Maximum clear span of flat roof joists for access only

Table 4B.36 Maximum clear span of flat roof joists (m); Access only for cleaning and maintenance; Imposed load 0.75 kN/m²; Timber strength class C24 C24 Dead Load [kN/m²] excluding the self weight of the joist Size of joist (mm) | 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 Spacing of joist (mm) | 400 450 600 | 400 450 600 | 400 450 600 38 x 97 | 1.84 1.82 1.76 | 1.76 1.73 1.66 | 1.69 1.66 1.59 38 x 120 | 2.50 2.46 2.37 | 2.37 2.33 2.22 | 2.27 2.22 2.11 38 x 145 | 3.18 3.13 3.00 | 3.00 2.94 2.79 | 2.85 2.79 2.64 38 x 170 | 3.81 3.75 3.50 | 3.58 3.51 3.30 | 3.40 3.32 3.12 38 x 195 | 4.51 4.40 4.01 | 4.22 4.13 3.78 | 3.99 3.90 3.59 38 x 220 | 5.13 4.95 4.51 | 4.85 4.67 4.25 | 4.59 4.44 4.04 47 x 97 | 2.03 2.00 1.94 | 1.94 1.91 1.83 | 1.86 1.83 1.74 47 x 120 | 2.74 2.70 2.60 | 2.60 2.55 2.43 | 2.48 2.43 2.30 47 x 145 | 3.47 3.42 3.26 | 3.27 3.21 3.04 | 3.11 3.04 2.87 47 x 170 | 4.15 4.08 3.76 | 3.89 3.81 3.54 | 3.69 3.61 3.36 47 x 195 | 4.88 4.70 4.29 | 4.58 4.44 4.05 | 4.33 4.22 3.85 47 x 220 | 5.48 5.29 4.83 | 5.18 5.00 4.56 | 4.94 4.76 4.33 50 x 97 | 2.08 2.06 1.99 | 1.99 1.96 1.88 | 1.91 1.88 1.79 50 x 120 | 2.81 2.77 2.66 | 2.66 2.62 2.49 | 2.54 2.49 2.36 50 x 145 | 3.56 3.50 3.32 | 3.35 3.29 3.12 | 3.19 3.12 2.94 50 x 170 | 4.26 4.18 3.83 | 3.99 3.91 3.61 | 3.78 3.69 3.43 50 x 195 | 4.97 4.80 4.38 | 4.68 4.53 4.13 | 4.43 4.31 3.93 50 x 220 | 5.59 5.39 4.93 | 5.28 5.09 4.65 | 5.04 4.85 4.42 63 x 97 | 2.31 2.28 2.20 | 2.20 2.16 2.07 | 2.11 2.07 1.97 63 x 120 | 3.10 3.05 2.93 | 2.93 2.88 2.74 | 2.80 2.74 2.59 63 x 145 | 3.90 3.84 3.58 | 3.67 3.60 3.38 | 3.49 3.41 3.21 63 x 170 | 4.65 4.51 4.12 | 4.35 4.26 3.89 | 4.13 4.03 3.70 63 x 195 | 5.33 5.15 4.71 | 5.05 4.87 4.45 | 4.82 4.64 4.24 63 x 220 | 5.98 5.78 5.30 | 5.67 5.47 5.00 | 5.41 5.22 4.76 75 x 120 | 3.33 3.27 3.14 | 3.14 3.08 2.93 | 2.99 2.93 2.77 75 x 145 | 4.17 4.10 3.78 | 3.92 3.84 3.57 | 3.73 3.64 3.40 75 x 170 | 4.92 4.75 4.35 | 4.64 4.50 4.11 | 4.40 4.29 3.92 75 x 195 | 5.61 5.42 4.97 | 5.32 5.14 4.70 | 5.08 4.90 4.48 75 x 220 | 6.29 6.08 5.59 | 5.97 5.77 5.28 | 5.70 5.50 5.04 38 x 140 | 2.99 2.94 2.82 | 2.82 2.75 2.63 | 2.69 2.63 2.49 38 x 184 | 4.21 4.13 3.79 | 3.94 3.85 3.57 | 3.73 3.64 3.39 CLS/ALS