Roof Deck Span Table

Refer to the deck beam span table below to assist in determining the maximum span of a given beam between posts.

Roof deck span table.

View joist rafter tables. Two inch decking not less than 40 to be 14 ft. The 3 inch deep ribs make n deck ideal for longer span conditions where b deck falls short. Support spacing 6 ft three inch decking not less than 40 to be 14 ft.

A double 2x12 beam can span 12 feet. And longer not more than 10 to be less than 10 ft. Dimensional lumber deck beam span chart the numbers in gray indicate the distance between the support posts. The figures are based on quality materials.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. The profile contains 4 ribs and is 32 inches wide with male and female edges creating an interlocking side lap when installed. A dead load of 10 psf has been included. Type n profiles are 3 inch deep structural roof deck that provide both vertical load and diaphragm shear capacity.

Obviously the larger the beam the greater the distance it can span between posts. Thickness shown in the steel deck institute sdi design manual. Joist and rafter span tables. Not more than 1 to be 4 to 5 ft.

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. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Home building a deck deck beam.

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. Not in excess of l 240 of the span. 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.

Steel joists and steel deck load tables can facilitate the design of your next project featuring new millennium structural steel buildings systems. Loads shown in the shaded areas are governed by the live load deflection. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. A redwood 4x6 beam should span no more than 6 between supporting posts.