Beam Span Calculator

Find maximum beam span for dimensional lumber, LVL, glulam, and steel beams by load condition and tributary width.

πŸ“ Beam Span Calculator

Results

Max Span (8 ft trib.)13.0 ft
Adjusted Span13.0 ft

πŸ’‘ How to Determine Beam Span

Beam span depends on beam type, size, tributary load width (the area of floor or roof the beam supports), and load type (floor or roof). A larger tributary width means more load, which reduces allowable span. Standard tributary width is 8 feet for residential construction.

LVL (laminated veneer lumber) and glulam beams span farther than dimensional lumber and don't shrink, twist, or warp. Steel beams span the farthest. Common residential beams: doubled 2Γ—10 or 2Γ—12 for short spans, LVL for mid-range, steel for long spans and point loads.

LVL 1.75Γ—11.25, 8 ft tributary, floor load: max span ~13 ft. Same beam supporting a roof: ~17 ft. Steel W8Γ—18: floor span ~18 ft, roof ~24 ft.

Beam Span Calculator FAQ

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