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Fixed Stairway Based on AS1657 & AS1428.1
To clearly represent differences between the two most common standards for design of access stairways a hypothetical stairway was investigated.
The differences between two standards are listed in table (1).
Table (1)- AS1657 and AS1428.1 Comparison
| Specification | AS1657 | AS1428.1 |
| When | Height More than 300mm | Access for people with disabilities |
| Width (Inside Edge of the Stiles) | Min. 600mm | Min. 1000mm |
| Top of the Handrail Height (from nosing of a stair) | 900-1100mm | 865-1000mm |
| Handrail Obstruction | Permitted | Not Permitted |
| Intermediate Rail | Required, with maximum gap of 450mm to guardrail and toe board | Not Required |
| Stair Risers Type | Open or Opaque | Shall be Opaque |
| Risers (R) and Goings (G) | Tread Depth (TD) 130≤R≤225 215≤G≤355 540≤(2R+G)≤700 G≤(TD)+30(Gap) 185≤TD | NCC for Public Stairways 115≤R≤190 250≤G≤355 550≤(2R+G)≤700 |
| Nosing Strip for Luminance Contrast | Not Required | Strip depth between 50 to 75mm, with 30% Luminance Contrast with Background |
| Tactile Ground Surface Indicator (TGSI) | Not Required | Required According to AS1428.4.1 |
The specifications of table (1) are illustrated in figures (1) and (2).
Figure (1)- Stairway Specifications according to AS1657:2018
Figure (2)- Stairway Specifications according to AS1428.1-2009
Disclaimer: The listed specifications and differences are general and for a complete list of variations, review the listed standards.
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