Moisture will get trapped in the wall between the continuous extruded polystyrene insulation (XPS) foam board (on the exterior) and poly (on the interior), with no ability to dry. This can create a ???moisture sandwich.???

Managing Moisture in Masonry Wall Assemblies

While the quest for increased R-values has led to dramatic reductions in air movement through building assemblies, it has also reduced their ability to dry when they get wet. In-wall systems allow this moisture to dissipate while maintaining the desired degree of airtightness. One way to create moisture escape routes is through construction techniques. Another is through the use of products that employ advanced air/moisture barrier technology.

The secondary benefit of air barriers is actually the primary role of the water-resistive barrier (WRB): keeping wall assemblies dry.

Air, Vapor, and Water-Resistive Barriers

Masonry-clad buildings leak. They leak air, vapor, and water. These leaks place an environmental load on the building envelope, structural components, mechanical systems, and even building occupants. If left unchecked, these loads can result in building component and system failures.

Protecting buildings from unwanted air and moisture infiltration is an essential component of a proper building enclosure. The AIR-SHIELD??line from W. R. MEADOWS??meets all current code requirements for air barriers.

Detailing Air Barriers

High-performance buildings are constructed to maximize energy efficiency, durability and overall occupant comfort. As the demand for these buildings continues to increase, it is important to understand that one of the key aspects of achieving this is proper building enclosure design and overall wall system performance.

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