Tag Archives: Concrete masonry unit

Retrofitting multi-wythe masonry as a veneer assembly

The exterior walls of ‘historic’ buildings are typically constructed of multi-wythe masonry, which controls rainwater by absorption and evaporation. This type of assembly does not have internal drainage and often lacks flashings at critical locations (e.g. window heads), making them susceptible to leakage as the mortar joints deteriorate over time or during heavy, prolonged storm events. Embedded steel in the masonry walls can rust and ‘exfoliate,’ resulting in masonry cracking and bulging, along with increased water entry into the wall system.

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