Depth Of Floor Joists Uk

The floor joists comprise the bulk of the floor thickness.

Depth of floor joists uk.

1 psf lb f ft 2 47 88 n m 2. The use of engineered floor systems is growing in the uk replacing traditional solid timber floor joists or concrete flooring. Note this only works in imperial and is for domestic loadings only. 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.

Therefore joist depth is 8 inches. The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction. Dead load weight of structure and fixed loads 10 lbs ft 2. Maximum floor joist span for no.

Live load is weight of furniture wind snow and more. 2 grade of douglas fir are indicated below. Standard floor joists are usually 2 by 10 or 2 by 12 dimensional boards installed on edge. As a general rule of thumb the overall length of the joist span divided by 2 1 equals the depth of the joists.

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. The actual width of those boards however isn t identical to what their name implies. Eg joists spans 14 ft wall to wall dived by 2 1 8. True floor joist span calculations can only be made by a structural engineer or contractor.

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. This means that some values are slightly more conservative than span tables from other sources if those do not include the. The weight of the timber floor itself consists of the timber joists the plasterboard ceiling underneath it except for suspended timber ground floors the floorboards and the nails or screws used to fix both of the aforementioned coverings. 1 ft 0 3048 m.

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. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1.