4x8 Floor Joist Span

Span entries are listed for 2 6 through 2 12 joists and 12 in 16 in and 24 in.

4x8 floor joist span. This article explains typical spans for deck joists deck beams and deck flooring giving both standard span tables and a quick rule of thumb that works pretty well. The numbers in gray indicate the distance between the support posts. 10 lb dead load 40 lb live load answered by a verified structural engineer we use cookies to give you the best possible experience on our website. Live load is weight of furniture wind snow and more.

Joist span and spacing is set by your local building code. A 2 2x10 can span 10 feet and so on. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.

Span calculator for wood joists and rafters also available for the android os. 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. Span lengths for 4x6 4x8 4x10 2 fir. Also available for the android os.

2 grade of douglas fir are indicated below. Dead load weight of structure and fixed loads 10 lbs ft 2. The larger the deck the larger the joists. Span calculator for wood joists and rafters also available for the android os.

Maximum floor joist span for no. Our page top photo shows a small deck addition to a 1920 s bungalow in poughkeepsie ny. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Recommended or allowable joist beam spans.

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. Dimensional lumber deck beam span chart. 1 ft 0 3048 m. When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches.

For best results refer to our wood and composite deck joist span table. Also available for the android os. A double 2x12 beam can span 12 feet.