What is the thermal boundary of a building?
Building Envelope
Question · Easy
What does R-value measure in building insulation?
How is U-factor related to R-value for a building assembly?
Question · Medium
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Which of the following is an example of heat transfer by conduction?
Which heat transfer mechanism is responsible for heat loss through air leaks in the envelope?
A wood-framed 2x6 wall cavity is filled with R-21 fiberglass batt insulation. The whole-wall R-value will be:
Why is continuous exterior insulation (rigid foam over the sheathing) increasingly common in code-built walls?
Which envelope component typically has the lowest R-value in a code-built home?
What does SHGC stand for in window performance ratings?
An auditor measures temperature differences with an infrared camera. A cold streak running vertically up a wall on a winter day is most likely:
Which statement BEST describes the relationship between the thermal boundary and the air (pressure) boundary?
The 2021 IECC prescriptive path requires what minimum attic insulation R-value for most of the United States (climate zones 4 through 8)?
Question · Hard
Why is air film resistance included when calculating window U-factor in NFRC ratings?
A homeowner installs additional attic insulation on top of an existing batt without addressing recessed lights or attic access. The likely outcome is:
Which of these is NOT typically considered part of the building envelope?
An auditor evaluates a knee-wall attic and finds insulation on the back of the knee wall but no insulation in the sloped roof rafters above the conditioned bonus room. The defect is:
Approximately what R-value per inch does standard fiberglass batt insulation provide?
Insulation Types
What is the approximate R-value per inch of dense-packed blown cellulose insulation?
Closed-cell spray polyurethane foam has an approximate R-value per inch of:
Open-cell spray polyurethane foam has an approximate R-value per inch of:
Which of these rigid foam boards typically provides the HIGHEST R-value per inch at room temperature?
Polyiso rigid foam exhibits which behavior in cold climates that should affect specification decisions?
An auditor finds 12 inches of blown cellulose in an attic. The estimated R-value is approximately:
Why is open-cell spray foam typically NOT used on the underside of an unvented roof deck in cold climates without additional measures?
A 2x4 (3.5-inch nominal cavity) wall cavity filled with standard fiberglass batt would typically be labeled:
An auditor inspects an attic and finds fiberglass batts installed with the kraft-paper vapor retarder facing UP toward the cold attic. This is:
Compressed or wadded fiberglass batts in a wall cavity result in:
When dense-packing existing wall cavities with cellulose, the typical target density is approximately:
Closed-cell spray polyurethane foam is most often selected over open-cell for which application?
Which rigid foam is most commonly specified for below-grade (foundation) exterior insulation due to moisture resistance?
Mineral wool insulation (also called rock wool or stone wool) differs from fiberglass batts in which important way?
Radiant barriers installed in attics work by:
What does CFM50 measure in a blower door test?
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What does ACH50 represent?
A home has a measured CFM50 of 1,500 and a conditioned volume of 15,000 cubic feet. What is the ACH50?
ANSI/RESNET/ICC 380 is the recognized standard for what type of testing?
The 2021 IECC requires what maximum envelope air leakage rate in climate zones 3 through 8?
During a blower door test, the house is depressurized (rather than pressurized). What is the practical reason for depressurization in most testing?
Which of the following is the LARGEST single source of air leakage in many existing single-family homes?
What is the typical relationship between ACH50 and ACHnat (natural air change rate)?
Before performing a blower-door test, the auditor should:
An auditor finds severe leakage at a rim joist. The recommended air-sealing approach in a basement is typically:
While performing a blower-door test, an auditor notices that the front door begins to slam from significant pressure across it. The likely cause is:
Which is NOT a typical air-leakage location identified during a blower-door diagnostic?
What is the recommended action when a baseline blower-door test reveals an attached garage is communicating with the conditioned house via a shared attic?
Building tightness too aggressive without mechanical ventilation can result in:
An auditor measures CFM50 of 2,400 in a 2,000 square foot single-story home with 8-foot ceilings (volume 16,000 cubic feet). What is the approximate ACH50?
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