Floor Span Guide

The widest span in the floor joist span table in part 2 of this tutorial module showed that floor joists can span 17 2 if they are 2 x 12s spaced 12 o c.

Floor span guide. Wood beam calculator american wood council website rafter and joist span faq. 1 ft 0 3048 m. Fire safe construction 3 floor performance and tj pro rating 4 5 section 1. Continuing on from part 1.

1 psf lb f ft 2 47 88 n m 2. Joist span and spacing is set by your local building code. Span calculator for wood joists and rafters also available for the android os. Also available for the android os.

While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length. True floor joist span calculations can only be made by a structural engineer or contractor. Live load is weight of furniture wind snow and more. The lengths and sizes of joists vary depending on the species and quality of the lumber used.

Let s expand our house beyond that 17 2 span capability to 24 feet wide. Dead load weight of structure and fixed loads 10 lbs ft 2. Floor span tables 1 web stiffeners are required at intermediate supports of continuous span joists when the intermediate bearing length is less than 51 4 and the span on either side of the intermediate bearing is greater than the following spans. So the house dimensions will now be 24 x 13.

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. Residential structural design vertical structural forces we were about to start learning about floor joist span tables. View joist rafter tables. Maximum floor joist span for no.

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started. 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. Using floor joist span tables.

9 16 tji joists design properties 6 floor span and load tables 7 8 tips for preventing floor noise 8 allowable holes 9 cantilevers 10 11 roof span and load tables 12 13 framing connectors 14 15. Long term deflection under dead load which includes the effect of creep has not been. Tji joist specifier s guide tj 4000 july 2019.