Scuppers/Overflows
Integrated outlets that serve as an essential backup for flat roof drainage systems.
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Pre-formed for compatibility with membrane waterproofing systems.
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Allow safe overflow of stormwater to prevent ponding and structural damage.
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Custom sizes available for tailored hydraulic requirements.
Introduction
Scuppers and overflow outlets are essential components in flat roof drainage design, providing backup protection when primary outlets are blocked or overwhelmed. Installed through parapets or edge details, scuppers direct excess stormwater away from the membrane surface, reducing the risk of ponding or structural overload.
Nuralite scuppers are designed for compatibility with Nuraply membrane systems and are fabricated to support long-term performance under New Zealand’s variable weather conditions. They are typically installed at critical points in the roof layout and must be detailed to ensure watertight connections with the membrane.
These components are widely used on schools, commercial buildings, and government projects as part of compliant drainage strategies. For designers, scuppers and overflows provide peace of mind and an added layer of resilience, helping to meet NZBC drainage requirements.
Considerations
Vulnerable to blockage: Leaves, debris, and bird nests can obstruct scuppers. Without regular maintenance or secondary overflows, this can lead to water backflow and membrane stress.
Design for extreme rainfall: Scuppers may not handle intense downpours unless correctly sized. Always ensure an additional pathway, such as an overflow system, is provided.
Requires precise integration with membrane: Waterproofing must be carefully detailed around scupper outlets to avoid leaks — especially at upstands and junctions with parapet walls.
FAQs
What are the technical benefits of using roof scupper NZ?
Where is roof scupper NZ typically installed on a flat roof?
Does roof scupper NZ comply with NZ building code requirements?
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