Roof Deck Span Table

Type n profiles are 3 inch deep structural roof deck that provide both vertical load and diaphragm shear capacity.

Roof deck span table.

Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Not more than 1 to be 4 to 5 ft. And longer not more than 10 to be less than 10 ft. A double 2x12 beam can span 12 feet.

A dead load of 10 psf has been included. Minimum length is limited to 75 of the span length i e for 8 ft. 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. Refer to the deck beam span table below to assist in determining the maximum span of a given beam between posts.

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. A 2 2x10 can span 10 feet and so on.

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. Load tables are calculated using section properties based on the steel design.

Thickness shown in the steel deck institute sdi design manual. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. A redwood 4x6 beam should span no more than 6 between supporting posts. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

View joist rafter tables. The 3 inch deep ribs make n deck ideal for longer span conditions where b deck falls short. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Joist and rafter span tables.

The profile contains 4 ribs and is 32 inches wide with male and female edges creating an interlocking side lap when installed. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. The tables below give maximum spans for rafters and beams. The figures are based on quality materials.