You're reviewing plans showing #4 rebar at 12 inches on center in both directions for a residential foundation wall. The wall is 8 feet high and 8 inches thick. What CBC requirement might be violated?
Correct Answer
B) Maximum spacing requirements
CBC typically requires closer spacing for foundation wall reinforcement, often 6-8 inches on center depending on wall height and soil conditions, making 12-inch spacing potentially inadequate.
Why This Is the Correct Answer
CBC Section 1807 and ACI 318 requirements for concrete foundation walls subjected to lateral soil pressure typically require vertical reinforcement spacing no greater than 8 inches on center for 8-foot-high walls, depending on soil conditions and wall thickness. The 12-inch spacing shown on the plans exceeds the maximum allowable spacing for this wall height and loading condition, potentially creating an under-reinforced wall that cannot adequately resist lateral soil and hydrostatic pressures.
Why the Other Options Are Wrong
Option A: Concrete cover requirements
Concrete cover requirements relate to the distance from the rebar centerline (or edge) to the face of the concrete, not to the spacing between bars. The plans show 12-inch spacing, which is a spacing issue, not a cover issue. Cover violations would be detected by checking bar placement depth, not bar-to-bar distance.
Option C: Development length
Development length refers to how far rebar must extend into or past a connection point (lap splices, hooks at footings) to achieve full bond strength. The question describes spacing within the wall panel, not bar termination or splice locations. Development length is a separate concern unrelated to the spacing described.
Option D: Minimum rebar size
Minimum rebar size for foundation walls under CBC is typically #4 (½-inch diameter), which is exactly what the plans specify. There is no violation of minimum bar size — #4 is the standard minimum for residential foundation walls. The violation is in how those bars are spaced, not in what size they are.
Memory Technique
For foundation walls: maximum spacing is often 8 inches on center for taller walls under soil pressure. Remember '8-foot wall = 8-inch max spacing' as a rough rule of thumb. When you see 12 inches on center for a tall residential foundation wall, flag it as a potential maximum spacing violation.
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