These terms are often described as simple—so why is there so much confusion? This presentation explains what air barriers, vapor barriers, and water-resistive barriers are, and when a single material may serve more than one function. That overlap is often where misunderstandings arise. The session explores which barriers are critical, which may be less so, and how their role can change depending on where they are installed within the building envelope. The impact of thermal bridging on barrier performance is also examined.

Learning Objectives:

1.  Define air, vapor, and water-resistive barriers
2. Identify the various ways water can enter a building
3.  Explain why hidden conditions often present the greatest risk
4.  Recognize which barriers are critical to building performance

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Laverne Dalgleish, Executive Director, Air Barrier Association of America

Laverne Dalgleish is the Executive Director of the Air Barrier Association of America (ABAA). As such, he works to champion energy conservation in buildings while educating the building owners and designers about the benefits of energy conservation such as durability, comfort, reduced maintenance, reduced HVAC equipment costs and the positive impact on the environment.

Mr. Dalgleish travels North America on a weekly basis to educate building owners and designers on the benefits of effective and working air barrier systems in buildings. This education mission includes working with standards development organizations, training and education groups, government policy departments, and quality assurance program developers for the construction industry. Mr. Dalgleish is the Secretariat of two ISO Committees, ISO TC61 SC10 Cellular Plastics and ISO TC163 SC3 Thermal Insulation Products. He is also Chair of the ULC Thermal Performance in the Building Environment Standards Committee.

Mr. Dalgleish was the key developer of the ABAA Quality Assurance Program for the installation of air barrier systems in buildings. This program is based on ISO9000 and ISO 12576-2 but brings the ISO requirements together with practical applications for the air barrier industry.