NCC Version:
NCC 2022 Volume Two
Area of NCC Requirements:
H2P2 – Weatherproofing
Problem:
The proposed rooftop garden for a two-storey dwelling falls outside the NCC’s Deemed-to-Satisfy (DTS) provisions for weatherproofing, as no specific DTS criteria exist for rooftop gardens. To ensure compliance with Performance Requirement H2P2 and prevent water penetration or structural issues, a Performance Solution is required.
Solution:
Performance Solutions Australia assessed the rooftop garden’s waterproofing design and made refinements to ensure compliance with NCC Performance Requirement H2P2. Adjustments were made to the construction method to cover all relevant NCC areas, ensuring a Functional Statement could demonstrate compliance. The solution confirms that the waterproofing system, including drainage and membrane installation, will effectively prevent water penetration and will not adversely impact the building’s structural integrity.
Finalised Report:
The report confirms that the proposed rooftop garden's waterproofing system meets NCC Performance Requirement H2P2 using documented evidence and expert assessment. The Performance Solution was developed in collaboration with stakeholders, including the building owner, builder, building designer, and surveyor.