Waterproofing of wet areas is one of the most commonly recurring major defects reported to Australian building regulators. When waterproofing fails – through poor installation and/or inadequate draining – moisture can penetrate the surface and damage the structure of the building, creating enormous problems for the homeowner.

An understanding of National Construction Code (NCC) legislation and the associated requirements of Australian Standard 3740-2021 (waterproofing of domestic wet areas) will assist you in helping your client see the value of this ‘invisible’ stage of a bathroom renovation.

In this technical bulletin, we set out the definitions of ‘wet areas’ and ‘waterproofing’, and cover the minimum requirements covered by the NCC and AS 3740. 

Download the Bulletin here.