Permissible tolerances
The maximum permissible deviations from work sizes of gratings shall be as shown in table.
| Location | Tolerance (mm) |
| Length of grating | +0 -5 |
| Width of grating | +0 -5 |
| Depth of loadbearing bar | |
| up to and including 25 mm | +1.0 -0.5 |
| over 25 mm up to 50 mm | +1.5 -0.75 |
| over 50 mm up to 100 mm | +2.0 -1.0 |
| over 100 mm up to 150 mm | +2.0 -1.5 |
| Thickness of loadbearing bar | |
| up to 10 mm | ± 0.4 |
| over 10mm up to 15 mm | ± 0.5 |
Where the function of binding bars excludes load transfer, they shall be secured to the nearest loadbearing bar at every 127 mm pitch.
Where the binding bars are loadbearing, they shall be secured to every load bearing bar. If welded the fillet weld leg length shall at least be equivalent to the thickness of the loadbearing bar, throughout the depth of the binding bar and one side of the loadbearing bar