A 2×10 Douglas Fir joist with a span of 16 feet is loaded beyond its capacity according to span tables. What is the best solution?
Correct Answer
A) Upgrade to a 2×12 or use engineered lumber
When a joist is overloaded according to span tables, the most effective solution is to upgrade to a larger member (2×12) or use engineered lumber like LVL or I-joists. This directly addresses the structural inadequacy.
Why This Is the Correct Answer
When a joist is loaded beyond its capacity according to span tables, the structural inadequacy must be addressed by increasing the load-carrying capacity of the member itself. Upgrading to a 2×12 provides significantly more section modulus and moment of inertia, directly increasing the joist's ability to handle bending loads. Engineered lumber like LVL or I-joists offers even greater strength-to-weight ratios and can span longer distances with higher loads. This solution directly addresses the root cause of the structural deficiency rather than attempting workarounds.
Why the Other Options Are Wrong
Option C: Reduce the joist spacing from 16" to 12" o.c.
Reducing joist spacing from 16" to 12" o.c. would require adding more joists, which helps distribute loads but doesn't solve the fundamental problem that each individual joist is still overloaded for the 16-foot span. The existing joists would still exceed their capacity even with closer spacing.
Option D: Install blocking between joists at mid-span
Installing blocking between joists at mid-span helps prevent lateral-torsional buckling and can improve load distribution, but it does not increase the load-carrying capacity of the individual joist members. The joists would still be structurally inadequate for the applied loads.
Memory Technique
Think 'UPGRADE THE MEMBER' - when capacity is exceeded, you need more capacity, not more members or accessories. Bigger lumber = bigger capacity.
Reference Hint
Florida Building Code Chapter 23 (Wood) or IRC Chapter 5 (Floors) - span tables for floor joists and allowable loads
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