This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.
Rafter span roof joist span table.
Span calculator for wood joists and rafters also available for the android os.
Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value.
Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.
This rafter span calculator is species specific for douglas fir hemlock etc.
Limited to span in inches divided by 360.
For each application a pdf download is available.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Deflection for 30 psf live load.
More roof calculators roof truss calculator how to cut rafters.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure.
In making your choice consider how you will insulate your insulate your roof.
Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.
Also available for the android os.
Tables listing maximum spans for southern pine joists and rafters are detailed below.
Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria.
For lesser grades spans should be shorter.
Span tables for joists and rafters 3 american forest paper association table 9 1 required compression perpendicular to grain design values f c in pounds per square inch for simple span joists and rafters with uniform load.
The figures are based on quality materials.
View joist rafter tables.
To size joists and rafters use the maximum span tables for southern yellow pine.
Span ft 1 5 2 0 2 5 3 0 3 5 2 30 22181513 4 59 44363025 6 89 67534438 8 119 89 71 59 51.
The table states that 2 x 6 rafters spaced 16 inches on center o c can span a maximum distance of 13 feet 5 inches.
These 46 tables are based upon design values for visually graded southern pine dimension lumber that became effective june 1 2013.
