InterNACHI - International Association of Certified Home Inspectors Interior Components and Finishes Questions and Answers — Questions and Answers
Question 1: While inspecting a recently built home, you observe that the solid hardwood flooring on the main level is 'cupping,' with the edges of the boards being slightly higher than their centers. What is the most likely cause of this condition?
- The flooring was installed with an insufficient expansion gap at the perimeter walls.
- The home's interior is excessively dry due to the heating system.
- There is a moisture imbalance, with the bottom of the flooring having a higher moisture content than the top. (Correct answer)
- The subfloor is uneven, causing the boards to deflect under load.
Correct answer: There is a moisture imbalance, with the bottom of the flooring having a higher moisture content than the top.
Hardwood floor cupping occurs when there is a moisture imbalance through the thickness of the wood. The bottom of the board absorbs more moisture than the top surface, causing it to expand and push the edges upward. This is often due to moisture from a subfloor, crawlspace, or basement. Excessive dryness typically causes gapping, not cupping.
Question 2: According to the International Residential Code (IRC), which of the following situations requires the installation of safety glazing?
- A fixed window in a living room where the bottom edge is 24 inches above the floor and the total area is 8 square feet.
- A glass panel in a cabinet door located in a kitchen.
- Glazing in a swinging door that separates a bedroom from a hallway. (Correct answer)
- An upper sash of a double-hung window in a second-floor bedroom.
Correct answer: Glazing in a swinging door that separates a bedroom from a hallway.
The IRC identifies specific hazardous locations where safety glazing is required to prevent injury from broken glass. Glazing in all swinging doors is considered a hazardous location and requires safety glass, such as tempered or laminated glass. The other scenarios do not meet the specific criteria for a hazardous location requiring safety glazing.
Question 3: During an interior inspection, you are evaluating a flight of stairs. You measure the height of each riser and find that the tallest riser is 7 1/2 inches and the shortest is 7 inches. According to modern building standards, what should you report?
- The riser heights are acceptable as they are all under the 7 3/4-inch maximum.
- The 1/2-inch variation between the tallest and shortest riser is a safety hazard. (Correct answer)
- The stairs are non-compliant because the minimum riser height is 7 1/4 inches.
- The variation is only a concern if the tread depth is less than 11 inches.
Correct answer: The 1/2-inch variation between the tallest and shortest riser is a safety hazard.
Building codes, such as the IRC, specify that the greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (0.375 inches). In this case, the variation is 1/2 inch (0.5 inches), which exceeds the allowable tolerance and creates an inconsistent stepping pattern, posing a trip hazard.
Question 4: An inspector is examining the interior of an attached garage and notes that the entry door leading into the house is a standard, hollow-core interior door. Why is this a significant defect?
- The door provides inadequate security against forced entry from the garage.
- Hollow-core doors are not insulated, leading to significant energy loss.
- The door is not properly sealed to prevent vehicle exhaust fumes from entering the home.
- The door lacks the required fire-resistance rating to slow the spread of a fire from the garage to the living space. (Correct answer)
Correct answer: The door lacks the required fire-resistance rating to slow the spread of a fire from the garage to the living space.
The door between an attached garage and the living area is part of the fire separation. Building codes require this door to be a solid wood door at least 1-3/8 inches thick, a solid or honeycomb-core steel door of the same thickness, or a door with a minimum 20-minute fire rating. A hollow-core door offers minimal fire resistance and is a serious safety hazard.
Question 5: Which of the following is the most common cause for 'nail pops' appearing on interior drywall surfaces, especially in newer construction?
- Corrosion of the metal fasteners due to high interior humidity.
- Shrinkage of the wood framing members as they dry out. (Correct answer)
- The use of oversized drywall fasteners for the thickness of the board.
- Vibrations from nearby construction or heavy traffic.
Correct answer: Shrinkage of the wood framing members as they dry out.
The most common cause of nail or screw pops is the natural drying and shrinkage of wood framing lumber after construction. As the wood shrinks, the drywall remains stationary, and the fastener head can push through the joint compound, creating a 'pop.' While other factors can contribute, lumber shrinkage is the primary reason, particularly in the first few years of a new home.
Question 6: According to the InterNACHI Standards of Practice for inspecting interior components, which of the following is an inspector specifically required to do?
- Inspect for safety glazing in hazardous locations.
- Report on the condition of paint and wallpaper.
- Inspect the stairs, steps, landings, and handrails. (Correct answer)
- Evaluate the fastening of kitchen countertops and cabinets.
Correct answer: Inspect the stairs, steps, landings, and handrails.
The InterNACHI Standards of Practice, Section 3.10, explicitly requires the inspector to inspect 'stairs, steps, landings, stairways and ramps' and 'railings, guards and handrails'. The standards specifically exclude inspecting for safety glazing, finish treatments like paint, and evaluating the fastening of countertops and cabinets.
InterNACHI - International Association of Certified Home Inspectors Interior Components and Finishes Questions and Answers
While inspecting a recently built home, you observe that the solid hardwood flooring on the main level is 'cupping,' with the edges of the boards being slightly higher than their centers.
What is the most likely cause of this condition?