NHIE Insulation and Ventilation

Question 1

What does R-value measure in building insulation?

Accepted Answer

The thermal resistance of insulation to heat flow

Answer

R-value measures thermal resistance — the higher the R-value, the greater the insulation's resistance to heat flow through it.

Question 2

Which older insulation material may contain asbestos and should be flagged as a potential health hazard during inspection?

Accepted Answer

Vermiculite insulation

Answer

Vermiculite from Libby, Montana was contaminated with asbestos and poses a health risk if disturbed; inspectors should recommend professional testing.

Question 3

What is the primary purpose of a vapor barrier installed on a crawl space floor?

Accepted Answer

To reduce soil moisture from migrating into the crawl space

Answer

A ground cover vapor barrier reduces moisture evaporation from soil into the crawl space, preventing condensation and wood damage.

Question 4

What is the minimum recommended attic ventilation ratio when a vapor retarder is present?

Accepted Answer

1:300

Answer

Building codes typically require 1 square foot of net free ventilation area per 300 square feet of attic floor when a vapor retarder is used.

Question 5

Which type of insulation expands upon application to fill gaps and create an effective air seal?

Accepted Answer

Spray polyurethane foam (SPF)

Answer

Spray polyurethane foam expands after application to seal gaps, cracks, and voids, providing both thermal insulation and air sealing.

(NHIE) National Home Inspector Examination Practice Test

(NHIE) National Home Inspector Examination Practice Test

NHIE Insulation and Ventilation