All You Need To Know About Waterproofing Regulations In Melbourne
Building elements which are classified as wet areas, such as showers, should be waterproof as per the National Construction Code (NCC) and should comply with the Australia AS3740 – Waterproofing standards for wet residential areas. These wet areas have been experiencing consistent defects as a result of waterproofing failure. To cap poor installation practice in waterproofing areas, AS3740-2004 was introduced as an improvement of the earlier fashion AS 3740-1994. The law was amended to regulate the poor installation practices that had been witnessed in Wet Areas. It is always important to obtain wet area certificate from local authorities before waterproofing as it might be necessary, in your code area, that a certain waterproofing elements be done by a Waterproofing Contractors who is fully certified.
Waterproofing Regulations in Melbourne considers bathrooms, laundries, showers and toilets as wet areas and should only be constructed with waterproof elements. The Australian Standard AS3740 provides details of other areas where considered wet areas in your home and required to be water-resistant. Note that, for wet areas with timber floors such as timber sheet flooring such as particleboards or plywood sheet flooring, the entire floor outside the shower area must be waterproof. At the same time, floors and wall junctions should feature Waterproofing Membrane whether they are made of timbers or fibre-cement. If compressed fibre cement or concrete are used in wet areas, the floor must be at least water resistant.
The BCA regulation in part 2.4.1 states that “To protect the building’s structure and keep occupants’ amenities clean, water must be prevented from penetrating through the walls on the wet areas into concealed spaces of the sanitary facility.” Floors and horizontal surfaces adjoining an insert must be waterproofed. In where floors are waterproofed, walls of the bath/floor and Wall/floor should be tanked to a minimum of 25mm above the finishing floor level with a horizontal leg of 50mm adhered to the floor. Bound breakers should be installed in where the membrane is bonded to the substrate such in the wall-to-wall floor and hob-to-wall junctions. Plasterboard nails and joints head in the showers is expected to be waterproof treated.
The Waterproofing Regulation Standards In Melbourne VIC
Hobs should only be constructed on concrete and masonry but not timber and should be secured adequately to the floor. Showers screens must have a fitted flush on the inside of the hob. Frameless shower screens should feature a full floor waterproofing system and fixing penetrations must be sealed. Waterproofing membranes are expected to extend to a minimum of 50mm onto the floor over the outside of the hob face.
Flashing applies to some wet areas such as bathrooms and toilets but not the kitchen. Flashing materials must be made of materials that are deemed waterproof such as stainless steels, copper and waterproof flexible sheet flooring materials with sealed joints or membrane meeting. Floor wastes are not necessary on Class 1 buildings but are a requirement in Class 2 building where the floor of the bathroom is located above another sole of occupancy unit.
According to the Waterproofing Regulations in Melbourne, Doors architraves and jambs installed before floor tiling installations should be waterproofed to the finished floor to ensure a continuous seal between the perimeter flashing and the water stop. It is important to install the doorjambs and architraves above floor tiling where possible.