Ceiling Joist Calculator

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

Ceiling joist calculator. Then get an estimate of materials needed for your project. Span calculator for wood joists and rafters also available for the android os. 1 enter joist details 1 1 span and joist spacing.

Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor. We have engineered this calculator to provide spans which will produce a solid built house with no bounce in the floors or any swags in the ceiling. 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.

If this is the case with your structure use the floor joist table to determine maximum joist length load. The full version allows any size. The lowest is a plain ceiling joist with no storage 10 pounds per square foot.

Floor joist count instructions w enter the width of the floor across the joists l enter the length of the floor parallel to the joists. Also available for the android os. Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Drop ceiling calculator tell us your room dimensions and joist direction and we ll tell you how to lay out your 24 x 24 or 24 x 48 drop ceiling grid and provide an accurate materials estimate for your space. Span calculator for wood joists and rafters also available for the android os.

This is the distance between joist centres. There are six choices. The floor joist countcalculator computes the number of joists joists and end plates required for a floor or deck based on the dimension of the room or deck and the on center joist separation.