For lesser grades spans should be shorter.
Roof joists span tables.
Span calculator for wood joists and rafters also available for the android os.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure.
Straight line interpolation shall be permitted for intermediate spans and design values.
Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.
Design information for all joists tji joist floor framing 24.
Design properties 16 floor span and load tables 17 allowable holes 18 roof span and load tables 19 cantilevers 20 21 framing connectors 22 23 section 3.
The figures are based on quality materials.
View joist rafter tables.
For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2.
Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor.
Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Roof span and load tables 12 13 framing connectors 14 15 section 2.
Joists rafters 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.
If this is the case with your structure use the floor joist table to determine maximum joist length load.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Span tables for ceiling joists to bs 5268 7 3 span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3.
These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center.
The tables below give maximum spans for rafters and beams.
Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists.
These span tables apply only to flat roof and roof with a slope of up to 10 degrees.
