Tempo:
Table 15 Maximum spans for built-up floor beams supporting not more than one floor1, 2
Commercial Designation Douglas Fir – Larch
Grade No. 1 and No. 2
Hem – Fir
No. 1 and No. 2
Spruce – Pine – Fir
No. 1 and No. 2
Supported Length,5, 6 m ft. 2.4 8 3.0 10 3.6 12 4.2 14 4.8 16 5.4 18 6.0 20 2.4 8 3.0 10 3.6 12 4.2 14 4.8 16 5.4 18 6.0 20 2.4 8 3.0 10 3.6 12 4.2 14 4.8 16 5.4 18 6.0 20
Maximum Span, m (ft.–in.)3, 4 Size of Built-up Beam, mm (in.) 38 x 184 38 x 235 38 x 286 2x8 2 x 10 2 x 12 3-ply 4-ply 5-ply 3-ply 4-ply 5-ply 3-ply 4-ply 5-ply 2.97 9–8 2.65 8–8 2.42 7–11 2.24 7–4 2.10 6–10 1.98 6–5 1.88 6–1 3.11 10–1 2.78 9–1 2.54 8–3 2.35 7–8 2.20 7–2 2.07 6–9 1.97 6–5 3.07 10–0 2.85 9–4 2.63 8–7 2.44 7–11 2.28 7–5 2.15 7–0 2.04 6–8
3.42 11–2 3.06 10–0 2.80 9–1 2.59 8–5 2.42 7–11 2.28 7–5 2.17 7–1 3.55 11–7 3.21 10–5 2.93 9–7 2.72 8–10 2.54 8–3 2.39 7–10 2.27 7–5 3.38 11–0 3.14 10–3 2.95 9–8 2.80 9–2 2.63 8–7 2.48 8–1 2.35 7–8
3.82 12–6 3.42 11–2 3.13 10–2 2.89 9–5 2.71 8–10 2.55 8–4 2.42 7–11 3.82 12–6 3.55 11–7 3.28 10–8 3.04 9–11 2.84 9–3 2.68 8–9 2.54 8–3 3.64 11–11 3.38 11–0 3.18 10–5 3.02 9–10 2.89 9–5 2.77 9–0 2.63 8–7
3.63 11–10 3.24 10–7 2.96 9–8 2.74 8–11 2.56 8–4 2.42 7–10 2.29 7–6 3.80 12–5 3.40 11–1 3.11 10–1 2.88 9–4 2.69 8–9 2.54 8–3 2.41 7–10 3.92 12–10 3.52 11–6 3.22 10–6 2.98 9–8 2.79 9–1 2.63 8–7 2.49 8–1
4.19 13–8 3.75 12–2 3.42 11–2 3.17 10–4 2.96 9–8 2.79 9–1 2.65 8–7 4.39 14–4 3.93 12–9 3.59 11–8 3.32 10–10 3.11 10–1 2.93 9–6 2.78 9–0 4.32 14–1 4.01 13–1 3.71 12–1 3.44 11–2 3.22 10–6 3.03 9–10 2.88 9–4
4.68 15–3 4.19 13–8 3.82 12–5 3.54 11–6 3.31 10–9 3.12 10–2 2.96 9–8 4.88 15–11 4.39 14–4 4.01 13–1 3.71 12–1 3.47 11–4 3.27 10–8 3.11 10–1 4.65 15–2 4.32 14–1 4.06 13–3 3.84 12–6 3.60 11–8 3.39 11–0 3.22 10–6
4.21 13–8 3.76 12–3 3.44 11–2 3.18 10–4 2.98 9–8 2.81 9–2 2.66 8–8 4.41 14–4 3.95 12–10 3.60 11–9 3.34 10–10 3.12 10–2 2.94 9–7 2.79 9–1 4.57 14–11 4.09 13–4 3.73 12–2 3.46 11–3 3.23 10–6 3.05 9–11 2.89 9–5
4.86 15–10 4.35 14–2 3.97 12–11 3.67 11–11 3.44 11–2 3.24 10–7 3.07 10–0 5.10 16–07 4.56 14–10 4.16 13–7 3.85 12–6 3.60 11–9 3.40 11–1 3.22 10–6 5.25 17–2 4.72 15–4 4.31 14–0 3.99 13–0 3.73 12–2 3.52 11–5 3.34 10–10
5.43 17–8 4.86 15–10 4.44 14–5 4.11 13–4 3.84 12–6 3.62 11–9 3.44 11–2 5.70 18–7 5.10 16–7 4.65 15–2 4.31 14–0 4.03 13–1 3.80 12–4 3.60 11–9 5.59 18–3 5.25 17–2 4.82 15–8 4.46 14–6 4.17 13–7 3.93 12–10 3.73 12–2
