Floor Span Guide

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.

Floor span guide.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. True floor joist span calculations can only be made by a structural engineer or contractor. 1 ft 0 3048 m. Maximum floor joist span for no.

Dead load weight of structure and fixed loads 10 lbs ft 2. Span calculator for wood joists and rafters also available for the android os. Fire safe construction 3 floor performance and tj pro rating 4 5 section 1. Long term deflection under dead load which includes the effect of creep has not been.

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. Joist span and spacing is set by your local building code. Continuing on from part 1. 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.

Wood beam calculator american wood council website rafter and joist span faq. 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. So the house dimensions will now be 24 x 13. Let s expand our house beyond that 17 2 span capability to 24 feet wide.

Residential structural design vertical structural forces we were about to start learning about floor joist span tables. 2 grade of douglas fir are indicated below. Also available for the android os. Tji joist specifier s guide tj 4000 july 2019.

View joist rafter tables. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots. 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. Live load is weight of furniture wind snow and more.

1 psf lb f ft 2 47 88 n m 2. 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. 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.