Live load is weight of furniture wind snow and more.
Span flat roof joist wood.
2 are indicated below.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
This demo version is fixed at 1m clear span.
They are ideal for long spans including continuous spans over intermediate supports.
These span tables apply only to flat roof and roof with a slope of up to 10 degrees.
Flat roof joist calculator.
Dead load weight of structure and fixed loads 15 lbs ft 2.
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.
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.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
Notches are not to exceed 0 125 of the depth of the joist and are to be located between 0 07 and 0 25 of the span from the support.
1 psf lb f ft 2 47 88 n m 2.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
This is the distance between joist centres.
Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.
Also available for the android os.
Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.
Common i joist applications i joists are used extensively in residential floor and roof framing.
The full version allows any size.
Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.
Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.
1 enter joist details 1 1 span and joist spacing.
Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface.
Span calculator for wood joists and rafters also available for the android os.
