According to Michigan Building Code, what is the maximum spacing for floor joist bridging or blocking in residential construction?
Correct Answer
D) 8 feet on center
Michigan Building Code requires floor joist bridging or blocking at intervals not exceeding 8 feet on center to prevent lateral buckling.
Why This Is the Correct Answer
Michigan Building Code requires that floor joist bridging or blocking be installed at intervals not exceeding 8 feet on center. This requirement prevents lateral (sideways) buckling of floor joists, which can occur under load when joists are not laterally restrained. Bridging transfers loads between joists and keeps them plumb and aligned.
Why the Other Options Are Wrong
Option A: 12 feet on center
12 feet on center exceeds the maximum allowed spacing of 8 feet. Joists spanning more than 8 feet without lateral restraint are vulnerable to lateral-torsional buckling under floor loads, which can lead to floor bounce, squeaks, and structural failure.
Option B: 10 feet on center
10 feet on center is closer but still exceeds the 8-foot maximum. This is a common distractor that candidates select when they remember the rule is 'less than 12 feet' without recalling the specific 8-foot requirement.
Option C: 6 feet on center
6 feet on center is more conservative than required and would meet code, but it is not the maximum spacing — it represents over-engineering. The question asks for the maximum spacing, not the minimum or recommended spacing.
Memory Technique
Remember '8 feet, or joists won't behave straight.' Picture a floor joist as a tall, thin ribbon — without being grabbed at the middle (8 feet max), it can twist and lean. 'Bridge every 8 to keep joists straight.'
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