Residential Building Inspector B1Wall Construction and Wall CoveringsMedium
A residential building inspector is reviewing the plans for a new two-story dwelling. The plans indicate that the exterior walls will be constructed using 2x6 wood studs, and the building is located in an area with a basic wind speed of 110 mph. What is the maximum height permitted for a non-load-bearing interior wood stud wall constructed with 2x4 studs spaced 16 inches on center, without specific engineering design, assuming standard conditions?
- A10 feet
- B8 feet
- C12 feet
- D9 feet
Show answer & explanationAnswer & explanation
Correct answer: A. 10 feet
For non-load-bearing interior wood stud walls constructed with 2x4 studs spaced 16 inches on center, the maximum height permitted without specific engineering design is 10 feet, according to IRC Table R602.3(1). The exterior wall construction or wind speed does not affect this specific interior non-load-bearing wall height limit.
Why the other options are wrong
- B. 8 feet is a common wall height but not the maximum permitted for this configuration.
- C. 12 feet would exceed the prescriptive limits for 2x4 non-load-bearing walls at 16 inches on center and would typically require engineering.
- D. 9 feet is also a common wall height, often found in residential construction, but not the maximum allowed.
Non-Load-Bearing Interior Wall Height
The maximum vertical dimension allowed for interior walls that do not support structural loads, based on stud size and spacing.
- IRC Table R602.3(1) provides prescriptive limits.
- Applies to non-load-bearing walls only.
- Exceeding limits requires engineering.
Memory trick: Interior walls have a height cap, based on their skinny or wide studs and how far apart they are.