Maximum floor joist span for No. 1 and No. 2 Grade of Douglas fir are indicated below. Max. dead load (weight of structure and fixed loads) 10 lbs/ft2. Live load is weight of furniture, wind, snow …

Joist span table - use these span tables to determine maximum spans based on the species and grade of lumber, the size of the floor joists, the spacing of the floor joists, and either of these …

Using span tables to size joists and rafters is a straight-forward process when you understand the structural principles that govern their use.

Design values and span tables for Western Lumber along with supporting publications.

Spans for dimensional lumber floor and ceiling joists can be calculated using the American Wood Council's Maximum Span Calculator for Wood Joists and Rafters. For sill plates in contact with concrete or masonry foundations, use pressure-treated wood to …

A typical double 2×12 header can span up to 8 feet, while a typical triple 2×12 header can span up to 10 feet. In addition, a typical quadruple 2×12 header can span up to 12 feet. Typically for a residential construction, a #2-DFL 2×10 header can typically span from 7-10 feet.

These span tables for joists and rafters are calcu-lated on the basis of a series of modulus of elasticity (E) and bending design values (F b). Additionally, compres-sion perpendicular to grain design values (F ) are. included as a consideration for selection of joists and rafters.

Resources provide a simplified system to determine allowable joist and rafter spans in one- and two-family dwellings, and the companion supplements for tabulating allowable bending and modulus of elasticity design values for visually graded …

SPFA 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.

Span, for joists and rafters, is the clear distance between sup-ports. For sloping rafters, the span is measured along the horizon-tal projection. The maximum spans provided in these tables were determined according to criteria set forth by the American Forest & Paper Association in its code-recognized Span Tables for Joists and Rafters.