You're building a retaining wall that will be 8 feet high. According to CBC, at what height does a retaining wall require special inspection for reinforced masonry construction?
Correct Answer
D) 6 feet
CBC requires special inspection for reinforced masonry retaining walls exceeding 6 feet in height to ensure proper construction.
Why This Is the Correct Answer
CBC requires special inspection for reinforced masonry retaining walls that exceed 6 feet in height. Since the wall in this scenario is 8 feet — exceeding the 6-foot threshold — special inspection is required. The trigger height is 6 feet, not the height of the specific wall being described.
Why the Other Options Are Wrong
Option A: 4 feet
4 feet is not the CBC threshold for special inspection of reinforced masonry retaining walls. While some jurisdictions require permits for walls over 3–4 feet, the special inspection trigger under CBC is 6 feet.
Option B: 10 feet
10 feet is too high a threshold; by that point many structural and geotechnical concerns have already been triggered. The CBC special inspection requirement begins at 6 feet, well before a wall reaches 10 feet.
Option C: 8 feet
8 feet is the height of the wall in the scenario — a distractor. The question asks what HEIGHT triggers the requirement, not how tall the wall is. The trigger is 6 feet, and the 8-foot wall simply exceeds that threshold.
Memory Technique
Think of the '6-foot rule' like a person's height — a wall taller than an average person (6 ft) needs an inspector watching over it. Once it's taller than you, someone official needs to be involved.
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