Ceiling Joist Support Beam Span

Although 2 x 4 s are included in the official table they are not listed because it is never advised to use them.

Ceiling joist support beam span.

This will support a room ceiling that is 10 feet long on one side as in 10 foot by 15 foot or 10 foot by 17 foot rooms which is a standard dimension for many rooms in residential construction. For example the highlighted cell below shows that a 2 x 6 southern yellow pine joist with a grade of 2 and spaced 24 apart can have a maximum span of 10 feet 0 inches 10 0 if you are designing your structure to support a plaster ceiling. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. It covers 2 common lumber species and sizes at 20 pounds per square foot load.

Large room joist spacing. 2 x 12 s are not listed because you can span pretty much whatever you want. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Sixteen inch oc spacing of ceiling joists made from 2 southern pine allows for a maximum 13 inch span length.

View joist rafter tables. 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.