Timber Floor Joist Span Tables Uk

Span tables determine the size of a timber member of a particular strength class required for a given span as well as the maximum spacing between each section or timber member.

Timber floor joist span tables uk.

This table uses commonly available uk regularised timber depths. Read the notes at the bottom of the table for assumptions references and related standards. 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. 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.

Joists are to have minimum end bearing of 40mm. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance. The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction. Wane as allowed in bs 4978 2007 a2 2017 is permitted in all sections included in these span tables.

These spans were calculated using our floor joist calculation engine. These span tables are the equivalent of other industry standard span tables and are calculated to the same standards. Span tables for domestic floor joists to bs 5268 7 1 note. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.