Residential Floor Joist Span Table

Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.

Residential floor joist span table. Using floor joist span tables. Floor joist span tables for various sizes and species of wood. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.

True floor joist span calculations can only be made by a structural engineer or contractor. Continuing on from part 1. Joist span and spacing is set by your local building code. High pitch 6 12 to 12 12 16 17 load bearing cantilever tables 18 21.

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. The maximum span is measured o c. Lp solidstart i joists technical guide for residential construction lpi. 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.

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. Low pitch 6 12 or less 14 15 roof span tables. The spans are based on simple span joists. Residential structural design vertical structural forces we were about to start learning about floor joist span 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. Design properties 16 floor span and load tables 17 allowable holes 18 roof span and load tables 19 cantilevers 20 21. For i joists we combine laminated veneer lumber lvl lp solidstart i joists have been evaluated by ccmc for. View joist rafter tables.

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Of bearings and is based on uniformly loaded joists. 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.