Except where there is a fixed structure within 100 mm of the stairway stile, stairways and stairway landings shall be provided with guardrailing on any exposed side.
Every stairway shall have at least one handrail and a handrail on each side for stairway wider than 1000mm.(refer: to handrails and guardrails for details).
Treads shall have a minimum live loading of 2.5 kPa, or a 2.2 kN per linear metre or minimum point loading of 1.5 kN applied on 100mm ×100 mm pad on each step, whichever loading produces the more adverse effect.
The maximum deflection shall be L/100 or 40mm, whichever is the lesser, over the horizontal span (L) of the stairway between supports.If the stairs are likely to be loaded in excess of the above requirements, refer to AS/NZS 1170.1.
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