Timber Floor Joist Lengths

1 psf lb f ft 2 47 88 n m 2.

Timber floor joist lengths. Joist span and spacing is set by your local building code. 2 grade of douglas fir are indicated below. Dead load weight of structure and fixed loads 10 lbs ft 2. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Live load is weight of furniture wind snow and more. 1 ft 0 3048 m. The wood boards used as floor joists generally range in size from no smaller than 2 by 4 inches to no larger than 2 by 12 inches. In joist sizes the larger size such as 6 inches represents the height of the joists while the 2 inch size represents the.

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. 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. Choosing the correct floor joist size depends on your building application joist spacing and several other factors these include the length of the span as well as the type and grade of the lumber being used. 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.

Two by 6 inches is a joist size frequently used in both indoor floors and as deck joists. 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. Maximum floor joist span for no. Joist and rafter span tables.