Exam Questions And Correct Answers

CA D65 Weatherization Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• Which of the following is the primary purpose of weatherization?
• Increase property value
• Reduce energy consumption and improve comfort
• Change the building structure
• Comply with zoning laws
• Reduce energy consumption and improve comfort

Rationale: Weatherization focuses on improving energy efficiency,

reducing utility bills, and enhancing comfort.

• What is the first step in conducting a home energy audit?
• Installing insulation
• Measuring indoor temperature
• Evaluating the building envelope for leaks
• Replacing windows
• Evaluating the building envelope for leaks

Rationale: Identifying air leaks in the building envelope is critical to

plan effective weatherization measures.

• Which of the following materials is commonly used for attic

insulation?

• Fiberglass batts
• Concrete blocks
• Plywood sheets
• Vinyl siding
• Fiberglass batts 1 / 3

Rationale: Fiberglass batts are widely used due to their cost-

effectiveness and insulating properties.

• How does caulking improve energy efficiency in a home?
• Increases airflow
• Seals gaps to prevent air leakage
• Adds structural support
• Enhances paint adhesion
• Seals gaps to prevent air leakage

Rationale: Caulking reduces drafts and heat loss by sealing cracks

and gaps around doors, windows, and other openings.

• What is the main risk of improperly installed weatherization materials?
• Reduced aesthetic appeal
• Structural failure
• Moisture accumulation and mold growth
• Increased property taxes
• Moisture accumulation and mold growth

Rationale: Improper installation can trap moisture, leading to mold,

rot, and indoor air quality issues.

• Which of the following is a benefit of installing storm windows?
• Reduces energy loss through windows
• Eliminates the need for HVAC systems
• Increases indoor humidity
• Prevents window breakage during earthquakes
• Reduces energy loss through windows

Rationale: Storm windows provide an extra layer of insulation,

reducing heat transfer.

• What is the recommended R-value for attic insulation in most

California homes?

A) R-11

• R-30 to R-38

C) R-50

D) R-5

• R-30 to R-38

Rationale: The California Energy Commission recommends this R-

value range for adequate attic insulation.

• Which of the following is an energy-efficient lighting option for

residential weatherization projects? 2 / 3

• Incandescent bulbs
• LED bulbs
• Halogen lamps
• Gas lamps
• LED bulbs

Rationale: LEDs consume less energy and have a longer lifespan

compared to traditional lighting.

9. Air sealing is important because it:

• Improves structural integrity
• Reduces energy loss and drafts
• Increases natural ventilation
• Prevents insect infestation
• Reduces energy loss and drafts

Rationale: Proper air sealing minimizes heat loss, improving comfort

and lowering energy bills.

• What is the purpose of a blower door test?
• Measure HVAC efficiency
• Detect air leaks in a building
• Test insulation R-value
• Measure indoor air quality
• Detect air leaks in a building

Rationale: A blower door test depressurizes the home to identify leaks

in the building envelope.

• When insulating walls, why is it important to avoid compressing

insulation?

• It may cause odors
• Compression reduces its effectiveness
• It will damage the wall studs
• It prevents paint adhesion
• Compression reduces its effectiveness

Rationale: Insulation works by trapping air; compressing it reduces

its R-value.

• Which of the following ventilation improvements is

recommended in a tightly sealed home?

• Reduce all airflow
• Install a heat recovery ventilator (HRV)
• Remove windows permanently
• / 3