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November 10 - November 14, 2014

Can lightweight block (CMU) be successfully coated to prevent water intrusion, or is it best to build with standard weight?


Selected Answers

From Harry Gendel of Harry Gendel Architects on November 17, 2014:
Both types of block have the same problem.

From john bares of its really concrete, inc. on November 14, 2014:
Of course it can be successfully coated. I'm not aware of any waterproofing material that cares about the substrate to which it's applied as long as there is sufficient adhesion for the material to achieve its intended purpose. (previous comments acknowledged).

From Michael Quaranta of OPERATIONS 40 on November 11, 2014:
I, too, am puzzled by the question. Is it a wall or a flat surface or a roof. Is it interior or exterior? Where is the supposed intrusion coming from, rain? Several manufacturers of lightweight block allow larger voids to achieve the lightweight look. Yes, there is a coating, but filling the voids may require several coats.

From john schultz of o-gee paint co on November 10, 2014:
I don't understand this question. I believe it is too open-ended to provide an answer. Coated? With what - bituminous? Can it be membrane-reinforced? Coated with masonry material, then with another coating? Within a particular budget?

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Tagged categories: Asia Pacific; Concrete coatings and treatments; Concrete masonry units (CMU); EMEA (Europe, Middle East and Africa); Good Technical Practice; Latin America; North America


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