Oyn

Ernst Neufert, Bauentwurfslehre (loc cit)

Minimum width for three persons

On spiral stairs the distance from the line of going to the outside of the string should be 35-40 cm.

©On straight flights the distance from the line of going to the balustrade should be 55 cm.

Stairs on which two persons can pass without difficulty

Minimum width for three persons

Usable stair width measured between wall surface and inside edge of handrail or between handrails

Stairs must be fitted with a permanent handrail. Intermediate handrail required on stairs > 4 m wide. Spiral stairs: handrail on outside

Minimum dimensions for stairs

Stairs in private houses, within apartments, to roof spaces and basements in high-rise buildings

Narrower width for stairs used only occasionally

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