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Planning for waterproofing of concrete balconies
NCC 2025 introduces significant new Deemed-to-Satisfy requirements for the drainage, grading and waterproofing of concrete balconies and external areas. These changes affect design, construction sequencing, waterproofing and drainage detailing. Getting it wrong could result in defects, water ingress and costly remediation.
This practical guide breaks down the five key considerations builders, designers and contractors need to understand, including whether the DTS provisions apply, how to achieve the required 1:80 falls in the structural substrate, membrane preparation requirements and compliant surface finish options. It also explains new rules around step-downs, membrane termination heights and level-entry designs.
Learn how NCC 2025 changes drainage design, including floor wastes, external gutters, overflow requirements and monolithic hobs. With practical guidance, technical explanations and key compliance considerations, this resource will help builders confidently design and construct compliant external concrete areas under the new NCC framework.
Access this resource now
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Who is it for?
Building Professionals
Residential building industry professionals in Australia.
What does it include?
- Are the area and method covered by the DTS provisions?
- How are falls provided with a minimum gradient of 1:80 to a stormwater drainage system?
- Has the surface been prepared to receive the membrane?
- What surface finish will be used?
- Does the design use floor wastes or external gutters?
- When do the new requirements take effect?