Ceiling Joist Roof Span Calculator

1 enter joist details 1 1 span and joist spacing.

Ceiling joist roof span calculator. The load on an outside wall with clear span trusses is exactly half the load on each wall. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Also available for the android os. The full version allows any size.

This will be slightly less than the length of the board. Finally select a type of lumber. 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. Span calculator for wood joists and rafters also available for the android os.

Flat roof joists. 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. Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists. Span calculator for wood joists and rafters also available for the android os.

Usually 400 450 or. 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. Enter a span for the joist. 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.

Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor. This demo version is fixed at 1m clear span. Also available for the android os. This is the distance between joist centres.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.