Ceiling Joist Roof Span Calculator

This demo version is fixed at 1m clear span.

Ceiling joist roof span calculator.

The full version allows any size. Flat roof joist calculator. If this is the case with your structure use the floor joist table to determine maximum joist length load. 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.

This is the distance between joist centres. In other words it is either going to be on an outside wall or somewhere on the inside. Enter a span for the joist. Also available for the android os.

1 enter joist details 1 1 span and joist spacing. Span calculator for wood joists and rafters also available for the android os. Span calculator for wood joists and rafters also available for the android os. 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.

Finally select a type of lumber. Also available for the android os. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. 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. Flat roof joists. This will be slightly less than the length of the board. 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.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.