There are various types CMU (Block) on the market.
One type is smooth face block. This is a lower quality type of CMU that was meant for backer block behind the brick facade of a building. Because of this we recommend having it treated with an elastomeric waterproofing paint. The waterproofing paint comes in a variety of colors and textures.
Smooth face can also be treated with the clear waterproofing materials, but because of its porosity, it will need to be treated frequently and would not be cost effective.
Another type of block is split face block. Split face block, although it comes in different grades, is a higher quality block than smooth face. Therefore, we recommend the treatment every 5 to 10 years. The length of time between treatments depend on the grade of the block, the weathering conditions and material used.
This is an example of Split Face block that we painted with a "Off-White" color.
This is Smooth Face before treatment.
This is Split Face before treatment.