Residential Wood Floor Joist Span Table

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.

Residential wood floor joist span table. The spans are based on simple span joists. Joist span and spacing is set by your local building code. 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. Of bearings and is based on uniformly loaded joists.

View joist rafter tables. The maximum span is measured o c. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Using floor joist span tables.

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Residential structural design vertical structural forces we were about to start learning about floor joist span tables. Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span. Span ft 1 5 2 0 2 5 3 0 3 5 2 30 22 18 15 13 4 59 44 36 30 25 6 89 67 53 44 38 8 119 89 71 59 51 10 148 111.

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. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. 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. Continuing on from part 1.

The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel. The tables permit a bearing length of up to 3 5 inches but since 1 5 is probably the worst case that you ll encounter for joist or rafter bearing it s a safe value. Span tables for joists and rafters 3 american wood council table 9 1 required compression perpendicular to grain design values f c in pounds per square inch for simple span joists and rafters with uniform load. Floor joist span tables for various sizes and species of wood.

Table 9 1 in span tables for joists and rafters figure 5 gives a required compression value of 237 psi for a span of 16 feet and bearing length of 1 5 inches.