Home Inspector Test Home Inspector Insulation and Ventilation

Question 1

What is the minimum recommended R-value for attic insulation in a cold US climate zone (Zone 5–8)?

Accepted Answer

R-49

Answer

The US Department of Energy recommends R-49 to R-60 for attic insulation in cold climate zones 5–8.

Question 2

Which type of insulation is most commonly found loose-filled in older attics and may contain asbestos?

Accepted Answer

Vermiculite

Answer

Vermiculite insulation, often mined from Libby, Montana, is commonly contaminated with asbestos and was widely used as loose-fill attic insulation.

Question 3

What is the purpose of a vapor retarder installed on the warm side of insulation?

Accepted Answer

Prevent moisture migration into wall or ceiling cavities

Answer

A vapor retarder limits the movement of moisture-laden air from the conditioned space into insulated cavities where it could condense and cause damage.

Question 4

A home inspector finds that attic insulation is blocking soffit vents. What is the primary concern?

Accepted Answer

Restricted attic ventilation leading to moisture and heat buildup

Answer

Blocked soffit vents prevent proper intake airflow, causing heat and moisture to accumulate in the attic, which can damage sheathing and shorten shingle life.

Question 5

What is the standard net free area ventilation ratio required by most US building codes for attic ventilation?

Accepted Answer

1:150

Answer

Building codes generally require a minimum of 1 square foot of net free ventilation area for every 150 square feet of attic floor space.

Home Inspector Test Practice Test

Home Inspector Test Practice Test

Home Inspector Test Home Inspector Insulation and Ventilation