that makes up the crack, unlike drain tile which only collects the leaking water while allowing the crack to remain open.

    One of the most common questions has to do with the injection material - which is better suited for foundation crack repair? Both polyurethane and epoxy work well, but there are specific parameters in which one material would be preferred in place of the other.

    Most cracks form as a result of shrinkage - typically, it is not a matter of if, but a matter of when a foundation crack will begin to leak water. When a crack does not appear to be structural related, I have always recommended polyurethane. As a result of contact with water, polyurethane has the ability to expand anywhere from six to 30 times its initial volume (expansion rate depends on the manufacturer and the type of polyurethane). The result of the expansion makes the injection process more user-friendly for the applicator - as the urethane expands, the foam is essentially filling any void areas inside the foundation. With epoxy, it generally takes significantly more material than urethane to repair the same crack because epoxy does not have the same expansion capability.

    The use of epoxy is necessary for structural related cracks in the foundation. With the injection of epoxy, the repaired crack essentially becomes significantly stronger than the surrounding area - the added strength of epoxy becomes vital for such repairs. Pending the severity of the structural problem, additional reinforcement products may be necessary to ensure that further movement or settling does not create additional cracks around the repaired crack.

    Before one commits to a foundation repair using crack injection, the applicator should consult with a credible supplier to ensure familiarity with appropriate curing times of materials and correct use of all components. For example, when purchasing a two-part component epoxy or polyurethane, its viscosity will determine which size mixing nozzle will best accommodate the injection of material. The capability of the materials reacting properly is critical - does the supplier guarantee that materials meet manufacturer specifications? A supplier (either a distributor or a manufacturer) should be openly available and honest to ensure that the contractor is best serving his customers.

    Crack injection has been used by waterproofing and foundation repair professionals for more than 20 years. It has proved to be a highly efficient and low cost solution for homeowners, while providing contractors a viable business endeavor. Not all things in life are too good to be true.

    Lou Cole is the founder and president of Emecole, Inc., a manufacturer of concrete repair epoxies and polyurethanes since 1987. Since then, Emecole has become a trusted name for contractors throughout the United States and Canada for all of their basement waterproofing and crawl space repair needs. For additional information on how Emecole's waterproofing and indoor air quality solutions can work for you, call (800)-844-2713 or visit http://www.emecole.com.

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