A 2×10 Southern Pine joist spans 14 feet and supports a live load of 40 psf plus dead load of 20 psf. The joists are spaced 16 inches on center. Is this span acceptable according to typical span tables?
Correct Answer
A) Yes, well within limits
A 2×10 Southern Pine joist at 16" o.c. can typically span up to 16-17 feet with a 40 psf live load and 20 psf dead load, so 14 feet is well within acceptable limits according to standard span tables.
Why This Is the Correct Answer
A 2×10 Southern Pine joist at 16" on center spacing can typically support spans of 16-17 feet when carrying a combined load of 60 psf (40 psf live + 20 psf dead). Since the actual span of 14 feet is significantly less than the maximum allowable span of 16-17 feet, this joist is well within acceptable limits according to standard residential span tables.
Why the Other Options Are Wrong
Option B: Cannot determine without deflection criteria
This option is incorrect because 14 feet is not at the maximum limit. The maximum span for a 2×10 Southern Pine joist under these conditions is typically 16-17 feet, making 14 feet comfortably within the allowable range with a safety margin of 2-3 feet.
Option C: Yes, but at maximum limit
This option is incorrect because the span does not exceed the limit. Standard span tables for 2×10 Southern Pine joists at 16" o.c. with 60 psf total load allow spans up to 16-17 feet, which is greater than the 14-foot span in question.
Memory Technique
Use the '2×10 = 16' rule: A 2×10 joist typically spans about 16 feet max under standard residential loads. If your span is noticeably less (like 14 feet), you're in good shape.
Reference Hint
IRC Table R502.3.1(1) - Floor Joist Spans for Common Lumber Species, or AWC Span Tables for Joists and Rafters
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