Maximum Span Tables

BS4592 part 1, states three categories of load:

i) 3 kN/m2 - Light Duty, access limited to one person.
ii) 5 kN/m2 - General Duty, regular pedestrian traffic.
iii) 7.5 kN/m2 - Heavy Duty, high density pedestrian traffic.

The values have been calculated with deflections limited to 1/200th of the span or 10mm whichever is the lesser.

Some sections and types are subject to a minimum order quantity.

If you have any further questions, please contact our sales team for assistance.


These values on each of the following tables are in mm and represent the maximun unsupported span of gratings to achieve load shown.

15mm Pitch

  Load UDL

Load Bar

3kN/m2

5kN/m2

7.5kN/m2

  Clear Span (mm)

40x3

2765

2434

2199

30x3

2229

1949

1703

30x2

2014

1703

1487

25x3

1926

1624

1419

25x2

1682

1419

1239

20x3

1826

1540

1346

20x2

1540

1299

1135

21mm Pitch

  Load UDL

Load Bar

3kN/m2

5kN/m2

7.5kN/m2

  Clear Span (mm)

40x3

2548

2242

2026

30x3

2053

1747

1526

30x2

1810

1526

1333

25x3

1726

1456

1272

25x2

1508

1272

1111

25mm Pitch

  Load UDL

Load Bar

3kN/m2

5kN/m2

7.5kN/m2

  Clear Span (mm)

70x4

3753

3303

2985

60x4

3516

3094

2796

50x4

3273

2881

2603

40x4

2769

2437

2202

40x3

2437

2145

1918

30x3

1952

1646

1438

30x2

1705

1438

1256

25x3

1627

1372

1199

25x2

1421

1199

1047

30mm Pitch

  Load UDL

Load Bar

3kN/m2

5kN/m2

7.5kN/m2

  Clear Span (mm)

60x5

3581

3152

2848

50x5

3124

2749

2484

40x5

2642

2325

2101

40x3

2325

2047

1802

35x5

2390

2104

1869

35x3

2104

1805

1577

30x5

2129

1834

1602

30x3

1834

1547

1351

25x5

1812

1528

1335

25x3

1528

1289

1126

20x3

1223

1031

901

34mm Pitch

  Load UDL

Load Bar

3kN/m2

5kN/m2

7.5kN/m2

  Clear Span (mm)

60x5

3471

3055

2760

50x5

3027

2664

2408

40x5

2561

2254

2037

40x3

2254

1978

1728

35x5

2317

2039

1793

35x3

2039

1731

1512

30x5

2064

1759

1537

30x3

1759

1484

1296

25x5

1738

1466

1281

25x3

1466

1236

1080

20x3

1173

989

864

41mm Pitch

  Load UDL

Load Bar

3kN/m2

5kN/m2

7.5kN/m2

  Clear Span (mm)

60x5

3316

2919

2637

50x5

2893

2546

2300

40x5

2447

2153

1928

40x3

2153

1862

1626

35x5

2214

1931

1687

35x3

1931

1629

1423

30x5

1963

1655

1446

30x3

1655

1396

1220

25x5

1636

1379

1205

25x3

1379

1163

1016

20x3

1104

931

813


back to products