What size beam to span 24 ft:- as per general thumb rule and guidelines, a 4 nailed 2×18 or 4-2×18 or 8×18 size of wood beam can allow to span 24 feet. What size beam do I need to span 24 feet? Thus, a 4 nailed 2×16 or 4-2×16 or 8×16 wood beam can allow to span 20 feet. How big of a beam do I need to span 20 feet?įor a 20 foot span, you will need atleast 4-2×16 or 8×16 size of wood beam. Thus, 8 feet is maximum allowable span for a double 2×8 size header. What is the maximum span for a 2×8 header?Īs per general rules and guidelines, nominal size of a double 2×8 header can span upto 8 feet. For a 18-foot spans, the wood beam has to be at least 16 inches in depth and 6″ in width (3-2×16) used for residential building, wood frame structure or projects. Thus, for a 18 foot span, you will need atleast 3-2×16 or 6×16 size of wood beam. What size beam do I need for an 18 foot span? How far can a 2×6 floor joist span without support? For a 16-foot spans, the wood beam has to be at least 14 inches in depth and 6″ in width (3-2×14) used for residential building, wood frame structure or projects. Thus, a 3 nailed 2×14 or 3-2×14 or 6×14 wood beam can allow to span 16 feet. How big of a beam do I need to span 16 feet?įor a 16 foot span, you will need atleast 3-2×14 or 6×14 size of wood beam. A 2×12 (2-by-12) floor joists can span up to 23 feet 3 inches, 2×10 (2-by-10) up to 19 feet 1 inches, 2×8 (2-by-8) up to 15 feet & 2×6 (2-by-6) up to 11 feet 4 inches at 16″ spaced by using southern yellow pine graded as #1 when live load of 30 lbs/ft^2 & dead load of 10 lbs/ ft^2.
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