Max Floor Joist Span

2 grade of douglas fir are indicated below.

Max floor joist span.

Dead load weight of structure and fixed loads 10 lbs ft2. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. 1 psf lbf ft2 47 88 n m2. At least 40mm bearing on supports.

Span is clear span between supports. Live load is weight of furniture wind snow and more. Supporting imposed load for access and repair only. Floor joist span tables for surveyors floor construction surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors.

Span tables for domestic floor joists to bs 5268 7 1 note. Other span tables are based on the guidance given in bs 5268 7 1 which is a uniformly distributed load of 1 5kn m for spans greater than 2400 mm and 3 6 kn load per metre width of floor for spans less than 2400 mm to ensure that very small joist sizes do not result from the calculations for smaller spans. Also available for the android os. The above spans are based on american softwood lumber standard sizes.

The floor joist spacing is the distance between the centers of any two installed joists. Joist breadth 47mm. Span calculator for wood joists and rafters also available for the android os. Spacing of trusses are center to center in inches.

Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00. When choosing a joist spacing check that your floorboards or sheets are strong enough to span over the width chosen. As a general rule floorboards should be a minimum 16mm thick for joist centres up to 500mm and 19mm minimum for centres up to 600mm. Since the example house we are designing for is 12 feet wide we need to find in the floor joist span table a joist size and centering that can span 12 or wider.

Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. Maximum slop3 10 deg. These allowable spans are based on nds 91. 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.

Maximum floor joist span for no.