NHIE Environmental Concerns and Safety Issues 2 — Questions and Answers
Question 1: What is the primary health concern associated with exposure to vermiculite insulation in homes built before 1990?
- Fiberglass irritation
- Asbestos contamination from Libby, Montana mines (Correct answer)
- Formaldehyde off-gassing
- Radon emission
Correct answer: Asbestos contamination from Libby, Montana mines
Much of the vermiculite sold before 1990 came from Libby, Montana mines contaminated with asbestos-like tremolite fibers.
Question 2: A home inspector notices white crystalline stains on a basement wall. This efflorescence most directly indicates:
- Sulfur compound deposits from well water
- Water migration through masonry carrying dissolved minerals (Correct answer)
- Asbestos fiber deposits
- Lead paint deterioration
Correct answer: Water migration through masonry carrying dissolved minerals
Efflorescence is caused by water moving through masonry, dissolving salts, and depositing them on the surface as it evaporates.
Question 3: Which condition most significantly increases the risk of carbon monoxide accumulation inside a residence?
- Open windows near combustion appliances
- Negative air pressure caused by exhaust fans drawing combustion air from flues (Correct answer)
- High relative humidity in the basement
- Presence of older galvanized plumbing
Correct answer: Negative air pressure caused by exhaust fans drawing combustion air from flues
Negative pressure (backdrafting) can pull combustion gases including CO back into living spaces from flues and heat exchangers.
Question 4: When inspecting a home with a private well, a home inspector should note that bacterial contamination is most commonly tested for using:
- pH and hardness panels
- Total coliform and E. coli analysis (Correct answer)
- Heavy metals screening
- Volatile organic compound analysis
Correct answer: Total coliform and E. coli analysis
Total coliform and E. coli tests are the standard indicators used to assess bacterial contamination in drinking water.
Question 5: A home inspector observes a floor tile that is soft, dimpled, and 9x9 inches in a home built in 1958. The appropriate action is to:
- Remove a sample for lab testing immediately
- Note the tile as presumed asbestos-containing material and recommend testing before disturbance (Correct answer)
- Advise the client to scrape and replace tiles promptly
- Report that the tile is safe because it is intact
Correct answer: Note the tile as presumed asbestos-containing material and recommend testing before disturbance
9x9 inch resilient floor tiles from that era are presumed ACM; they should be noted and undisturbed until tested or handled by a qualified abatement professional.
Question 6: Which area of a home typically presents the highest radon entry risk?
- Attic vents and ridge caps
- Crawl space floor penetrations and sump pits (Correct answer)
- Upper-floor bathroom drains
- Exterior wall weep holes
Correct answer: Crawl space floor penetrations and sump pits
Radon enters homes primarily through soil contact points such as crawl space floors, foundation cracks, and sump pits due to pressure differentials.
Question 7: Lead paint on exterior trim is considered most hazardous to children when it is:
- Intact and covered by newer paint layers
- Chalking, chipping, or on friction surfaces that create dust (Correct answer)
- Located above the height of 6 feet
- Sealed with oil-based primer
Correct answer: Chalking, chipping, or on friction surfaces that create dust
Deteriorating or friction-surface lead paint generates dust and chips that are the primary pathway for childhood lead ingestion.
NHIE Environmental Concerns and Safety Issues 2
What is the primary health concern associated with exposure to vermiculite insulation in homes built before 1990?