Maximum Length For Floor Joists

So we now have adequately sized floor joists and an adequately sized floor joist beam for our 24 x 13 house.

Maximum length for floor joists. The larger the deck the larger the joists. Span calculator for wood joists and rafters also available for the android os. Engineered floor joists can easily be cut to length. Next use the buttons in the table to select the maximum length in feet or metres in brackets that your floor joists must span.

2x10 to 15 feet and 2x12 to 18 feet. Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor. Also available for the android os. Let s say our house is 24 x.

2 grade of douglas fir are indicated below. Dead load weight of structure and fixed loads 10 lbs ft 2. 1 ft 0 3048 m. To use the joist span calculator below first select the species of lumber you will use for your construction project from the drop down list.

Floor joists are available in several depths and lengths that are sufficient for most residential and commercial building plans. Live load is weight of furniture wind snow and more. You should check with your local building department for construction requirements in your area. 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.

Our floor joist beam can span a maximum of 13. The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example. Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope. In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above.

What if we needed to span more than that. A 2x8 up to 12 feet. Maximum floor joist span for no. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

In the table above the widest floor beam span for 12 of supported floor joists is 14 7 if using a 5 ply 2 x 12. Floor joist span calculator. 1 psf lb f ft 2 47 88 n m 2. The typical engineered floor joist is made of lumber in the shape of an i thus commonly called an i joist.