Approved Document K - Protection from falling, collision and impact defines the ‘nosing’ of stairs as ‘the leading edge of a stair tread’.
[Image: The elements of stairs]
For buildings other than dwellings, step nosings should be made visually apparent by using a contrasting material on both the tread and the riser a minimum of 55mm wide. If possible, step nosings that protrude over the tread below should be avoided. If the nosing does protrude, it should be by no more than 25mm
[Image: Examples of suitable tread profiles]
For common access areas in buildings that contain flats step nosings should be visually apparent, using a material that contrasts visually, 50mm to 65mm wide on the tread and 30mm to 55mm on the riser. A suitable tread nosing profile, should be used.
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