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Table 18 Spans for steel floor beams Supported Joist Length, m (ft.), (half the sum of joist spans for both sides of the beam) Section
7 ft. 2.4 m 10 in.
3m
9 ft. 9 in.
11 ft. 3.6 m 9 in.
13 ft. 4.2 m 9 in.
15 ft. 17 ft. 4.8 m 8 in. 5.4 m 8 in.
19 ft. 6.0 m 11 in.
One storey supported W150 x 22
5.5
18-0
5.2
17-1
4.9
16-1
4.8
15-8
4.6
15-1
4.5
14-9
4.3
14-1
W200 x 21
6.5
21-3
6.2
20-3
5.9
19-5
5.7
18-8
5.4
17-8
5.1
16-8
4.9
16-1
W200 x 27
7.3
23-10
6.9
22-7
6.6
21-7
6.3
20-8
6.1
20-0
5.9
19-4
5.8
19-0
W200 x 31
7.8
25-7
7.4
24-3
7.1
23-3
6.8
22-3
6.6
21-7
6.4
21-0
6.2
20-3
W250 x 24
8.1
26-7
7.6
24-10
7.3
23-10
7.0
23-0
6.6
21-7
6.2
20-3
5.9
19-4
W250 x 33
9.2
30-2
8.7
28-6
8.3
27-2
8.0
26-2
7.7
25-3
7.5
24-7
7.3
23-10
W250 x 39
10.0
32-9
9.4
30-9
9.0
29-6
8.6
28-2
8.4
27-7
8.1
26-7
7.9
25-10
W310 x 31
10.4
34-1
9.8
32-1
9.4
30-9
8.9
29-2
8.4
27-7
8.0
26-2
7.6
24-10
W310 x 39
11.4
37-4
10.7 35-1
10.0 32-9
9.8
32-1
9.5
31-2
9.2
30-2
9.0
29-6
Two storeys supported W150 x 22
4.9
16-1
4.4
14-3
4.1
13-3
3.8
12-6
3.5
12-6
3.4
11-2
3.2
10-6
W200 x 21
5.6
18-4
5.1
16-8
4.6
15-1
4.3
14-1
4.1
13-4
3.8
12-6
3.7
12-1
W200 x 27
6.4
21-0
6.1
20-0
5.6
18-4
5.3
17-4
4.9
16-1
4.7
15-4
4.4
14-4
W200 x 31
6.9
22-7
6.5
21-3
6.2
20-3
5.8
19-0
5.4
17-8
5.1
16-8
4.9
16-1
W250 x 24
6.8
22-3
6.1
20-0
5.6
18-4
5.2
17-1
4.9
16-1
4.6
15-1
4.4
14-4
W250 x 33
8.2
26-10
7.7
25-3
7.0
23-0
6.5
21-3
6.1
20-0
5.8
19-0
5.5
18-0
W250 x 39
8.8
28-10
8.3
27-2
7.8
25-7
7.2
23-7
6.8
22-3
6.4
21-0
6.1
20-0
W310 x 31
8.7
28-6
7.8
25-7
7.2
23-7
6.7
22-0
6.2
20-3
5.9
19-4
5.6
18-4
W310 x 39
10.0
32-9
9.3
30-6
8.5
27-10
7.9
25-10
7.4
24-3
7.0
23-0
6.7
22-0
Note to Table 18 1. The section information provides the beam depth and weight in metric units. For example, a W150 x 22 beam is 150 mm (6 in.) deep and weighs 22 kg. per metre (14.8 lbs. per foot)