Lumber Joist Span Estimator
Determine maximum safe clear spans for 2x6, 2x8, 2x10, and 2x12 joists based on IRC structural tables.
Max Clear Span Capacity
12 Ft 7 In
Maximum Unsupported Clear Span (L/360 Deflection)
Design Live Load: 40 lbs / sq ft (Residential Floor)
Design Dead Load: 10 lbs / sq ft
IRC Table Reference: IRC Table R502.3.1(2)