Floor I Joist Span

Because i joists are straight and true it s easier for builders to avoid crowning and maintain a level framing surface.

Floor i joist span. Live load 30 lbs ft 2 1436 n m 2. Floor joist span tables for various sizes and species of wood. The l 480 table with a 40 per square foot live load and a 20 per square foot dead load with a depth of 11 7 8 inches will give you spans according to joint weight. 1 psf lb f ft 2 47 88 n m 2.

1 ft 0 3048 m. Also available for the android os. Common i joist applications i joists are used extensively in residential floor and roof framing. Span refers to the length of the i joist.

Maximum floor joist span for no. True floor joist span calculations can only be made by a structural engineer or contractor. Span calculator for wood joists and rafters also available for the android os. Using 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. With these factors the lightest joist will have a maximum span of 17 feet 8 inches. A few of the most common factors that affect joist span include. 1 in 25 4 mm.

These elements will greatly affect how far you can span your joists. 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. Live load is weight of furniture wind snow and more. Maximum span of 2x12 floor joist the most important design choices to consider when building a home are the species and grade of wood that is being used as well as joist size and spacing.

Residential structural design vertical structural forces we were about to start learning about floor joist span tables. Dead load weight of structure and fixed loads 10 lbs ft 2. This is the most common as the typical span is 15 feet. Continuing on from part 1.

These tables can also be used to determine deck joist span. 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.