Emergency Staircase Width
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For other stairs a minimum width of 1 200 mm and 1 000 mm between handrails.
Emergency staircase width. It is measured. Width refers to the length of risers and treads from side to side. For code requirements the minimum staircase width is the horizontal dimension between the sidewalls of a staircase measured above the handrail s. For stairs that form part of a means of escape see fire below.
For a stairway with a railing on just one side stairway width can be a bit smaller with a clear width of 31 5 in the space below the handrail height. For indoor stairs the riser should be between 0 12 m and 0 18 m and the tread. 1910 25 b 5 when a door or a gate opens directly on a stairway a platform is provided and the swing of the door or gate does not reduce the platform s effective usable depth to. The minimum width of a stairway should be 0 90 m for one way traffic and 1 50 m for two way traffic.
Stairway landings and platforms are at least the width of the stair and at least 30 inches 76 cm in depth as measured in the direction of travel. Stairways serving an occupant load of less than 50 shall have a width of not less than 36 inches. This allows taking into account stair stringer trim such as shown in our photographs. If the stairs are more than 2 m wide then they should be divided into flights of no less than 1 000 mm.
See section 1009 3 for accessible means of egress stairways. Headroom is the vertical dimension from the stair treads to the ceiling directly above.
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