ASHI Interiors, Insulation & Ventilation 4 — Questions and Answers
Question 1: An inspector observes white crystalline deposits (efflorescence) on interior basement masonry walls. What does this PRIMARILY indicate?
- The concrete was improperly mixed during construction
- Water is moving through the masonry wall and depositing dissolved salts (Correct answer)
- The wall paint is reacting with the concrete surface
- High radon levels are causing mineral breakdown
Correct answer: Water is moving through the masonry wall and depositing dissolved salts
Efflorescence is caused by water migrating through masonry, dissolving soluble salts, and depositing them on the surface as the water evaporates, indicating active or past moisture intrusion.
Question 2: Which type of insulation poses the GREATEST health risk during installation if not properly contained, and requires special handling precautions?
- Closed-cell spray polyurethane foam
- Loose-fill cellulose insulation
- Vermiculite insulation (pre-1990 Zonolite brand) (Correct answer)
- Rigid foam board insulation
Correct answer: Vermiculite insulation (pre-1990 Zonolite brand)
Vermiculite insulation, particularly Zonolite brand mined before 1990, is often contaminated with asbestos and should be left undisturbed; any disturbance requires professional asbestos abatement.
Question 3: A home inspector finds interior window sills with peeling paint and soft, decayed wood. What is the MOST likely cause?
- UV degradation of the paint over many years
- Condensation from interior humidity collecting on the cold sill surface (Correct answer)
- Improper primer application during the original painting
- Insect activity beneath the paint film
Correct answer: Condensation from interior humidity collecting on the cold sill surface
Window sills frequently experience condensation when warm interior air contacts the cold glass and sill surface; persistent moisture causes paint failure and eventually wood decay.
Question 4: What is the ASHI Standards of Practice requirement regarding inspection of insulation in finished walls?
- Inspectors must use thermal imaging cameras to detect missing insulation
- Inspectors are not required to inspect insulation in finished walls (Correct answer)
- Inspectors must remove at least one outlet cover to check each exterior wall
- Inspectors must report estimated R-values for all finished walls
Correct answer: Inspectors are not required to inspect insulation in finished walls
ASHI Standards of Practice do not require inspectors to inspect insulation in finished walls since it is concealed; inspectors are only required to report on readily accessible insulation.
Question 5: An inspector finds stair risers that are inconsistent in height, with some varying by more than 3/8 inch from others. What is the PRIMARY safety concern?
- Structural weakness in the stair stringer
- Trip hazard due to inconsistent step heights disrupting a person's gait (Correct answer)
- Non-compliance with fire egress width requirements
- Aesthetic defect reducing the home's market value
Correct answer: Trip hazard due to inconsistent step heights disrupting a person's gait
Inconsistent riser heights are a significant trip hazard because people develop a walking rhythm on stairs; unexpected height changes cause stumbling and falls.
Question 6: During an attic inspection, an inspector finds multiple bathroom and kitchen exhaust fan ducts that are flexible and kinked at sharp angles. What should be reported?
- Kinks reduce airflow efficiency and may cause moisture to collect in the duct, promoting mold (Correct answer)
- Flexible ducts are prohibited in attics regardless of condition
- Sharp bends increase fan motor noise but do not affect performance
- The duct material is acceptable only if it is insulated flex duct
Correct answer: Kinks reduce airflow efficiency and may cause moisture to collect in the duct, promoting mold
Kinked or sharply bent flexible exhaust ducts restrict airflow, reduce ventilation effectiveness, and can trap condensed moisture that leads to mold growth inside the duct.
Question 7: What does an inspector look for when evaluating the adequacy of whole-house ventilation in a home without mechanical ventilation?
- Verify the HVAC filter is replaced monthly
- Check that operable windows are present in each room and that the home has sufficient air leakage paths (Correct answer)
- Confirm a dehumidifier is installed in the basement
- Measure CO2 levels in each room with a gas detector
Correct answer: Check that operable windows are present in each room and that the home has sufficient air leakage paths
In homes without mechanical ventilation, operable windows are the primary means of occupant-controlled ventilation, and natural infiltration through the building envelope provides background air exchange.
ASHI Interiors, Insulation & Ventilation 4
An inspector observes white crystalline deposits (efflorescence) on interior basement masonry walls.
What does this PRIMARILY indicate?