Residential Floor Joist Span Table

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.

Residential floor joist span table.

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

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Continuing on from part 1. Floor joist span tables for various sizes and species of wood. 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.

Residential structural design vertical structural forces we were about to start learning about floor joist span tables. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Joist span and spacing is set by your local building code. View joist rafter tables.