A building inspector is reviewing the energy efficiency compliance of a newly constructed 12-story high-rise office building (Group B). The building uses a continuous air barrier system. According to the International Energy Conservation Code (IECC) referenced by IBC, which of the following is a required test to verify the performance of the continuous air barrier?
- AInfrared thermography scan
- BWindow U-factor verification
- CBlower door test (building pressurization test)
- DDuct leakage test
Show answer & explanationAnswer & explanation
Correct answer: C. Blower door test (building pressurization test)
According to IECC Section C402.5.1.2 (and referenced by IBC), a continuous air barrier is required, and its installation must be verified. For whole buildings, the IECC mandates either a visual inspection or a whole-building pressurization test (blower door test) as per ASTM E779 or an equivalent standard. The pressurization test directly measures the air leakage of the entire building envelope, verifying the performance of the continuous air barrier.
Why the other options are wrong
- A. Infrared thermography scans can help identify air leakage paths but are typically a diagnostic tool, not a mandated performance verification test for the entire air barrier system in the IECC.
- B. Window U-factor verification ensures thermal performance of windows but does not directly measure the air leakage of the overall air barrier system.
- D. Duct leakage tests verify the integrity of the HVAC ductwork, not the overall building envelope's air barrier.
Air Barrier Verification (IECC)
The International Energy Conservation Code (IECC) requires verification of continuous air barrier performance in commercial buildings to minimize uncontrolled air leakage.
- Essential for energy efficiency.
- Can be verified by visual inspection or whole-building pressurization test.
- Tests overall envelope leakage.
Memory trick: Air barrier: Seal it tight, then blow it to check it's right.