During a framing inspection, a building official notes that wall studs are spaced at 19.2 inches on center instead of the typical 16 inches. Under what condition would this be acceptable according to Michigan Building Code?
Correct Answer
B) Acceptable if using engineered lumber or 2x6 studs with proper design
Michigan Building Code allows 19.2" OC spacing when using engineered lumber or with proper structural design, typically with 2x6 or larger studs.
Why This Is the Correct Answer
Michigan Building Code (which adopts the IRC) allows alternative stud spacing beyond the standard 16" OC when supported by proper engineering — such as using engineered lumber (LVL, LSL studs) or larger dimensional lumber (2x6) with appropriate structural design. The 19.2" spacing is a recognized advanced framing (optimum value engineering) technique when properly designed.
Why the Other Options Are Wrong
Option A: Only acceptable in single-story construction
The code does not restrict alternative stud spacing solely to single-story construction. Multi-story homes can also use 19.2" OC spacing with proper engineering approval, so this is an overly narrow restriction.
Option C: Never acceptable for residential construction
19.2" OC spacing is explicitly recognized in advanced framing standards and by code with appropriate design. Stating it is 'never acceptable' is factually incorrect.
Option D: Only acceptable for non-load bearing walls
19.2" OC spacing is not limited to non-load bearing walls. Load-bearing walls can use this spacing when engineered design supports it. Limiting it only to non-load bearing walls misrepresents the code.
Memory Technique
19.2" OC = Advanced Framing / Optimum Value Engineering (OVE). Remember: 16" is standard, 19.2" is allowed with engineering or larger lumber (2x6+). Think '19.2 = engineered exception.'
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