InterNACHI Insulation and Ventilation 4

Question 1

What is the minimum recommended R-value for attic insulation in a Climate Zone 5 home, per DOE guidelines commonly referenced by InterNACHI?

Accepted Answer

R-49

Answer

The DOE recommends R-49 to R-60 for attics in Climate Zone 5, reflecting the need for high thermal resistance in colder northern climates.

Question 2

An inspector finds that recessed light fixtures in the ceiling below an attic are not IC-rated but are in direct contact with insulation. What is the hazard?

Accepted Answer

Heat buildup from non-IC fixtures in contact with insulation can cause a fire

Answer

Non-IC-rated (Insulation Contact) fixtures are not designed to handle heat buildup when surrounded by insulation, creating a potential fire hazard.

Question 3

Which type of ventilation system uses negative pressure created by exhaust fans to draw fresh air through intentional or unintentional openings in the building envelope?

Accepted Answer

Exhaust-only ventilation

Answer

Exhaust-only systems depressurize the building, drawing outdoor air in through leaks and intentional inlets to replace the exhausted air.

Question 4

What does a home inspector look for when evaluating whether blown-in cellulose insulation in an attic has settled significantly?

Accepted Answer

Depth ruler markings on attic trusses or joists indicating original fill depth

Answer

Depth rulers or markers installed at the time of insulation installation allow inspectors and homeowners to verify whether cellulose has settled below its original depth.

Question 5

A home inspector observes that a whole-house fan is installed in the ceiling but has no insulated cover in place during winter. What is the primary concern?

Accepted Answer

The large uninsulated opening allows significant heat loss and cold air infiltration

Answer

Whole-house fan openings represent a significant thermal and air-sealing weakness in winter; without an insulated cover, they allow substantial heat loss and cold infiltration.

(InterNACHI) International Association of Certified Home Inspectors Practice Test

(InterNACHI) International Association of Certified Home Inspectors Practice Test

InterNACHI Insulation and Ventilation 4