A contractor is installing 2x10 floor joists spanning 14 feet in a residential project. According to typical span tables, what is the maximum spacing allowed for these joists using Southern Pine lumber?
Correct Answer
D) 16 inches on center
For a 14-foot span using 2x10 Southern Pine joists, the maximum spacing is typically 16 inches on center to meet deflection and load requirements per standard span tables.
Why This Is the Correct Answer
For 2x10 Southern Pine floor joists spanning 14 feet, standard span tables limit the maximum spacing to 16 inches on center to ensure adequate structural performance. This spacing provides sufficient load-carrying capacity for typical residential live loads (40 psf) and dead loads while maintaining deflection limits of L/360 for live loads. The 16-inch spacing is the industry standard that balances structural requirements with material efficiency for this span and lumber size.
Why the Other Options Are Wrong
Option A: 19.2 inches on center
19.2 inches on center exceeds the maximum allowable spacing for 2x10 joists at 14-foot spans, potentially causing excessive deflection and inadequate load capacity.
Option B: 12 inches on center
24 inches on center is far too wide for 2x10 joists spanning 14 feet and would result in structural failure due to excessive deflection and inadequate load distribution.
Option C: 24 inches on center
12 inches on center is overly conservative and unnecessarily restrictive for this application, resulting in material waste and increased costs without structural benefit.
Memory Technique
Think '2x10 at 14 feet = Sweet 16' - the sweet spot for 2x10 joists at 14-foot spans is 16 inches on center maximum spacing.
Reference Hint
IRC Chapter 5 - Floors, Table R502.3.1(1) Floor Joist Spans for Common Lumber Species
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