Does solid grouting of your cells in a masonry wall help to reduce the movement of water and water vapor through the wall?
The short answer is yes but not by much and it is not discussed as a way to water proof masonry walls. Integral waterproofing agents in the block, concave tooled mortar joints, exterior sealants applied to the block face, weeps and flashing and control of cracking by properly placed control joints are the prescribed methods of limiting water and vapor movement through the wall. Solid grouting can improve the structural capacity of your wall but improvement of water tightness is not an acknowledged benefit. There are just too many other more effective and less costly ways to address wall leakage. Pleaase see the attached article that addresses creating water tight masonry walls.
Keeping your Single Wythe Masonry Building Dry
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Jerry Painter, FASTM
Don Beers, PE, GC
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