- Cleaning the concrete wall is the first step when preparing to waterproof it. Scrubbing it with a wire brush removes the dirt and debris that prevents the sealant from adhering. A long-handled ice breaker helps remove loose material from the wall as well. Applying water to the wall after scraping it helps remove dust and film since waterproofing material does not stick to dirty concrete, according to the Concrete Network website. Allow the wall to dry thoroughly.
- For the waterproofing agent to properly work, the concrete wall must be free of damage and cracks. Concrete epoxy, or glue similar to household epoxies, is available for the do-it-yourself individual repairing damage. After the epoxy is inserted into the cracks, it bonds with the concrete and "welds" it back together in certain instances, as indicated by Ask the Builder's website.
- Waterproofing for concrete walls is commonly found in liquid form or as a powder that when combined with water creates a liquid. Applying the cement wall waterproofing membrane is accomplished with a paint brush or sprayer as directed by the manufacturer. The temperature and weather plays an important role in how well the agent bonds; therefore, confirm the temperature is above 45 degrees F before applying it. Also, the concrete wall must be shielded from the rain for several days.
- Depending on the manufacturer's recommendations, concrete sealant is required to cure, or set, to ensure it properly bonds to the concrete. Generally, at least two or three days is standard. However, some types of sealant may require up to 14 days or longer of curing.
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