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 (BCA) 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 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.
Referenced standards like AS 1657 in the BCA must be complied with in the building approval process.
Building Legislation Table
Refer to our Building Legislation table for further information on the building control process.