CHI Insulation & Ventilation Inspection 3

Question 1

In building science and ventilation assessment, what does the abbreviation 'ACH' stand for?

Accepted Answer

Air Changes per Hour

Answer

ACH (Air Changes per Hour) measures how many times the total volume of air within a space is replaced in one hour; it is used to evaluate ventilation effectiveness and building airtightness.

Question 2

In which building areas should a home inspector pay the closest attention to proper vapor barrier installation to prevent insulation moisture damage?

Accepted Answer

Crawl spaces, basements, and unvented cathedral ceilings

Answer

Crawl spaces, basements, and unvented cathedral ceilings are high-moisture-risk areas where improper or missing vapor control leads to condensation, mold growth, and insulation failure.

Question 3

Which mechanical ventilation device is most commonly installed in bathrooms to remove excess humidity and odors during and after bathing?

Accepted Answer

Exhaust fan

Answer

Bathroom exhaust fans are spot ventilation devices that directly exhaust humid air to the building exterior, preventing moisture buildup that can lead to mold, mildew, and paint failure.

Question 4

What is the most common visual indicator of chronic inadequate attic ventilation that a home inspector is likely to observe during an attic inspection?

Accepted Answer

Dark staining or moisture damage on the underside of the roof sheathing

Answer

Dark staining and moisture damage on the underside of roof sheathing indicates repeated condensation buildup from warm, moist attic air that cannot escape due to insufficient ventilation.

Question 5

What is the primary function of insulation baffles (rafter vents or ventilation chutes) installed in attic rafter bays near the eaves?

Accepted Answer

To maintain a clear airflow channel from soffit vents into the attic, preventing insulation from blocking intake air

Answer

Baffles create a dedicated airway along the rafter bay so that soffit intake air can flow freely into the attic space without being obstructed by insulation pushed toward the eaves.

(CHI) Certified Home Inspector Practice Test

(CHI) Certified Home Inspector Practice Test

CHI Insulation & Ventilation Inspection 3