This Section of MS 544 : Part 11 recommends a calculation basis for the permissible clear
span for simply supported domestic floor joists of solid timber. The recommendations apply to
joists at a maximum spacing of 610 mm centre-to-centre, this being the maximum spacing of
which the `load-sharing' assumption may be adopted as described in MS 544 : Part 2. The
method of calculation makes no allowance for any contribution of the flooring to the load
resistance of the joists where such action can be provided by adequate attachments between
the elements as in a stressed skin panel floor. Only uniform loading is considered whereas
concentrated or line loads applied by partition, trimmers and other similar causes are
excluded.
This Section of MS 544 : Part 11 is applicable to the species, strength and grades of timber
given in MS 544 : Part 2.