Table 4B.30: Maximum clear span of purlins supporting rafters for roof pitch 30° to 45°

Table 4B.30 Maximum clear span of purlins supporting rafters (m); Roof pitch more than 30° but not more than 45°; Imposed load of 0.75 kN/m²; Timber strength class C24 C24 Dead Load [kN/m²] excluding the self weight of the purlin Size of purlin (mm): Dead load not more than 0.50 / More than 0.50 but not more than 0.75 / More than 0.75 but not more than 1.00 Design spacing of purlins (mm): 1500, 1800, 2100, 2400, 2700, 3000 for each dead load category 47 x 150: 2.06, 1.94, 1.83, 1.93, 1.81, 1.83 47 x 175: 2.41, 2.26, 2.13, 2.03, 1.95, 1.87 / 2.26, 2.11, 2.00, 1.90, 1.82, – / 2.13, 2.00, 1.88, –, –, – 47 x 200: 2.75, 2.58, 2.44, 2.32, 2.22, 2.14 / 2.57, 2.41, 2.28, 2.17, 2.08, 1.99 / 2.44, 2.28, 2.15, 2.05, 1.96, 1.88 47 x 225: 3.09, 2.89, 2.74, 2.61, 2.50, 2.40 / 2.89, 2.71, 2.56, 2.44, 2.33, 2.24 / 2.74, 2.56, 2.42, 2.30, 2.20, 2.11 63 x 125: 1.91, –, –, –, –, – 63 x 150: 2.29, 2.15, 2.03, 1.94, 1.86, – / 2.15, 2.01, 1.90, 1.81, –, – / 2.03, 1.90, 1.80, –, –, – 63 x 175: 2.67, 2.50, 2.37, 2.26, 2.17, 2.08 / 2.50, 2.35, 2.22, 2.12, 2.03, 1.95 / 2.37, 2.22, 2.10, 2.00, 1.91, 1.84 63 x 200: 3.04, 2.86, 2.71, 2.58, 2.47, 2.38 / 2.86, 2.68, 2.54, 2.42, 2.31, 2.23 / 2.70, 2.53, 2.40, 2.28, 2.19, 2.10 63 x 225: 3.42, 3.21, 3.04, 2.90, 2.78, 2.68 / 3.21, 3.01, 2.85, 2.72, 2.60, 2.50 / 3.04, 2.85, 2.70, 2.57, 2.55, 2.36 75 x 125: 2.03, 1.90, 1.80, –, –, – / 1.90, 1.80, –, –, –, – / –, –, –, –, –, – 75 x 150: 2.43, 2.28, 2.16, 2.06, 1.98, 1.91 / 2.28, 2.14, 2.03, 1.93, 1.85, – / 2.16, 2.03, 1.92, 1.83, –, – 75 x 175: 2.83, 2.66, 2.52, 2.40, 2.31, 2.22 / 2.66, 2.49, 2.36, 2.25, 2.16, 2.08 / 2.52, 2.36, 2.24, 2.13, 2.04, 1.96 75 x 200: 3.23, 3.03, 2.88, 2.74, 2.63, 2.54 / 3.03, 2.85, 2.70, 2.57, 2.47, 2.37 / 2.88, 2.70, 2.55, 2.43, 2.33, 2.24 75 x 225: 3.63, 3.41, 3.23, 3.08, 2.96, 2.85 / 3.41, 3.20, 3.03, 2.89, 2.77, 2.67 / 3.23, 3.03, 2.87, 2.74, 2.62, 2.52 2 x 47 x 200: 3.65, 3.43, 3.26, 3.11, 2.99, 2.88 / 3.43, 3.22, 3.06, 2.92, 2.80, 2.70 / 3.25, 3.06, 2.90, 2.77, 2.65, 2.55 2 x 47 x 225: 4.09, 3.85, 3.66, 3.49, 3.36, 3.24 / 3.85, 3.62, 3.44, 3.28, 3.15, 3.03 / 3.66, 3.44, 3.26, 3.11, 2.98, 2.87 2 x 47 x 250: 4.54, 4.27, 4.06, 3.88, 3.72, 3.59 / 4.27, 4.02, 3.81, 3.64, 3.50, 3.37 / 4.06, 3.81, 3.61, 3.45, 3.31, 3.19 2 x 47 x 275: 4.98, 4.69, 4.46, 4.26, 4.09, 3.95 / 4.69, 4.41, 4.19, 4.00, 3.84, 3.70 / 4.46, 4.19, 3.97, 3.79, 3.64, 3.50 2 x 47 x 300: 5.43, 5.11, 4.86, 4.64, 4.46, 4.30 / 5.11, 4.81, 4.56, 4.36, 4.19, 4.03 / 4.85, 4.56, 4.33, 4.13, 3.97, 3.82