Sealed and Delivered: The Role of Water-Resistive Barriers  

This course explores the essential code mandates, types, and configurations of water-resistive barriers (WRBs) in exterior wall assemblies. Originally developed to protect moisture-sensitive components in framed wall construction, WRBs have since become a mandated safeguard, ensuring the longevity and performance of structural assemblies. Positioned between the framed wall and exterior cladding, these invisible yet vital layers shield buildings from water intrusion and deterioration.

From traditional asphalt-impregnated felts to cutting-edge liquid-applied films and advanced engineered sheathing panels, WRBs have continuously evolved. In this course, you'll explore the various WRB types, their optimal applications, and the science behind their effectiveness. We will examine empirical data that underscores the decades-long reliability of asphalt-impregnated paper, highlighting why it remains relevant today. Additionally, we'll analyze how WRB placement plays a critical role, particularly in exterior insulated assemblies, shaping their overall performance and durability.

Photo courtesy of WWCCA/Technical Services Information Bureau

Albert Carrillo began his construction career in Arizona as an applicator for stucco, EIFS, fireproofing and interior plaster. After moving to New Mexico to work as a plasterer he formed his own stucco company. After closing the business, he spent over ten years as regional manager for Dryvit Systems Inc.—a major EIFS manufacturer. In 2008 he was hired as the Arizona Manager for the Western Wall & Ceiling Contractor Association covering administrative and technical duties. In 2015 he was promoted to CEO of the WWCCA covering the Southwest Region.