Question 40
Domain 4: Wall Construction, Framing, and Exterior CoveringsWhat is the maximum allowable spacing for studs in exterior load-bearing walls per the IRC?
Correct answer: C
Explanation
The IRC permits studs in exterior load-bearing walls to be spaced up to "24 inches on center" when the wall is designed to carry the required loads. This spacing limit is used in the code’s framing provisions for load-bearing wall construction.
Why each option is right or wrong
A. 12 inches on center
B. 16 inches on center
C. 24 inches on center
IRC Section R602.3.1 requires studs in load-bearing walls to be spaced not more than 24 inches on center unless an engineered design or other specific code provision requires closer spacing. For exterior load-bearing walls, that 24-inch o.c. maximum is the standard prescriptive limit, so any spacing beyond 24 inches would fall outside the IRC allowance.
D. 32 inches on center