HIA has heard from members about a number of situations where they have been pulled up by an inspector on NCC waterproofing requirements for laundry troughs. This is because the installer has only provided water-resistant lining to one wall where the laundry trough or basin has abutted two or more walls. The walls were also within 75mm of the trough as seen in the image.
The NCC Table 220.127.116.11 and clause 18.104.22.168 require that the wall adjoining a vessel such as a sink, basin or laundry tub must be water-resistant to a height of not less than 150mm above the vessel, for the extent of the vessel, where the vessel is within 75mm of a wall.
A vessel by definition in the NCC means an open, pre-formed, pre-finished concave receptacle capable of holding water, usually for the purpose of washing, including a basin, sink, bath, laundry tub and the like.