Contemporary masonry veneer construction consists of a single wythe of masonry such as brick or stone mechanically anchored to a backup structure, typically either wood or steel framing or concrete masonry units (CMUs).
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In early iterations of exterior insulation and finish systems (EIFS), issues occurred when board stock rigid insulation was layered against other rigid insulation or exterior sheathing, or when decking traps moisture between the layers of material.
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Among its many functions, the exterior envelope typically must control the movement of heat, air, bulk water, and water vapor both in and out of a building. Over time, various systems and components have been developed to control this movement.
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Fluid-applied air and water barrier products have rapidly gained market share in many areas of the country, but they are still relatively new to the industry. It is perhaps unsurprising then that various failures of these products have been seen during their installation.
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Providing adequate rainwater management and control for air, vapor, and heat flow through the building enclosure is critical to long-term performance and durability. In contemporary wall assemblies with layered materials, the complexity of coordinating these various demands can be overwhelming.
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