InterNACHI - International Association of Certified Home Inspectors Insulation and Ventilation Questions and Answers

Question 1

An inspector in an attic observes that the soffit vents are completely blocked by blown-in insulation, but a ridge vent is present.
What is the most likely consequence of this condition during cold winter months?

Accepted Answer

The formation of ice dams at the eaves.

Answer

Reduced heating costs due to less cold air infiltration.

Answer

Over-drying of the roof sheathing from excessive airflow.

Answer

Increased overall effectiveness of the ridge vent.

Question 2

While inspecting an attic, you observe a non-IC-rated recessed light fixture with blown-in insulation packed tightly against its housing. What is the PRIMARY safety hazard this condition presents?

Accepted Answer

A significant fire hazard due to overheating.

Answer

Degradation of the insulation's R-value.

Answer

Reduced light output from the bulb.

Answer

A drafty condition causing energy loss.

Question 3

In a cold climate like North Dakota, where should the vapor retarder (e.g., kraft paper facing on insulation) be placed in an exterior wall assembly?

Accepted Answer

On the interior side of the insulation, directly behind the drywall.

Answer

On the exterior side of the insulation, directly behind the sheathing.

Answer

It is not required in very cold climates.

Answer

In the middle of the wall cavity, between two layers of insulation.

Question 4

During an inspection, a bathroom exhaust fan duct is found to terminate inside the attic space, discharging moist air near a gable vent. According to modern building standards, what should the inspector report?

Accepted Answer

The duct is improperly terminated and must be extended to discharge directly to the building's exterior.

Answer

This is an acceptable installation as long as it is within 5 feet of a vent.

Answer

The gable vent provides sufficient ventilation for this type of discharge.

Answer

The duct material should be changed from flexible to rigid metal.

Question 5

Which of the following is a primary purpose of ventilating a traditional, unconditioned crawlspace?

Accepted Answer

To help remove moisture from the ground and prevent fungal growth.

Answer

To warm the floors of the living space above during winter.

Answer

To provide a suitable area for conditioned storage.

Answer

To allow radon gas to enter the home more easily.

Question 6

An inspector observes loose-fill insulation in an attic that is gray, has a fibrous texture, and appears to be made from recycled paper. This material is most likely:

Accepted Answer

Cellulose.

Answer

Blown-in fiberglass.

Answer

Vermiculite.

Answer

Rock wool.

An inspector in an attic observes that the soffit vents are completely blocked by blown-in insulation, but a ridge vent is present.What is the most likely consequence of this condition during cold winter months?

An inspector in an attic observes that the soffit vents are completely blocked by blown-in insulation, but a ridge vent is present.
What is the most likely consequence of this condition during cold winter months?