Timber Floor Joist Span Tables Uk

Wane as allowed in bs 4978 2007 a2 2017 is permitted in all sections included in these span tables.

Timber floor joist span tables uk.

The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction. These spans were calculated using our floor joist calculation engine. Span tables for domestic floor joists to bs 5268 7 1 note. This table uses commonly available uk regularised timber depths.

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. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance.

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. Joists are to have minimum end bearing of 40mm. Floor joist span tables for surveyors floor construction. The following examples which apply to solid timber members give an illustration of how to use span tables for domestic floor joists at 400mm centres.