Maximum clear span for open bar steel flooring
When choosing the appropriate flooring for your application you will have to consider
the amount of traffic usage. The chart below shows the typical clear spans that will
give a deflection of less than 10mm or 1/200th of the span as defined in BS 4592 and
BS 5950 when subject to the uniformly distributed loads shown below.
For critical applications please contact us for the relevant technical sheet.

Access limited to one person
Load and
application

 Bearer
Bar

 Weight
Shown in kg/m2
 Maximum clear span
Shown in millimetres
Narrow
Standard
Square
Narrow
Standard
Square
3kN/m2

Access
limited
to one
person
20 x 3
-
15.0
-
-
1090
-
25 x 3
20.5
17.5
20.0
1675
1565
1600
25 x 5
33.4
28.5
33.0
2000
1707
1970
30 x 3
24.0
20.6
23.6
2069
1878
2000
30 x 5
39.5
33.6
38.8
2410
2049
2390
35 x 3
-
29.7
-
-
1900
-
35 x 5
-
39.0
-
-
2190
-
40 x 3
-
26.7
-
-
2504
-
40 x 5
-
43.6
-
-
2732
-
Two way pedestrian traffic
Load and
application

 Bearer
Bar

 Weight
Shown in kg/m2
 Maximum clear span
Shown in millimetres
Narrow
Standard
Square
Narrow
Standard
Square
5kN/m2

Two way
pedestrian
traffic
20 x 3
-
15.0
-
-
920
-
25 x 3
20.5
17.5
20.0
1335
1212
1305
25 x 5
33.4
28.5
33.0
1598
1322
1570
30 x 3
24.0
20.6
23.6
1602
1454
1580
30 x 5
39.5
33.6
38.8
1963
1587
1950
35 x 3
-
29.7
-
-
1600
-
35 x 5
-
39.0
-
-
1900
-
40 x 3
-
26.7
-
-
1939
-
40 x 5
-
43.6
-
-
2116
-
High density pedestrian traffic
Load and
application

 Bearer
Bar

 Weight
Shown in kg/m2
 Maximum clear span
Shown in millimetres
Narrow
Standard
Square
Narrow
Standard
Square
7.5kN/m2

High
density
pedestrian
traffic
20 x 3
-
15.0
-
-
800
-
25 x 3
20.5
17.5
20.0
1090
989
1054
25 x 5
33.4
28.5
33.0
1330
1080
1320
30 x 3
24.0
20.6
23.6
1308
1187
1295
30 x 5
39.5
33.6
38.8
1602
1296
1580
35 x 3
-
29.7
-
-
1400
-
35 x 5
-
39.0
-
-
1675
-
40 x 3
-
26.7
-
-
1582
-
40 x 5
-
43.6
-
-
1728
-
Clear span is the unsupported distance between the supporting steelwork.
Allow at least 30mm support on either side.
For galvanized weights add 8%.

Manufacturing standards
Luxtrade flooring is manufactured to BS 4592 Part 1 and by companies whose
Quality Assurance Systems are approved to ISO 9000.

Finishes available
Self colour
Mild steel galvanized to BS EN ISO 1461 of 1999; painted; or powder coated.
Aluminium anodised for a long lasting attractive finish.
Stainless steel mill finish for industrial applications, pickled and passivated
or electro-polished to mirror finish.