Roof Deck Span Table

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.

Roof deck span table.

A double 2x12 beam can span 12 feet. 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. Two inch decking not less than 40 to be 14 ft.

Not in excess of l 240 of the span. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. And longer not more than 10 to be less than 10 ft.

Steel joists and steel deck load tables can facilitate the design of your next project featuring new millennium structural steel buildings systems. Obviously the larger the beam the greater the distance it can span between posts. A redwood 4x6 beam should span no more than 6 between supporting posts. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

A dead load of 10 psf has been included. The tables below give maximum spans for rafters and beams. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Type n profiles are 3 inch deep structural roof deck that provide both vertical load and diaphragm shear capacity.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. The 3 inch deep ribs make n deck ideal for longer span conditions where b deck falls short. Not more than 1 to be 4 to 5 ft. A 2 2x10 can span 10 feet and so on.

Dimensional lumber deck beam span chart the numbers in gray indicate the distance between the support posts. Home building a deck deck beam. Support spacing 6 ft three inch decking not less than 40 to be 14 ft. Refer to the deck beam span table below to assist in determining the maximum span of a given beam between posts.

Thickness shown in the steel deck institute sdi design manual. Joist and rafter span tables. Minimum length is limited to 75 of the span length i e for 8 ft. Load tables are calculated using section properties based on the steel design.