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Last edited 14 Sep 2018
Individual steps are made up of a horizontal tread and a vertical riser. They are measured in terms of a ‘going’, i.e. the depth from front-to-back of the step (less any overlap with the next step above), a rise (the vertical distance between treads, and the width from one side to the other.
Steps should have level treads with the rise and going of each step consistent throughout the flight. The part of the tread that sometimes overhangs the riser is called the ‘nosing’. Depending on the design, the riser can be left open, or can be closed.
- Approved document K: Protection from falling, collision and impact.
- Approved document M: Access to and use of buildings (only when external stepped access also forms part of the principal entrances and alternative accessible entrances and when they form part of the access route to the building from the boundary of the site and car parking).
- Approved document B: Fire safety.
For more information, see Stair design.
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