This photo was taken from my commercial site during the beginning phase of the school. The black material that has been sprayed on the CMU is waterproofing. Waterproofing can either be sprayed or rolled on; it just depends on the limitations around the site.
This waterproofing application actually is not a good job. You can see towards the upper right hand corner of the picture that there are voids within the WP coat. This can cause water to get into the concrete and if exposure is prolonged, then the integrity of the concrete can be jeopardized. Also, the FD wall is not necessarily smooth. The WP coat will again have a hard time of sealing the area due to the inconsistency of where it was applied.
-- So make sure that your surface area is 1)clean 2)smooth 3) ready for the WP coat to be applied. This will make sure that your WP will hold up to its intended use.
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