Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Flat roof joists span.
The full version allows any size.
Use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.
1 psf lb f ft 2 47 88 n m 2.
2 are indicated below.
While every effort has been made to insure the accuracy of the information presented and special effort has been made to assure that the information reflects the state of the art neither the west coast lumber inspection bureau the american wood council nor its members assume any responsibility for any particular design prepared from this online span calculator.
Roof truss span chart.
Trusses with an asterisk that exceed 14 in height may be.
Live load is weight of furniture wind snow and more.
Also available for the android os.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
In these cases 2 inch by 10 inch lumber is often used for ceiling joists although trusses may be more practical.
Span tables for joists and rafters 3 american wood council 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.
To achieve maximum indicated spans trusses may require six or more panels.
Dead load weight of structure and fixed loads 15 lbs ft 2.
Span ft 1 5 2 0 2 5 3 0 3 5 2 30 22 18 15 13 4 59 44 36 30 25 6 89 67 53 44 38 8 119 89 71 59 51 10 148 111.
This demo version is fixed at 1m clear span.
1 enter joist details 1 1 span and joist spacing.
Flat the most economical flat truss for a roof is provided when the depth of the truss in inches is approximately equal to 7 of the span in inches.
Usually 400 450 or 600mm but any value can be used up to 610mm max.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.
Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope.
Flat roof joist calculator.
Span calculator for wood joists and rafters also available for the android os.
Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
1 ft 0 3048 m.
