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Watco Firm-Step® Heavy Duty GRP Step Covers

Ultra-tough GRP step covers for heavily trafficked steps

  • Extremely low slip potential
  • 10 year guarantee against breakage
  • Outstanding wear resistance
  • Free cut to size service
Delivery options
Next day delivery slots available upon request. Call us on 01483 418418 for details.
Frequently bought together


For interior and exterior use, Firm-Step® Heavy Duty GRP Step Covers have a unique ceramic grit surface which offers outstanding wear resistance. Convenient and versatile, they protect against corrosion and guarantee grip where it matters most. Firm-Step® Heavy Duty GRP Step Covers combine Glass Reinforced Plastic (GRP) tread and 55mm high visibility nosing to meet DDA and building regulations. Available in fine or coarse grade*, our step covers come in six tread colour combinations.

Recommended areas of use

  • Ramps, walkways, fire escapes, all staircases, mezzanine floors, train track crossings, areas of heavy foot traffic
  • Internal ramps and staircases


  • Watco Firm-Step® Heavy Duty GRP Step Covers come with a 10 year guarantee against breakage
  • Extremely low slip potential, even when wet (Wet PTV 70)
  • Available in a range of standard sizes. Also available in any size up to 3000mm x 345mm with our free cut to size service
  • Screws, fixing plugs and a free pre-drilling service are also available
Pendulum Slip Test Values
Top SurfaceDry PTVWet PTV
Coarse Grit76 Extremely low slip potential 70 Extremely low slip potential 
Fine Grit71 Extremely low slip potential 63 Extremely low slip potential 


Properties Resin bonded ceramic grit surface, superior durability
Suitable for Heavy traffic environments, staircases. Suitable substrates: wood, concrete, stone and metal
Interior or Exterior Exterior, Interior
Primer required Recommended


Surface preparation

Any damage or undulations to the substrate should be remedied to ensure that the stair tread will be on a reasonably flat and even surface. If using an adhesive, the substrate must be clean and dry and free from oils, grease, dust and any loose particles. The underside of the stair tread must also be clean and dry. Where the substrate is contaminated (e.g. by oil), mechanical fixing is essential. Prior to applying any adhesive, it is advisable to carry out a dry-fit first to ensure a suitable fit.

We recommend screw fixing to most substrates, combined with Watco Adhesive Mastic to prevent rocking on uneven surfaces.


Watco UltraBond Tape is suitable for bonding to concrete, wood, metal and steel in conjunction with Watco Tape Primer for unsealed, porous concrete, brick, stone, blockwork etc. Watco Adhesive Mastic is also a sealant and can be used to seal around the edges and stop water lying between the stair cover and the substrate. Water will not affect the stair covers but can affect the substrate such as wood or metal causing rot or rust. Watco Adhesive Mastic also offers a secondary fixing in the unlikely event that a mechanical fixing fails.

Run a bead of adhesive around the perimeter of the stair tread approximately 25mm in from the edges and then cross hatch at about 200mm apart. Apply sufficient hand pressure to bed the stair cover into position. With Watco Adhesive Mastic, optimum bonding will be obtained after 24 hours (at 20°C). However, stairs can be made available to traffic a few hours after bonding, but this is subject to temperature so it is worth testing first.

One 310ml tube of Watco Adhesive Mastic is sufficient for any one of the following:

  • 5 x 600mm wide step covers
  • 3 x 1000mm wide step covers
  • 2 x 1500mm wide step covers
  • 2 x 1200mm wide step covers

Firm-Step® Heavy Duty GRP Step Covers can be drilled and secured with stainless steel screws. Follow the preparation procedure prior to fixing:

  • Always ensure that the screw length is slightly longer than the plug length to obtain a good Fixing
  • Use Watco Adhesive Mastic on the underside to prevent the GRP drumming and rocking on the substrate
  • Fixing is generally recommended at approximately 70mm from the front, 50mm from each side, 60mm from the back, at a maximum of 250mm apart
  • If fitting to a metal substrate, use self-tapping screws. There is no need to counter sink the screw holes since the screw can be tightened so that it beds into the gritted surface, making it flush with the wearing surface


Installation Guide
Test results

Test results

Pendulum Slip Test Values

Coarse Grit: 

  • Dry PTV - 76 Extremely low slip potential 
  • Wet PTV - 70 Extremely low slip potential 

Fine Grit: 

  • Dry PTV - 71 Extremely low slip potential 
  • Wet PTV - 63 Extremely low slip potential 
Data sheets

Data sheets

Technical data sheets

Technical Data Sheet
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£34.15 (Ex VAT)

In stock

Delivery options
Next day delivery slots available upon request. Call us on 01483 418418 for details.

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Watco Firm-Step® Heavy Duty GRP Step Covers

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