Maximum clear span of flat roof joists for limited-access roofs

Maximum clear span of flat roof joists (m); Access not limited to the purposes of cleaning and maintenance; Imposed load 1.50 kN/m2; Timber strength class C24 Table provides maximum clear spans for joist sizes from 38 x 120 mm to 75 x 220 mm (and CLS/ALS sizes 38 x 140 and 38 x 184), with joist spacings of 400 mm, 450 mm, and 600 mm, across dead loads ranging from not more than 0.50 kN/m² to more than 0.75 but not more than 1.00 kN/m² (excluding self weight of joist).