AUST – HENDRY building surveyors advise that providing proper access to your mechanical ventilation and hot water, warm water and cooling water systems in your buildings under AS 1657-1992 ‘Fixed platforms, walkways, stairways and ladders – Design, construction and installation’ Part I1.2 of the Building Code of Australia requires mechanical ventilation and hot water, warm water and cooling water systems in a building other than a system only serving a single sole-occupancy unit in a Class 2 or 3 building or Class 4 part to be maintained in accordance with AS/NZS 3666.2: 2002 ‘Air-handling and water systems of buildings – Microbial control – Operation and maintenance’.
Section 2 of AS/NZS 3666.2 “Operation and maintenance of air-handling and water systems of buildings-microbial” requires easy and safe access and egress for cleaning, inspection and maintenance to all plant, equipment and components of air-handling and water systems of buildings by complying with the relevant requirements of AS 1657, AS 1470, AS/NZS 1892.1 and AS/NZS 2865.
AS 1657 ‘Fixed platforms, walkways, stairways and ladders – Design, construction and installation’ has specific requirements such as the cross fall for drainage of platforms and walkways should not exceed I in 35 or 1.64 degrees. There are no exceptions under AS 1657 for walkways not to be protected by guard railing other than at points of access or where there is a permanent structure not more than 100mm distance from the edge of the walkway which must give the same protection of guard railing.
Building Legislation Table
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Fire Safety Compliance: Essential Safety Measures