Depth Of Floor Joists Uk

A 2 by 10 joist is really only 9 1 4 inches wide and a 2 by 12 is only 11 1 4 inches wide so depending upon.

Depth of floor joists uk.

As a general rule of thumb the overall length of the joist span divided by 2 1 equals the depth of the joists. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. Dead load weight of structure and fixed loads 10 lbs ft 2. Eg joists spans 14 ft wall to wall dived by 2 1 8.

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. With extensive timber engineering and roof truss experience scotts of thrapston has partnered with wolf systems to offer the easi joist metal web floor system. Joists are to have minimum end bearing of 40mm. Live load is weight of furniture wind snow and more.

The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction. 2 grade of douglas fir are indicated below. Maximum floor joist span for no. 1 ft 0 3048 m.

The floor joists comprise the bulk of the floor thickness. The floor joist span tables are based on the loadings given in the amended version of bs 6399 1 which is an imposed load of either a uniformly distributed load of 1 5 kn m or a concentrated load of 1 4 kn. Note this only works in imperial and is for domestic loadings only. Floor joists ceiling joists flat roof joists rafters purlin span tables for domestic floor joists to bs 5268 7 1 note.

Standard floor joists are usually 2 by 10 or 2 by 12 dimensional boards installed on edge. True floor joist span calculations can only be made by a structural engineer or contractor. The use of engineered floor systems is growing in the uk replacing traditional solid timber floor joists or concrete flooring. This means that some values are slightly more conservative than span tables from other sources if those do not include the.

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