There are several types of concrete masonry units (CMU or block) available on the market. One type is smooth-face block, which is a lower quality option that was typically used as a backer block behind the brick facade of a building. Due to its lower quality, we recommend treating it with an elastomeric waterproofing paint. These paints come in a variety of colors and textures to provide an additional layer of protection. Clear waterproofing materials can also be used on smooth-face block, but due to its porous nature, it would need to be treated frequently, making it less cost-effective.
Another type of CMU is split-face block, which is a higher quality option than smooth-face block. Although split-face block comes in different grades, we recommend treating it every 5-10 years. The length of time between treatments will depend on factors such as the grade of the block, weathering conditions, and the materials used. Factors such as where it is located, Environmental conditions like sun exposure, Rainfall and similar conditions will affect the lifetime of the treatment.