GRP Guides

Stair Safety Buying Guide

Use this guide to compare GRP stair treads, nosings, step covers and related stair-safety products for industrial, commercial and exposed access routes.

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Choose by stair requirement

New or replacement treads

GRP stair treads and GRP grating stair treads suit stair flights and industrial access routes.

Step-edge visibility

GRP stair nosings help define step edges and improve grip on existing stairs.

Worn step surfaces

Anti-slip step covers upgrade existing steps where the structure is sound but grip is poor.

Key details before buying

  • Measure tread width, going, nosing size and number of steps.
  • Check whether the stair needs full treads, nosings, covers or replacement parts.
  • Consider visibility, colour, drainage, surface exposure and fixing method.
  • Include photos where existing stairs need retrofit products.

Open mesh, solid top or covers?

Open-mesh stair treads suit drainage and exposed access. Solid-top stair treads provide a covered tread surface. Covers and nosings are often the retrofit route for existing stairs.

For trade or site support, send the dimensions and photographs before ordering.

Useful details to send

  • Stair width, step depth and quantity.
  • Existing material and condition.
  • Indoor, outdoor, wet or corrosive exposure.
  • Photos, drawing or required colour/visibility.

Need help choosing stair safety products?

Send the stair measurements, photos or drawing and GRP Express can help identify a practical product route.

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Technical specification checkpoint

From product choice to a defensible stair specification

Choose between a nosing, full cover and structural tread only after the hazard, geometry, support, loading, users and applicable design framework are known.

NosingUse for local edge grip and contrast where the existing tread surface and structure remain suitable.
Full coverUse where most of a sound tread needs a new high-friction surface and leading-edge treatment.
Structural treadUse where the product carries load between stringers or supports; confirm span, bearing, load and deflection.
Complete stairCoordinate rise, going, landings, handrails, guarding, lighting, drainage and evacuation—not merely the tread.
Specification areaWhat to establishEngineering boundary
Private building stairApproved Document K: 150–220 mm rise; 220–300 mm going; maximum 42° pitch.Not a precedent for public, workplace or rail access.
Utility stairApproved Document K: 150–190 mm rise; 250–400 mm going.Confirm whether machinery-access or sector requirements govern instead.
General-access stairApproved Document K: 150–170 mm rise; 250–400 mm going.Public and unfamiliar users may require higher inclusive-design provision.
Rail passenger stairNetwork Rail guidance: 150–170 mm rise; 280–425 mm going, with at least 300 mm preferred where practicable.Do not transfer station figures automatically to lineside or machinery access.

Important: The normal Approved Document K relationship is 2R + G = 550–700 mm. Consistency through the flight remains essential.

Primary references: HSE GEIS2; Approved Document K; and the relevant current project, accessibility and asset-owner requirements.