Ceiling Joist Roof Span Calculator

This is the distance between joist centres.

Ceiling joist roof span calculator.

For example if building is 24 x 24 and has trusses and the load on the roof will be for 30 lb snow load and a ceiling with no storage will total out like this. Flat roof joists. 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. Flat roof joist calculator.

If a room is 10 inside to inside and the joists are cut 10 7 so they will bear fully on both walls then the span will be 10. In other words it is either going to be on an outside wall or somewhere on the inside. This demo version is fixed at 1m clear span. Also available for the android os.

Enter a span for the joist. Span calculator for wood joists and rafters also available for the android os. Usually 400 450 or. Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor.

This will be slightly less than the length of the board. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. 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. The load on an outside wall with clear span trusses is exactly half the load on each wall.

Also available for the android os. 1 enter joist details 1 1 span and joist spacing. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Finally select a type of lumber.

The full version allows any size.