NBS Source
AntiVertigo Floor Grating


Floor grating for elevated flooring, complies with BS 4592-0 for people evacuation and has been specifically designed for elevated flooring and fire escapes as a non-transparent grating for public safety and reassurance.

The principal characteristic of the grating is that the bearing bar is shaped so that transparency is obstructed from any viewing angle. While providing a total visual screen, the grating retains a similar open area between the bars to a conventional grating for ventilation and drainage.

Flooring panels are manufactured to a modular format so that they can be combined through a neat interlocking of the framing bar to create a continuous surface. A standard landing or platform is composed of several intermediate panels and an end panel with an anti-slip nosing extension. Non-standard infill panels are made to custom sizes. Supplied in a hot-dip galvanized finish.

Features and benefits:

  • Transparency: 100% visual screening from any angle of observation.
  • Heel-proof: 12 mm space between the bearing bars.
  • Anti-ice: Virtually no surface where ice can form or be retained.
  • Anti-slip: In compliance with DIN 51130 (06/2004) - R10 class.
  • Weight: 16.2 kg/m2
  • Also available as stair treads with an integrated nosing or as flooring planks for landings or walkways - consult manufacturer for details.

General information


Insert requirements.


Hot dip galvanized to BS EN ISO 1461


Electrofused steel S235JR

Uniclass 2015

Pr_25_30_30_18 Carbon steel open bar metal gratingsPrimary


L30/20 Stairs

L30/250 Metal stairs

L30/30 Proprietary stairs

L30/310 Proprietary

L30/45 Ramps/ Walkways

L30/460 Walkways

L30/470 Ramps

Product range


Specification data - Carbon steel open bar metal gratings

Product Reference

AntiVertigo Floor Grating


End flooring panel

320 x 1200 mm.

Infill flooring panel

Bespoke, available in widths up to 2000 mm but will require additional support above 1500 mm.

Intermediate flooring panel

286 x 1200 mm.


Insert requirements.


34 x 4 mm flat bar

Standard, for laying on a steel section support.

60 x 4 mm flat bar

For side bolting.

Standard product features


Electrofused steel S235JR.


Hot dip galvanized to BS EN ISO 1461.


  • Profiled bearing bars: 1.8 mm thick.
  • Single round transverse bar: 6 mm diameter.


Alternative methods for clamping the floor panels depend upon accessibility:

  • Fixing clips where there is access from below.
  • Socket-cap screws for top fixing.

Product Options

Secondary steelwork:

Secondary support steelwork is designed and supplied as required.


Open Mesh Floor Grating

Open Mesh Floor Grating