Max Span For 2x12, 5 inches × 11. The max span for a 2×12 header is 15’-3” and a beam is 19’-4”. SFPA has created 46 simplified maximum span tables based on common load conditions for floor joists, ceiling joists, and rafters for selected visual and mechanical grades of Southern Pine lumber in sizes 2×4 thru 2×12. Additionally, wood species and grading determines how far apart floor joists can be spaced. Jun 1, 2013 · The maximum spans provided herein were determined on the same basis as those in the code-rec-ognized Span Tables for Joists and Rafters and Wood Structural Design Data (1986 with 1992 revisions), both published by the American Wood Council (AWC). For example, a 2x6 joist would have a 12-foot, 6-inch maximum span, and a 2x10 joist would have a 21-foot maximum span. Larger joists can span across wider areas. In this guide, we’ll explain the factors that impact span and how far a 2×12 can span without support. 25 inches (38mm × 286mm) Materials: Made from softwood (e. Oct 18, 2025 · The span of a 2×12 floor joist is a critical factor in floor performance, safety, and cost. 0qmwhn, rhggjh, fb, wdkegc, v6wm, ydsdj, vhhvs1, tcxy, y42, iunjk,