Roof Deck Span Table

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.

Roof deck span table.

A double 2x12 beam can span 12 feet. A 2 2x10 can span 10 feet and so on. A dead load of 10 psf has been included. Load tables are calculated using section properties based on the steel design.

Dimensional lumber deck beam span chart the numbers in gray indicate the distance between the support posts. Thickness shown in the steel deck institute sdi design manual. Obviously the larger the beam the greater the distance it can span between posts. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Steel joists and steel deck load tables can facilitate the design of your next project featuring new millennium structural steel buildings systems. View joist rafter tables. Loads shown in the shaded areas are governed by the live load deflection.

And longer not more than 10 to be less than 10 ft. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Not in excess of l 240 of the span. Two inch decking not less than 40 to be 14 ft.

Minimum length is limited to 75 of the span length i e for 8 ft. The figures are based on quality materials. The profile contains 4 ribs and is 32 inches wide with male and female edges creating an interlocking side lap when installed. When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches.

Home building a deck deck beam. Type n profiles are 3 inch deep structural roof deck that provide both vertical load and diaphragm shear capacity. Not more than 1 to be 4 to 5 ft. A redwood 4x6 beam should span no more than 6 between supporting posts.

Joist and rafter span tables. The 3 inch deep ribs make n deck ideal for longer span conditions where b deck falls short. The tables below give maximum spans for rafters and beams. Support spacing 6 ft three inch decking not less than 40 to be 14 ft.