Xypex - How to Waterproof Concrete Block Walls (CMU)

Concrete Masonry Units, often referred to as CMU or Concrete Blocks, are a common building material used in many applications. Unfortunately, these materials have variable porosity which makes waterproofing them very difficult, sometimes requiring multiple call-backs to fully waterproof a structure. Due to the high variability in block, the following procedure is not guaranteed to provide a waterproof structure but, Xypex’s experience is that this assembly has a very high success rate in most filled-block installations. The following steps can be applied on the positive or, more commonly, the negative side to waterproof CMU walls.
The following steps can be applied on the positive or, more commonly, the negative side to waterproof CMU walls.