Applying Lessons from Clay-Brick Veneer to Design a Stucco Mix

A number of reported moisture-originated failures in stucco-clad walls, attributed in most cases to poor detail design, highlight some misconceptions about moisture control of exterior stucco (other names are plaster or rendering) systems. The authors believe that different type of stucco, installed on an adequate substrate layer, and integrated with proven architectural details can be one of the most economical and ecologically-justified cladding systems that will perform well in most climates. However, the approach to moisture management of this system and to building enclosures in general, must be changed. The new paradigm should be based on moisture balance of the cladding system in combination with moisture management that relates to climatic and service conditions.