How far can I span a 2x10 Rafter? In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. Can a 2x10 span 20 feet? 2×10 floor joists can span up to 20'. However, this is for 12” o.c. ...
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