In wood frame construction, what is the maximum spacing allowed for 2x10 floor joists spanning 14 feet in a residential application?
Correct Answer
C) 16 inches on center
According to span tables for residential construction, 2x10 floor joists spanning 14 feet typically require 16-inch on center spacing to meet deflection and load requirements. Wider spacing would exceed allowable limits.
Why This Is the Correct Answer
For 2x10 floor joists spanning 14 feet in residential construction, 16 inches on center is the maximum allowable spacing according to standard span tables. This spacing ensures the joists can handle the required live loads (typically 40 psf) and dead loads while maintaining deflection limits of L/360 for live loads. Wider spacing would cause excessive deflection and potentially unsafe conditions, while closer spacing, though acceptable, is not the maximum allowed.
Why the Other Options Are Wrong
Option A: 19.2 inches on center
24 inches on center is far too wide for 2x10 joists spanning 14 feet. This spacing would create dangerous deflection levels and fail to meet residential floor load requirements, potentially causing structural failure.
Option B: 24 inches on center
12 inches on center spacing is overly conservative and unnecessarily close for this span. While this spacing would certainly work structurally, it's not the maximum allowed spacing, making it an incorrect answer to the question asked.
Option D: 12 inches on center
19.2 inches on center exceeds the maximum allowable spacing for 2x10 joists at a 14-foot span. This spacing would result in deflection that exceeds code limits and could compromise structural integrity.
Memory Technique
Use the rhyme 'Sweet Sixteen' - 2x10 joists at 14 feet max out at 16 inches on center. Also remember that 16" OC is the most common residential framing spacing.
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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