Floor Joist Design Tables

Don t worry you won t need to do a lot of calculations in determining the size and placement of the structural framing within your house design.

Floor joist design tables.

True floor joist span calculations can only be made by a structural engineer or contractor. 2 umber design values l use of these span tables requires reference to the applicable design values for the various species and grades of lumber. Continuing on from part 1. The dimensional stability of tji joists help them resist warping twisting and shrinking that can lead to squeaky floors.

Apa performance rated i joists pris are manufactured in accordance with pri 400 performance standard for apa ews i joists form x720 this performance standard provides an easy to use table of allowable spans for applications in residential floor construction allowing designers and builders to select and use i joists from various member manufacturers using just one set of span. The floor joist span tables are based on the loadings given in the amended version of bs 6399 1 which is an imposed load of either a uniformly distributed load of 1 5 kn m or a concentrated load of 1 4 kn. Also available for the android os. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.

Click here for background information regarding design values. Tables w 1 and w 2 of design values for joists and rafters a supplement to these span tables provide such values for them ostc ommonly used framing sizes. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Engineered wood products ewp span and size charts for bci joists.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Using floor joist span tables. Span calculator for wood joists and rafters also available for the android os. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.

View joist rafter tables. The 1 grade material is more expensive than the 2 grade but if you can use fewer or smaller 1 grade joists or rafters in your design you may actually save money. Residential structural design vertical structural forces we were about to start learning about floor joist span tables.