Bathrooms are the major wet area in the house and it is important that the bathroom is correctly waterproofed in order to reduce the risk of structural damage occurring as a result of dampness, water leaks, or condensation. The Building Code of Australia and the Australia Standard (AS 3740-2010) outline the minimum requirements for waterproofing in residential bathrooms.  


These requirements include:

• waterproofing the full floor within the shower recess

• at least 100mm over the hob or step down onto the bathroom floor should be waterproofed

• at least 150mm up the walls inside the shower walls needs to be waterproofed

• the vertical angle between any two walls in the shower needs to be waterproofed up to at least 1800mm high

• the entire bathroom floor needs to be waterproofed if it's timber flooring, plywood or particleboard, or if it is above the ground floor of the house

​