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Lessons / Stairs, landings and handrails
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Tapered treads and spirals
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Tapered treads that narrow to a point at the centre.
Every number here is a working estimate. Check it with your building authority.Turn JavaScript on to work the lesson. The drawing shows how it starts.
The rule this lesson teaches
Tapered treads need at least 150 mm (6 in) at the narrow end and a uniform 255 mm (10 in) to 355 mm (14 in) at 300 mm (12 in) in from the handrail.