Timber Floor Joist Span Tables Uk

This table uses commonly available uk regularised timber depths.

Timber floor joist span tables uk.

This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. 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. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. These span tables are the equivalent of other industry standard span tables and are calculated to the same standards.

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. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. Joists are to have minimum end bearing of 40mm. The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction.

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. Wane as allowed in bs 4978 2007 a2 2017 is permitted in all sections included in these span tables. Read the notes at the bottom of the table for assumptions references and related standards. These spans were calculated using our floor joist calculation engine.