Floor Span Guide

2 grade of douglas fir are indicated below.

Floor span guide.

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. The lengths and sizes of joists vary depending on the species and quality of the lumber used. Continuing on from part 1. 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.

For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots. View joist rafter tables. Dead load weight of structure and fixed loads 10 lbs ft 2. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

Let s expand our house beyond that 17 2 span capability to 24 feet wide. Tji joist specifier s guide tj 4000 july 2019. 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. Span calculator for wood joists and rafters also available for the android os.

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. True floor joist span calculations can only be made by a structural engineer or contractor. 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. 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.

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. Wood beam calculator american wood council website rafter and joist span faq. Long term deflection under dead load which includes the effect of creep has not been. Joist span and spacing is set by your local building code.

So the house dimensions will now be 24 x 13. Fire safe construction 3 floor performance and tj pro rating 4 5 section 1. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Maximum floor joist span for no.

1 psf lb f ft 2 47 88 n m 2. Live load is weight of furniture wind snow and more. Using floor joist span tables.