Commercial Building Inspector B2Footings and FoundationsMedium
A commercial building inspector is reviewing plans for a new single-story warehouse. The plans indicate that the foundation walls are constructed of masonry. According to the 2021 IBC, what is the minimum nominal thickness required for exterior masonry foundation walls supporting a single-story structure?
- A8 inches
- B10 inches
- C12 inches
- D6 inches
Show answer & explanationAnswer & explanation
Correct answer: A. 8 inches
IBC Section 1805.5.4.1 specifies minimum thicknesses for masonry foundation walls. For single-story structures, the minimum nominal thickness for exterior masonry foundation walls is 8 inches.
Why the other options are wrong
- B. 10 inches is a common thickness but not the minimum required for a single-story building.
- C. 12 inches is typically required for taller or more heavily loaded structures, or as specified by engineered design.
- D. 6 inches is generally too thin for structural masonry foundation walls supporting a single-story building.
Masonry Foundation Wall Thickness
The minimum required nominal thickness for masonry foundation walls, based on the building's height and load.
- Thickness ensures stability and load-bearing capacity.
- Varies with number of stories supported.
- May increase with backfill height or specific design requirements.
Memory trick: Wall thickness depends on how many stories it must uphold.