Injection waterproofing is often used to fill and seal cracks and crevices. The material is most often made from a polyurethane compound. The compound is lightweight and expands up to twice its original size when applied to a surface. Many non-toxic and environmentally safe products are available at home improvement stores nationwide. Injection waterproofing is used mainly in foundation crack repairs.

In most foundation cracks, a polyurethane injection can seal the opening. In some smaller cracks it may be apparent that a sealant was used because it may be difficult to evenly inject the compound. Single caulking style cartridges and the dual side-by-side cartridge systems are the types of injection waterproofing compounds available for retail purchase. Both of these are manually injected and easy to pump.

When using an injection waterproofing method, it is important to keep the area dry. Temporarily block any flowing water to the area, and clean and dry the area as needed. Experts say that in the case of water flowing through a hole, you can temporarily caulk the hole with candle wax, modeling clay or plumbers putty. If the cracks are in narrow or hard-to-reach places, you can use a flexible hose attached to the injector nozzle.

Whatever waterproofing system your leakage problem requires, be sure to do your research. If you choose to make this a do-it-yourself project, make sure you know where your leaks are coming from and the proper method to repair them. When purchasing waterproofing materials you should make sure you are buying the appropriate product for your needs. The National Association of Waterproofing and Structural Repair Contractors (NAWSRC) has tons of information on waterproofing. Whether or not you decide to hire a contractor, this organization can help you from beginning to end.