ABAA Whole-Building Airtightness Level 1 Practice Exam 2025 – Complete Exam Prep

The choice of clamping all joints in polyethylene sheets represents an effective method for air sealing in an interior air barrier because it creates a continuous and reliable barrier against air leakage. Polyethylene sheets, often used as air barriers, are designed to minimize the flow of air between conditioned and unconditioned spaces. Clamping the joints ensures that there is a tight seal between the sheets, reducing the potential for gaps or openings where air could escape or enter, which is essential for maintaining energy efficiency and indoor air quality. This method directly addresses the need for comprehensive sealing in interior applications, thereby enhancing the overall effectiveness of the air barrier system.

Other options may be less effective; for instance, using external insulation does not directly contribute to sealing the interior air barrier, leaving joints unsealed for expansion can lead to significant air leaks, and installing windows without sealing is contrary to best practices for ensuring airtightness.