Ceiling Joist Support Beam Span

View joist rafter tables.

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. 2 x 12 s are not listed because you can span pretty much whatever you want. 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. 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.

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. It covers 2 common lumber species and sizes at 20 pounds per square foot load. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.

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