Anti-Slip Stair Nosing 55 x 55mm GRP Medium Grit

Worn, chipped or slippery step edges are the most common cause of falls on a staircase, and taking a flight out of service to rebuild it is rarely an option in a working building. This GRP stair nosing is the retrofit answer: a 55mm x 55mm angle that caps the existing step edge in one piece, adding a hard, mineral-gritted wearing surface and a clearly defined leading edge without touching the structure underneath. It goes straight over timber, steel, concrete, stone and tiled steps in offices, schools, plant rooms, loading bays and public entrances. Five stock lengths from 800mm to 3m and nine colours let you cover the full width of the tread and set whatever visual contrast the site needs. For flights fully exposed to the weather, the same profile is covered on our outdoor GRP stair nosing page.

Why it works

A gritted surface that wears rather than polishes

GRP – glass reinforced plastic – is a fibreglass laminate, and on this profile the anti-slip grit is bonded into the resin rather than stuck on as a tape or a coating. That distinction matters on a stair. A self-adhesive abrasive strip fails in two ways: the adhesive lifts at the edges, and the abrasive face rubs smooth. A gritted GRP nosing keeps working as it wears, because the grit runs through the surface instead of sitting on top of it. The medium grit grade is the general-purpose choice – coarse enough for work boots and wet treads, but not so aggressive that it snags hands, shopping bags or soft-soled shoes in a busy public stairwell.

A one-piece angle, not a patch

The section wraps the tread and the riser together, so the vulnerable front arris of the step is covered rather than filled. Crumbling concrete nosings and softened timber edges are held and protected underneath it, which is usually cheaper and far quicker than casting a repair. GRP does not rust, rot or corrode, so the repair does not become the next maintenance liability the way a steel or aluminium patch does on a stair that gets mopped, gritted or washed down.

Where it is used

Internal staircases in offices, schools, hospitals and public buildings; steel access stairs on plant, gantries and mezzanines; timber steps in leisure centres, workshops and back-of-house routes; commercial kitchens and cold stores where footwear arrives wet; and retail, transport and residential common stairs where the concrete nose has worn round. It works equally well outside – the weather-exposed case is covered on the outdoor page linked above.

Specifications

Choosing the right length and colour

Measure the full width of the tread and buy the next length up. GRP cuts cleanly with an angle grinder or a fine-tooth blade, and it is far better to trim 60mm off a 1200mm nosing than to leave 40mm of unprotected edge at one end of the step. The 2m and 3m lengths are bought either for wide flights or to be cut down economically across several treads.

On colour, decide whether you are marking the step or matching it. Yellow, white and buff give the strongest contrast against grey concrete and are the usual choice where the stair has to read clearly for visually impaired users. Black, mid grey and brown recede into darker treads and timber, where the nosing is there to protect the edge rather than to announce it. Green, red and blue are normally specified for zoning – colour-coding routes, floor levels or plant areas so the stair matches the rest of the site marking.

Installation, use and care

Fit to a clean, dry and structurally sound edge. The usual method is a bed of high-strength construction adhesive along the underside of both legs, with mechanical fixings driven through the tread leg into concrete, timber or steel. Drill and countersink so screw heads finish below the grit line. In service, clean with a stiff brush and ordinary detergent: the grit holds dirt, so brushing does more than mopping. Avoid solvents and wire wool, which polish the wearing face.

Frequently asked questions

Will a 55mm x 55mm nosing suit my steps?

It suits any step with a reasonably square front edge and at least 55mm of usable tread and riser at the nose. On steps with a rounded or badly broken edge, pack and level the arris first, or the nosing will rock on the high points.

Can I cut it to length on site?

Yes. Cut GRP with an angle grinder or a fine-tooth blade, wearing eye and respiratory protection, and seal the cut end with resin or paint if it will be exposed to standing water.

What is the difference between medium, fine and coarse grit?

Grit grade is a trade-off between grip and comfort. Fine is used where people go barefoot or where a smoother surface is wanted underfoot; coarse is for heavy industrial traffic and severe contamination. Medium is the general-purpose commercial grade and covers most stairs, internal and external.

What slip resistance figure does it achieve?

The manufacturer does not publish a pendulum, PTV or R-value figure for this line, so we do not quote one. If your specification requires a tested figure, contact us and we will request the data from the manufacturer before you order.

Can I use the same profile on an outdoor flight?

Yes – it is the identical section, and GRP does not rust or rot. If the stair is fully weather-exposed, read the outdoor page linked at the top, which covers fixings, cut-end sealing and winter maintenance in more detail.

Ordering and delivery

All nine colours and five lengths are ordered from this page – choose the length first, then the colour. UK mainland delivery is charged at a single flat rate however many pieces you order, so it is worth ordering the whole flight at once. If you need a length or a colour that is not listed, contact us before ordering and we will check availability with the manufacturer.