Home Inspector Test Home Inspector Insulation and Ventilation 2 — Questions and Answers
Question 1: A home inspector observes dark staining on attic rafters and sheathing with no visible roof leaks. What is the most likely cause?
- Roof sheathing aging
- Inadequate attic ventilation causing condensation (Correct answer)
- Insect activity
- UV degradation
Correct answer: Inadequate attic ventilation causing condensation
Dark staining on attic wood surfaces without active roof leaks typically indicates condensation from poor ventilation, which promotes mold and mildew growth.
Question 2: What does 'thermal bridging' refer to in the context of building insulation?
- Heat transfer through a conductive structural element bypassing insulation (Correct answer)
- A bridge connecting two insulated walls
- The transfer of heat via radiant energy
- Air movement between insulated cavities
Correct answer: Heat transfer through a conductive structural element bypassing insulation
Thermal bridging occurs when a conductive material like a stud or metal connector creates a path for heat to bypass the insulation layer, reducing overall assembly R-value.
Question 3: What is the correct installation orientation for kraft-faced fiberglass batt insulation in an exterior wall?
- Kraft facing toward the exterior
- Kraft facing toward the interior (warm-in-winter side) (Correct answer)
- Kraft facing can face either direction
- Kraft facing should be removed before installation
Correct answer: Kraft facing toward the interior (warm-in-winter side)
Kraft facing acts as a vapor retarder and must face the warm-in-winter side (interior) to prevent moisture from migrating into the wall cavity.
Question 4: Which of the following is a sign that bathroom exhaust fans are NOT properly vented?
- Fan runs loudly
- Moisture staining or mold near the fan or in the attic above (Correct answer)
- Fan has a backdraft damper
- Fan is ENERGY STAR rated
Correct answer: Moisture staining or mold near the fan or in the attic above
Moisture staining or mold near the exhaust fan or in the attic directly above indicates the fan is terminating in the attic rather than venting to the exterior.
Question 5: A home inspector notes missing insulation baffles at the eaves. Why is this a deficiency?
- Baffles are cosmetic only and not required
- Without baffles, insulation can block soffit vents and restrict ventilation (Correct answer)
- Baffles improve R-value directly
- Baffles are only required in new construction
Correct answer: Without baffles, insulation can block soffit vents and restrict ventilation
Insulation baffles (rafter vents) maintain a clear airflow channel from soffit vents to the attic; without them, blown-in or batt insulation can block the intake vents.
Question 6: What type of insulation is typically required to be covered with a thermal barrier (such as drywall) when installed in living spaces?
- Fiberglass batt
- Mineral wool batt
- Spray polyurethane foam (SPF) (Correct answer)
- Rigid mineral wool board
Correct answer: Spray polyurethane foam (SPF)
Spray polyurethane foam is combustible and must be covered with an approved thermal barrier like ½-inch drywall to limit fire spread in occupied spaces.
Home Inspector Test Home Inspector Insulation and Ventilation 2
A home inspector observes dark staining on attic rafters and sheathing with no visible roof leaks.
What is the most likely cause?