Roof Deck Span Load Table

Joist and rafter span tables.

Roof deck span load table.

The species of lumber size of lumber and the load it carries. Loads shown in the shaded areas are governed by the live load deflection. Allowable loads given in tables 1 through 5 are for the simple span and controlled random layup arrange ments. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Results are output in a convenient downloadable pdf. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Load tables are calculated using section properties based on the steel design. A maximum roof pitch of 25 degrees is assumed.

Simply input your project data and our tool will customize your load tables or diaphragm designs from among more than 73 000 permutations. View joist rafter tables. Effects of support width have been considered when determining the loads based on shear and deflection. Beam span maximums are based on a maximum anticipated live load.

Building codes for residential decks only require 40 psf. For strength axis parallel to supports tables are based on three spans for spans of 16 inches or less and two spans for 24 inches. The tables do not apply directly to panels having a single span. Thickness shown in the steel deck institute sdi design manual.

Check plans to determine span and on center spacing design conditions check codes for allowable live load snow load dead load and deflection select appropriate span table match span in table to design condition and determine minimum fb and e values listed in the span table select appropriate. Our new interactive deck tools provide the fastest way to generate your load tables and diaphragm designs for roof composite and form deck. Not in excess of l 240 of the span. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

The allowable loads given in tables 3 through 5 are based on a maximum moisture content of 19 for 3 and 4 inch decking. Fewer posts on upper level decks are typically more desirable to the occupants and this drives the use of larger framing materials for longer spans. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Technical diagram span tables f7 rafters on page 35 30mm m aximum allow able sp ans mm sheet roof spacing mm rafter size 600 760 900 1000 1200 66 x 30 1250 1150 1050 1000 950 90 x 30 1650 1550 1550 1400 1300 138 x 30 2600 2300 2150 2000 1800 185 x 30 3000 2650 2450 2350 2150 230 x 30 3050.