Guidance on Stair Nosings
10 vertical movement
10.1 steps and stairs
10.1.4 Identification and slip resistance of nosings
Each step nosing should incorporate a durable, permanently contrasting continuous material for the full width of the stair on both the tread and the riser to help people who are blind or partially sighted appreciate the extent of the stair and identify individual treads . The contrasting material should extend 50 mm to 65 mm in width from the front edge of the tread and 30 mm to 55 mm from the top of the riser, and should contrast visually with the remainder of the tread and riser .
NOTE 1 A particular care is needed to ensure that there is adequate contrast between nosing and landings .
NOTE 2 Nosing that wraps around the riser might assist people who are blinder partially sighted .
NOTE 3 A proprietary nosing can provide a durable solution that satisfies both visual contrast and slip resistance criteria.
The whole tread or the nosing should incorporate a slip-resistant material.
Surface material tread and risers should be free from patterning.
NOTE 4 It is beneficial that surface material at landings and floors contrasts with surface material of stairs, subject to maintaining visual contrast at top and bottom nosing.
 All Gradus star edging colours have been measured to provide Light Reflectance Values (LRVs)* in order to provide the specifier with information to ensure that suitable contrast is achieved with the surrounding stair material. PVC-u Hardnose stair edgings can provide an ideal solution as channel and insert colours an be matched to contrast with the tread and riser.
* These values have been determined using the CIE Y value, in accordance with BS 8493:2008+A1:2010.
 The profile dimensions stated are guidance only and other factors should be taken into consideration when specifying stair nosings such as step dimension and type and frequency of traffic. However, a large proportion of Gradus stair nosings fall between these dimensions stated, including the XT range.
 The XT range of stair nosings features a slip-resistant pvc insert that extends around the leading edge of the profile to ensure that foot contact is always made with the slip-resistant element of the stair nosing, providing the ideal solution for reducing the risk of slips, trips and falls on stairs in line with BRE. The XT range is available in aluminium and PVC-u Hardnose.
10 Vertical circulation
10.1 Internal steps and stairs
10.1.7 Surface finishes
The surface materials used for internal steps and stairs should be chosen to be easy to maintain and as slip-resistant as possible, especially if surfaces are likely to become wet due to location or use, or if spillage occurs.
NOTE 1 Advice and further references on slip resistance of surfaces is given in Annex C.
A choice of slip-resistant insert materials is available for all Gradus stair nosing. Xtra-grip and Xtra-grip Plus inserts have been specifically designed to reduce the risk of slip in internal wet areas or where spillages are likely to occur.
Annex C Slip potential characteristics of treads, ramp surfaces and floor finishes
C.2 Slip resistance
The following indices are used to indicate the slipperiness of surfaces:
a) pendulum test values (PTVs) obtained using a pendulum tester in line with BS 7976-2;
b) surface micro-roughness (Rz) measurements using a stylus instrument in accordance with BS 1134-1.
C.4 Step nosings
Where slip resistance is required for nosings and treads, the slip resistance needs to be the equivalent to that expected for level surfaces. A PTV greater than 36 is considered to be suitable, as pushing and turning are unlikely on stairs. On existing nosings, the slip resistance of step nosings are generally expressed by their Rz roughness value as PTV is difficult to measure. In such cases a roughness Rz value of 20 µm is recommended.
All Gradus stair nosing inserts are independently tested for slip-resistance by the Health & Safety Laboratory using the pendulum test – all inserts have a low slip potential (inserts measured in dry conditions – PTV of >36 inserts measured in wet conditions – PTV of >36). All inserts are also tested for wear, surface roughness, chemical resistance and bacterial/fungal resistance.
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