Timber Joist Floor Spans

Maximum floor joist span for no.

Timber joist floor spans. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Joist spans 2 5m to 4 5m provide strutting at mid span. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders. 2 grade of douglas fir are indicated below.

Where the tables do not apply or where there are concentrated loads floor joists should be designed by an engineer in accordance with technical requirement r5. View allowable load tables. Dead load weight of structure and fixed loads 10 lbs ft 2. 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 these tables can also be used to determine deck joist span.

Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. 1 psf lb f ft 2 47 88 n m 2. Solid timber strutting to be at least 38mm thick and be a minimum of three quarters of the joist depth.

Timber floor joists shall be adequate for the spans and loads and be correctly installed. Joist spans over 4 5m provide 2 rows of strutting at third span positions. Span tables for domestic floor joists to bs 5268 7 1 note. The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Floor joist span tables for various sizes and species of wood. Also available for the android os. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance.

1 ft 0 3048 m. View size selection tables. View joist rafter tables. Span calculator for wood joists and rafters also available for the android os.

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. Live load is weight of furniture wind snow and more. All the figures are based on normal domestic floor loadings where the floor construction is typically 18 25mm floor boards sheets with up to 12 5mm thick plasterboard and skim underneath.