How far can a 2x10 span without support | 2x10 floor joist span, 2x10 ceiling joist span | 2x10 span 

How far can a 2x10 span without support | 2x10 floor joist span, 2x10 ceiling joist span | 2x10 span
The span of a 2x10 beam without supports depends on several factors, including the type of wood, the load it must carry (both live and dead loads), the spacing between the beams, and the intended use (floor joists, ceiling joists, or rafters).
Here are some general guidelines based on common building codes and practices:
1) Floor Joists: A 2x10 floor joist made from good quality wood (such as Douglas Fir, Southern Pine, or Hem-Fir) and spaced 16 inches apart can typically span up to 15 feet for residential loads (40 pounds per square foot live load and 10 pounds per square foot dead load).
2) Ceiling Joists: When used as ceiling joists (carrying only ceiling loads), a 2x10 can span up to 18 feet or more, depending on the wood species and grade.
3) Rafters: The span for rafters varies significantly with roof pitch, load, and other factors, but a 2x10 rafter might span around 19'-5", depending on the specifics.
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