What is the single most important criterion for an effective air barrier system?

Prepare for the ABAA Whole-Building Airtightness Testing Level 1. Master the concepts with various study materials including flashcards and practice questions. Get ready to ace your exam effortlessly!

Continuity is the single most important criterion for an effective air barrier system because it ensures that the barrier is unbroken and fully sealed throughout the building envelope. An effective air barrier must be continuous from the foundation to the roof and around all penetrations, transitions, and junctions to be effective in preventing unwanted air leakage. Even small gaps or discontinuities can significantly compromise the performance of the air barrier, leading to increased energy costs, moisture issues, and indoor air quality concerns.

While affordability, type of material used, and visual appeal are relevant factors in selecting an air barrier system, they do not directly impact its ability to perform its primary function of controlling air flow. Continuity is paramount because it directly relates to the system's effectiveness in minimizing air leakage, making it crucial for achieving energy efficiency and comfort in a building.

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