A commercial building is being constructed with a wood floor system. The floor joists are 16 inches on center and are 2x10s. What is the minimum required thickness of the wood sheathing for this floor system?
- A3/4 inch
- B1 inch
- 1 1/4 inch
- D1 1/2 inch
Exam tip
Always check the specific joist spacing requirements for the minimum thickness of wood sheathing.
Why C is correct
According to Section 1604.1.1 of the 2021 IBC, wood sheathing for floors with joists spaced 16 inches on center must be a minimum of 1 1/4 inch thick. Option A is too thin, and options B and D are not the minimum required thickness.