K1 Stairs and ladders
Construction of steps
For buildings other than dwellings
For steps apply the following guidance.
a. Make step nosings apparent: use material that will contrast visually, a minimum of 55mm wide, on both the tread and the riser.
For common access areas in buildings that contain flats
Provide a stair with steps that comply with the following guidance.
a. Make step nosings apparent: use material that will contrast visually, 50mm to 65mm wide on the tread and 30mm to 55mm on the riser.
All Gradus stair 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 nosing can provide an ideal solution as the channel and insert colours can 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 edging such as step dimension and type and frequency of traffic. However, a large proportion of Gradus stair edging fall within the dimensions stated, including the XT range.
Source: Building Regulations – Protection from falling, collision, and impact – Approved Document K – 2013 Edition
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