Maximum clear span of purlins supporting decking or sheeting (Timber strength class C16)

Table 4B.41 Maximum clear span of purlins supporting decking or sheeting (m); Roof pitch more than 10° but not more than 35°; Imposed load of 0.75 kN/m2; Timber strength class C16 C16 Dead Load [kN/m2] excluding the self weight of the purlin Size of purlin (mm): Not more than 0.25 / More than 0.25 but not more than 0.50 / More than 0.50 but not more than 0.75 Design spacing of purlins (mm): 900, 1200, 1500, 1800, 2100, 2400 (repeated for each dead load category) 50 x 100: 1.68, 1.63, 1.51, 1.42, 1.34, 1.28 / 1.55, 1.48, 1.40, 1.31, 1.24, 1.18 / 1.45, 1.37, 1.31, 1.22, 1.16, 1.10 50 x 125: 2.24, 2.03, 1.88, 1.77, 1.67, 1.60 / 2.06, 1.88, 1.74, 1.63, 1.54, 1.47 / 1.91, 1.77, 1.63, 1.53, 1.44, 1.37 50 x 150: 2.68, 2.44, 2.26, 2.12, 2.01, 1.91 / 2.49, 2.26, 2.09, 1.96, 1.85, 1.76 / 2.34, 2.12, 1.96, 1.83, 1.73, 1.65 50 x 175: 3.12, 2.84, 2.63, 2.47, 2.34, 2.23 / 2.90, 2.63, 2.43, 2.28, 2.16, 2.06 / 2.72, 2.47, 2.28, 2.13, 2.02, 1.92 50 x 200: 3.56, 3.24, 3.00, 2.82, 2.67, 2.55 / 3.31, 3.00, 2.78, 2.60, 2.46, 2.35 / 3.11, 2.81, 2.60, 2.44, 2.30, 2.19 50 x 225: 4.00, 3.63, 3.37, 3.17, 3.00, 2.86 / 3.71, 3.37, 3.12, 2.93, 2.77, 2.64 / 3.49, 3.16, 2.92, 2.74, 2.59, 2.47 63 x 100: 1.87, 1.77, 1.64, 1.54, 1.46, 1.39 / 1.72, 1.64, 1.51, 1.42, 1.34, 1.28 / 1.60, 1.52, 1.42, 1.33, 1.26, 1.20 63 x 125: 2.42, 2.20, 2.04, 1.92, 1.82, 1.73 / 2.25, 2.04, 1.89, 1.77, 1.68, 1.60 / 2.10, 1.91, 1.77, 1.66, 1.57, 1.50 63 x 150: 2.90, 2.63, 2.44, 2.30, 2.18, 2.08 / 2.69, 2.44, 2.26, 2.12, 2.01, 1.92 / 2.53, 2.29, 2.12, 2.00, 1.88, 1.79 63 x 175: 3.37, 3.07, 2.85, 2.67, 2.54, 2.42 / 3.13, 2.84, 2.63, 2.47, 2.34, 2.23 / 2.94, 2.67, 2.47, 2.32, 2.19, 2.09 63 x 200: 3.84, 3.50, 3.25, 3.05, 2.89, 2.76 / 3.57, 3.24, 3.01, 2.82, 2.67, 2.55 / 3.36, 3.05, 2.82, 2.65, 2.51, 2.39 63 x 225: 4.31, 3.92, 3.64, 3.43, 3.25, 3.10 / 4.01, 3.64, 3.38, 3.17, 3.01, 2.87 / 3.77, 3.42, 3.17, 2.97, 2.82, 2.68