Tempo:
Table 16 Maximum spans for built-up floor beams supporting not more than two floors1, 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, m5, 6 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 2.22 7–3 1.99 6–6 1.81 5–11 1.68 5–6 1.57 5–1 1.48 4–10 1.40 4–7 2.33 7–7 2.08 6–9 1.90 6–2 1.76 5–9 1.65 5–4 1.55 5–1 1.44 4–8 2.41 7–10 2.16 7–0 1.97 6–5 1.82 5–11 1.71 5–7 1.61 5–3 1.53 5–0
2.56 8–4 2.29 7–6 2.09 6–10 1.94 6–4 1.81 5–11 1.71 5–7 1.62 5–3 2.69 8–9 2.41 7–10 2.20 7–2 2.03 6–7 1.90 6–2 1.79 5–10 1.70 5–6 2.79 9–1 2.49 8–1 2.27 7–5 2.11 6–10 1.97 6–5 1.86 6–1 1.76 5–9
2.87 9–4 2.56 8–4 2.34 7–7 2.17 7–1 2.03 6–7 1.91 6–3 1.81 5–11 3.01 9–9 2.69 8–9 2.45 8–0 2.27 7–5 2.13 6–11 2.00 6–6 1.90 6–2 3.03 9–11 2.79 9–1 2.54 8–3 2.35 7–8 2.20 7–2 2.08 6–9 1.97 6–5
2.72 8–10 2.43 7–11 2.22 7–3 2.05 6–8 1.92 6–3 1.81 5–11 1.72 5–7 2.85 9–3 2.55 8–3 2.33 7–7 2.15 7–0 2.01 6–7 1.86 6–0 1.72 5–7 2.95 9–7 2.64 8–7 2.41 7–10 2.23 7–3 2.09 6–9 1.97 6–5 1.86 6–0
3.14 10–2 2.80 9–2 2.56 8–4 2.37 7–9 2.22 7–3 2.09 6–10 1.98 6–5 3.29 10–8 2.94 9–7 2.68 8–9 2.49 8–1 2.33 7–7 2.19 7–2 2.08 6–9 3.41 11–1 3.05 9–11 2.78 9–1 2.57 8–5 2.41 7–10 2.27 7–5 2.15 7–0
3.51 11–5 3.14 10–2 2.86 9–4 2.65 8–7 2.48 8–1 2.34 7–7 2.22 7–3 3.68 12–0 3.29 10–8 3.00 9–9 2.78 9–1 2.60 8–6 2.45 8–0 2.33 7–7 3.81 12–5 3.41 11–1 3.11 10–1 2.88 9–4 2.69 8–9 2.54 8–3 2.41 7–10
3.15 10–3 2.82 9–2 2.57 8–4 2.38 7–9 2.23 7–3 2.10 6–10 1.99 6–6 3.30 10–9 2.96 9–7 2.70 8–9 2.50 8–2 2.30 7–6 2.11 6–10 1.96 6–4 3.42 11–2 3.06 10–0 2.79 9–1 2.59 8–5 2.42 7–11 2.28 7–5 2.11 6–10
3.64 11–10 3.25 10–7 2.97 9–8 2.75 8–11 2.57 8–4 2.43 7–11 2.30 7–6 3.82 12–5 3.41 11–1 3.12 10–2 2.88 9–5 2.70 8–9 2.54 8–3 2.41 7–10 3.95 12–10 3.53 11–6 3.23 10–6 2.99 9–9 2.79 9–1 2.63 8–7 2.50 8–2
4.07 13–3 3.64 11–10 3.32 10–10 3.07 10–0 2.88 9–4 2.71 8–10 2.57 8–4 4.27 13–11 3.82 12–5 3.48 11–4 3.22 10–6 3.02 9–10 2.84 9–3 2.70 8–9 4.42 14–5 3.95 12–10 3.61 10–9 3.34 10–10 3.12 10–2 2.95 9–7 2.79 9–1
