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On staircases that change direction, you are allowed to make each flight a different width if necessary.

 

Stair length

 

A flight of stairs can include up to 36 risers, or steps, in a straight line. After that, they should change direction by at least 30°. This is to interrupt falls and prevent anyone tumbling a long way down to the bottom of the stairs.

 

Landings

 

A landing can either be a flat platform where the stairs change direction, or part of the floor at the top or bottom of the staircase. For safety, the landing must be at least as wide and deep as the narrowest part of the stairs. All landings need to be completely level except

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