Which action is included as part of controlling air leakage through construction and renovation?

• A. Detect air leakage locations
• B. Seal joints
• C. Seal penetrations with caulking
• D. Install a new thermostat

Answer: (D)

Controlling air leakage means reducing unintended air flow through the building envelope during construction or renovation. The practical way to do this is by addressing where leaks occur and blocking them. Sealing joints and sealing penetrations with caulking are direct actions that reduce air leakage by closing gaps and seams through which air can pass. Detecting air leakage locations helps identify where to act, but it doesn’t by itself reduce leakage. Installing a new thermostat, while useful for temperature control, does not stop air from moving through cracks or gaps in the building envelope.