Certified Energy Auditor Certification Building Envelope Assessment 3

Question 1

Which ASTM standard governs the test method for air leakage of building envelopes using a blower door?

Accepted Answer

ASTM E779

Answer

ASTM E779 is the standard test method for determining air leakage rate by fan pressurization, which is the basis of blower door testing.

Question 2

What is the recommended pressure differential used during a standard blower door test?

Accepted Answer

50 Pa

Answer

The standard test pressure is 50 Pascals, and the resulting airflow (CFM50) is used to calculate ACH50 and ELA.

Question 3

Continuous insulation (ci) on the exterior of a wall primarily addresses which building science problem?

Accepted Answer

Thermal bridging through studs

Answer

Exterior continuous insulation wraps over studs and other framing members, eliminating the thermal bridging pathway that degrades whole-wall R-value.

Question 4

Which building envelope component is typically responsible for the greatest share of infiltration in existing residential construction?

Accepted Answer

Exterior wall penetrations and bypasses

Answer

Research consistently shows that penetrations, bypasses, and connections between assemblies (e.g., wall-to-ceiling, plumbing chases) account for the majority of unintended air leakage.

Question 5

When using infrared thermography to locate air leakage, what is the recommended minimum indoor-outdoor temperature difference?

Accepted Answer

15°F (8°C)

Answer

A minimum delta-T of approximately 15°F (8°C) is generally recommended to produce sufficient thermal contrast for reliable IRT results.

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Building Envelope Assessment 3