InterNACHI Exterior and Grounds Inspection 3 — Questions and Answers
Question 1: Which type of retaining wall deficiency is considered a safety hazard during an exterior inspection?
- Efflorescence on block surface
- Leaning or bulging wall with no weep holes (Correct answer)
- Mortar joint discoloration
- Vegetation growing at wall base
Correct answer: Leaning or bulging wall with no weep holes
A leaning or bulging retaining wall without weep holes indicates hydrostatic pressure buildup that can cause catastrophic wall failure.
Question 2: What does the presence of stair-step cracking in brick veneer most commonly indicate?
- Normal thermal expansion
- Differential settlement of the foundation (Correct answer)
- Overloading of the brick wall
- Improper mortar mix ratio
Correct answer: Differential settlement of the foundation
Stair-step cracks follow mortar joints and typically indicate differential foundation settlement, which can be a significant structural concern.
Question 3: An inspector sees that a downspout terminates at the foundation wall with no extension. What is the recommended correction?
- Replace the downspout with a larger diameter pipe
- Add a splash block or extension to direct water at least 6 feet from the foundation (Correct answer)
- Install a gutter guard on the associated gutter
- Paint the downspout to prevent corrosion
Correct answer: Add a splash block or extension to direct water at least 6 feet from the foundation
Downspouts should discharge water well away from the foundation to prevent soil saturation and basement water intrusion.
Question 4: What is the InterNACHI-recommended minimum clearance between wood framing or siding and the soil grade?
- 2 inches
- 4 inches
- 6 inches (Correct answer)
- 12 inches
Correct answer: 6 inches
InterNACHI standards recommend at least 6 inches of clearance between wood elements and soil to reduce rot and termite risk.
Question 5: When inspecting vinyl siding, which defect is most likely to allow bulk water entry?
- Siding installed with tight nailing (no expansion gap)
- Missing J-channel or unsealed penetrations at openings (Correct answer)
- Slight wave pattern in siding panels
- Color fading on south-facing walls
Correct answer: Missing J-channel or unsealed penetrations at openings
Missing J-channel or unsealed gaps around windows, doors, and penetrations leave openings where bulk water can enter behind the siding.
Question 6: Which observation at a wood deck most directly indicates inadequate structural support?
- Deck boards are spaced 1/4 inch apart
- Posts are notched more than one-third of their depth for beam bearing (Correct answer)
- Handrail balusters are spaced 4 inches apart
- Decking is installed perpendicular to joists
Correct answer: Posts are notched more than one-third of their depth for beam bearing
Notching posts more than one-third of their depth significantly reduces load capacity and can lead to post splitting or failure.
Question 7: What is the primary concern when a driveway shows significant heaving near the garage apron?
- Vehicle damage from uneven surface
- Potential freeze-thaw or tree root movement affecting adjacent foundation (Correct answer)
- Driveway material has exceeded its service life
- Poor original concrete mix design
Correct answer: Potential freeze-thaw or tree root movement affecting adjacent foundation
Heaving near the garage apron can indicate frost or root intrusion that may also be affecting the garage foundation or slab.
InterNACHI Exterior and Grounds Inspection 3
Which type of retaining wall deficiency is considered a safety hazard during an exterior inspection?