Maximum Floor Joist Span

The illustrations one for cantilever joists and one for flush rim beam hung joists point out where joist span measurements are taken from the saddle of the ledger mounted joist hanger to the center of a dropped beam or saddle of the.

Maximum floor joist span.

Live load is weight of furniture wind snow and more. Joist span and spacing is set by your local building code. Dead load deflection is limited to l 360 and total load deflection is limited to l 240. 2 lumber grade all joists are bridged sample floor joist span table.

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. The maximum span is measured o c. These tables can also be used to determine deck joist span. Span entries are listed for 2 6 through 2 12 joists and 12 in 16 in and 24 in.

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. 2 grade of douglas fir are indicated below. With these factors the lightest joist will have a maximum span of 17 feet 8 inches. Also available for the android os.

Of bearings and is based on uniformly loaded joists. The spans are based on simple span joists. The table excerpt above is simply a sample and may not be valid for your region. For example in the joist span table below the highlighted cell shows that 2 x 8 southern yellow pine joists that have a grade of 2 and are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2.

True floor joist span calculations can only be made by a structural engineer or contractor. Dead load weight of structure and fixed loads 10 lbs ft 2. Maximum floor joist span for no. Douglas fir larch lumber species no.

This is the most common as the typical span is 15 feet. Span calculator for wood joists and rafters also available for the android os. 1 ft 0 3048 m. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel.

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. Span refers to the length of the i joist. 1 psf lb f ft 2 47 88 n m 2.