Which step is performed first in the sequence?

• A. Identify and seal air leaks
• B. Install interior finish
• C. Install insulation
• D. Inspect for gaps and seal

Answer: (A)

Identifying and sealing air leaks comes first because stopping air movement is the foundation for an energy-efficient envelope. Air leaks let warm or cool air bypass insulation, so sealing cracks, gaps, and penetrations around doors, windows, vents, electrical outlets, and where pipes or wires pass through helps to prevent drafts and moisture migration. Once those leaks are addressed, insulation can do its job more effectively, since conditioned air isn’t constantly escaping or infiltrating through openings.

Installing interior finish or insulation after sealing is the logical next steps, as they depend on a tight shell to maximize performance. While inspecting for gaps and sealing is important, the immediate initial action is to identify and seal air leaks to establish a solid, energy-efficient starting point.