Table 4B.19: Maximum clear span of rafters

Table 4B.19 Maximum clear span of rafters (m); Roof pitch more than 22.5° but not more than 30°; Imposed load 0.75 kN/m2; Timber strength class C16 Dead Load [kN/m2] excluding the self weight of the rafter Size of rafter (mm): 38 x 100, 38 x 125, 38 x 150, 47 x 100, 47 x 125, 47 x 150, 50 x 100, 50 x 125, 50 x 150, 38 x 89, 38 x 140 Dead load categories: Not more than 0.50 kN/m2; More than 0.50 but not more than 0.75 kN/m2; More than 0.75 but not more than 1.00 kN/m2 Spacing of rafters (mm): 400, 450, 600 Table provides maximum clear spans in metres for CLS/ALS timber and C16 timber strength class for each combination of rafter size, dead load, and spacing.