What is the maximum spacing for 2×10 floor joists spanning 14 feet in a residential application using Southern Pine lumber?
Correct Answer
C) 16 inches on center
According to span tables, 2×10 Southern Pine joists can span 14 feet at 16 inches on center for residential floor loads. Closer spacing would be acceptable but not required for this span.
Why This Is the Correct Answer
According to standard span tables for Southern Pine lumber, 2×10 joists can safely span 14 feet when spaced 16 inches on center for typical residential floor loads (40 psf live load, 10 psf dead load). This spacing provides adequate structural support while being economical. The span tables are based on deflection limits and bending stress calculations that ensure the floor system meets code requirements.
Why the Other Options Are Wrong
Option A: 19.2 inches on center
24 inches on center spacing is too wide for 2×10 joists spanning 14 feet and would result in structural inadequacy, excessive deflection, and code violations.
Option D: 24 inches on center
19.2 inches on center spacing would exceed the maximum allowable spacing for 2×10 joists spanning 14 feet, potentially causing excessive deflection and failing to meet code requirements.
Memory Technique
Think '2×10 at 16' - the most common residential floor joist configuration that works for most spans up to 14-15 feet.
Reference Hint
Florida Building Code Chapter 5 - Wood Frame Construction, or IRC Table R502.3.1(1) - Floor Joist Spans for Common Lumber Species
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