Continued on p. 279
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, m5, 6 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 2.22 7–3 1.99 6–6 1.81 5–11 1.68 5–6 1.57 5–1 1.48 4–10 1.40 4–7 2.33 7–7 2.08 6–9 1.90 6–2 1.76 5–9 1.65 5–4 1.55 5–1 1.44 4–8 2.41 7–10 2.16 7–0 1.97 6–5 1.82 5–11 1.71 5–7 1.61 5–3 1.53 5–0
2.56 8–4 2.29 7–6 2.09 6–10 1.94 6–4 1.81 5–11 1.71 5–7 1.62 5–3 2.69 8–9 2.41 7–10 2.20 7–2 2.03 6–7 1.90 6–2 1.79 5–10 1.70 5–6 2.79 9–1 2.49 8–1 2.27 7–5 2.11 6–10 1.97 6–5 1.86 6–1 1.76 5–9
2.87 9–4 2.56 8–4 2.34 7–7 2.17 7–1 2.03 6–7 1.91 6–3 1.81 5–11 3.01 9–9 2.69 8–9 2.45 8–0 2.27 7–5 2.13 6–11 2.00 6–6 1.90 6–2 3.03 9–11 2.79 9–1 2.54 8–3 2.35 7–8 2.20 7–2 2.08 6–9 1.97 6–5
2.72 8–10 2.43 7–11 2.22 7–3 2.05 6–8 1.92 6–3 1.81 5–11 1.72 5–7 2.85 9–3 2.55 8–3 2.33 7–7 2.15 7–0 2.01 6–7 1.86 6–0 1.72 5–7 2.95 9–7 2.64 8–7 2.41 7–10 2.23 7–3 2.09 6–9 1.97 6–5 1.86 6–0
3.14 10–2 2.80 9–2 2.56 8–4 2.37 7–9 2.22 7–3 2.09 6–10 1.98 6–5 3.29 10–8 2.94 9–7 2.68 8–9 2.49 8–1 2.33 7–7 2.19 7–2 2.08 6–9 3.41 11–1 3.05 9–11 2.78 9–1 2.57 8–5 2.41 7–10 2.27 7–5 2.15 7–0
3.51 11–5 3.14 10–2 2.86 9–4 2.65 8–7 2.48 8–1 2.34 7–7 2.22 7–3 3.68 12–0 3.29 10–8 3.00 9–9 2.78 9–1 2.60 8–6 2.45 8–0 2.33 7–7 3.81 12–5 3.41 11–1 3.11 10–1 2.88 9–4 2.69 8–9 2.54 8–3 2.41 7–10
3.15 10–3 2.82 9–2 2.57 8–4 2.38 7–9 2.23 7–3 2.10 6–10 1.99 6–6 3.30 10–9 2.96 9–7 2.70 8–9 2.50 8–2 2.30 7–6 2.11 6–10 1.96 6–4 3.42 11–2 3.06 10–0 2.79 9–1 2.59 8–5 2.42 7–11 2.28 7–5 2.11 6–10
3.64 11–10 3.25 10–7 2.97 9–8 2.75 8–11 2.57 8–4 2.43 7–11 2.30 7–6 3.82 12–5 3.41 11–1 3.12 10–2 2.88 9–5 2.70 8–9 2.54 8–3 2.41 7–10 3.95 12–10 3.53 11–6 3.23 10–6 2.99 9–9 2.79 9–1 2.63 8–7 2.50 8–2
4.07 13–3 3.64 11–10 3.32 10–10 3.07 10–0 2.88 9–4 2.71 8–10 2.57 8–4 4.27 13–11 3.82 12–5 3.48 11–4 3.22 10–6 3.02 9–10 2.84 9–3 2.70 8–9 4.42 14–5 3.95 12–10 3.61 10–9 3.34 10–10 3.12 10–2 2.95 9–7 2.79 9–1
Continued on p. 279
©
2026
Lehal.net