CEM Building Envelope and Insulation 2

Question 1

Degree days are used in building energy analysis to:

Accepted Answer

Quantify heating or cooling demand based on outdoor temperature deviation from a base

Answer

Heating degree days (HDD) and cooling degree days (CDD) accumulate daily temperature differences from a base (usually 65°F) to estimate seasonal heating and cooling energy needs.

Question 2

Which roof assembly strategy best reduces cooling loads in a hot climate?

Accepted Answer

Cool (high-reflectance, high-emittance) roof surface

Answer

Cool roofs with high solar reflectance and thermal emittance reduce roof surface temperatures, lowering heat conduction into the building and reducing cooling energy use.

Question 3

Adding continuous exterior insulation to a wall assembly primarily helps by:

Accepted Answer

Eliminating thermal bridging through framing members

Answer

Continuous exterior insulation wraps the entire wall face including studs, eliminating thermal bridges at framing and significantly improving whole-wall R-value.

Question 4

Fenestration area strongly affects building energy use because windows typically have:

Accepted Answer

Much lower R-values than insulated walls, increasing heat transfer significantly

Answer

Even high-performance triple-pane windows have U-factors around 0.15-0.20 (R-5 to R-7), far lower than typical insulated walls at R-20 or higher, making windows a major heat loss/gain pathway.

Question 5

Vapor retarders in wall assemblies are installed to:

Accepted Answer

Control moisture diffusion and prevent condensation within the wall cavity

Answer

Vapor retarders slow water vapor diffusion through walls, preventing moisture from condensing within the assembly and causing mold, rot, or insulation degradation.

CEM - Certified Energy Manager Practice Test

CEM - Certified Energy Manager Practice Test

CEM Building Envelope and Insulation 2