What Is a Waterproofing Certificate?
A waterproofing certificate is an official document issued by a QBCC-licensed waterproofing contractor confirming that waterproofing work has been completed in compliance with AS 3740 and the manufacturer's specifications. In Queensland, this certificate is a mandatory part of the building compliance process for wet area construction and renovation.
When Is a Certificate Required?
A waterproofing certificate is required for all waterproofing work in domestic wet areas in Queensland. This includes new bathroom, shower, and laundry construction, renovations where existing waterproofing is disturbed, and any remedial waterproofing work. The certificate must be issued before tiling or finishing work can commence over the membrane.
What Does the Certificate Include?
A properly completed waterproofing certificate should include the contractor's name and QBCC licence number, the property address and location of the waterproofed areas, the waterproofing membrane product used (brand and type), details of the areas waterproofed including membrane heights, confirmation of compliance with AS 3740, and the date of completion.
Why Certificates Matter
Waterproofing certificates are important for several reasons: they are required by building certifiers for sign-off, they provide evidence of compliance if disputes arise, they can be important for insurance claims related to water damage, and they add value and confidence when selling a property. Always retain your waterproofing certificates with your property records.
What If You Don't Have a Certificate?
If waterproofing work was carried out without a certificate, it may not comply with Queensland building regulations. If you are purchasing a property or have concerns about existing waterproofing, we connect you with QBCC-licensed contractors who can inspect the work, conduct testing, and advise on compliance status. Request a free assessment through our platform.