Continued on p. 277
Commercial Designation Douglas Fir – Larch
Grade No. 1 and No. 2
Hem – Fir
No. 1 and No. 2
Spruce – Pine – Fir
No. 1 and No. 2
Supported Length,5, 6 m ft. 2.4 8 3.0 10 3.6 12 4.2 14 4.8 16 5.4 18 6.0 20 2.4 8 3.0 10 3.6 12 4.2 14 4.8 16 5.4 18 6.0 20 2.4 8 3.0 10 3.6 12 4.2 14 4.8 16 5.4 18 6.0 20
Maximum Span, m (ft.–in.)3, 4 Size of Built-up Beam, mm (in.) 38 x 184 38 x 235 38 x 286 2x8 2 x 10 2 x 12 3-ply 4-ply 5-ply 3-ply 4-ply 5-ply 3-ply 4-ply 5-ply 2.97 9–8 2.65 8–8 2.42 7–11 2.24 7–4 2.10 6–10 1.98 6–5 1.88 6–1 3.11 10–1 2.78 9–1 2.54 8–3 2.35 7–8 2.20 7–2 2.07 6–9 1.97 6–5 3.07 10–0 2.85 9–4 2.63 8–7 2.44 7–11 2.28 7–5 2.15 7–0 2.04 6–8
3.42 11–2 3.06 10–0 2.80 9–1 2.59 8–5 2.42 7–11 2.28 7–5 2.17 7–1 3.55 11–7 3.21 10–5 2.93 9–7 2.72 8–10 2.54 8–3 2.39 7–10 2.27 7–5 3.38 11–0 3.14 10–3 2.95 9–8 2.80 9–2 2.63 8–7 2.48 8–1 2.35 7–8
3.82 12–6 3.42 11–2 3.13 10–2 2.89 9–5 2.71 8–10 2.55 8–4 2.42 7–11 3.82 12–6 3.55 11–7 3.28 10–8 3.04 9–11 2.84 9–3 2.68 8–9 2.54 8–3 3.64 11–11 3.38 11–0 3.18 10–5 3.02 9–10 2.89 9–5 2.77 9–0 2.63 8–7
3.63 11–10 3.24 10–7 2.96 9–8 2.74 8–11 2.56 8–4 2.42 7–10 2.29 7–6 3.80 12–5 3.40 11–1 3.11 10–1 2.88 9–4 2.69 8–9 2.54 8–3 2.41 7–10 3.92 12–10 3.52 11–6 3.22 10–6 2.98 9–8 2.79 9–1 2.63 8–7 2.49 8–1
4.19 13–8 3.75 12–2 3.42 11–2 3.17 10–4 2.96 9–8 2.79 9–1 2.65 8–7 4.39 14–4 3.93 12–9 3.59 11–8 3.32 10–10 3.11 10–1 2.93 9–6 2.78 9–0 4.32 14–1 4.01 13–1 3.71 12–1 3.44 11–2 3.22 10–6 3.03 9–10 2.88 9–4
4.68 15–3 4.19 13–8 3.82 12–5 3.54 11–6 3.31 10–9 3.12 10–2 2.96 9–8 4.88 15–11 4.39 14–4 4.01 13–1 3.71 12–1 3.47 11–4 3.27 10–8 3.11 10–1 4.65 15–2 4.32 14–1 4.06 13–3 3.84 12–6 3.60 11–8 3.39 11–0 3.22 10–6
4.21 13–8 3.76 12–3 3.44 11–2 3.18 10–4 2.98 9–8 2.81 9–2 2.66 8–8 4.41 14–4 3.95 12–10 3.60 11–9 3.34 10–10 3.12 10–2 2.94 9–7 2.79 9–1 4.57 14–11 4.09 13–4 3.73 12–2 3.46 11–3 3.23 10–6 3.05 9–11 2.89 9–5
4.86 15–10 4.35 14–2 3.97 12–11 3.67 11–11 3.44 11–2 3.24 10–7 3.07 10–0 5.10 16–07 4.56 14–10 4.16 13–7 3.85 12–6 3.60 11–9 3.40 11–1 3.22 10–6 5.25 17–2 4.72 15–4 4.31 14–0 3.99 13–0 3.73 12–2 3.52 11–5 3.34 10–10
5.43 17–8 4.86 15–10 4.44 14–5 4.11 13–4 3.84 12–6 3.62 11–9 3.44 11–2 5.70 18–7 5.10 16–7 4.65 15–2 4.31 14–0 4.03 13–1 3.80 12–4 3.60 11–9 5.59 18–3 5.25 17–2 4.82 15–8 4.46 14–6 4.17 13–7 3.93 12–10 3.73 12–2
Continued on p. 277
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