High-performance roof drainage solutions engineered to improve box gutter overflow protection and comply with Australian standards.
Jump straight to the components you need for your next roofing project
Dam Buster provides innovative roof drainage components designed to manage high rainfall events and improve box gutter performance across residential and commercial projects.
Comprehensive fabrication and manufacturing solutions tailored for roofing contractors, builders, and commercial projects.
Australian-designed rainheads engineered to safely discharge water from box gutters and perform reliably during extreme rainfall events.
Dam Buster sumps provide a modern alternative to traditional box gutter sump systems with simplified sizing and superior overflow performance.
Innovative direction-change devices designed to redirect water flow safely from box gutters to the point of discharge.
Engineered components that allow upstream direction changes in box gutter systems while maintaining efficient drainage flow.
Our team can help you select the correct Dam Buster solution for your roof drainage system.
Send us your project details and our team will guide you toward the best Dam Buster solution.
The Dam Buster system relies on a continuous, gravity-fed flow to manage heavy rainfall efficiently. The process begins inside the box gutter, where water flows toward the discharge point.
If the layout includes corners or obstructions, Elbows and Junctions alter the flow path upstream without restricting capacity. As water reaches the end of the gutter, it enters a Free Flow Sump or a Side Outlet, which funnels the water externally.
Finally, the water enters the rain head. If the downpipe blocks during a severe storm, the rain head’s internal weir and unique overflow chute activate. This mechanism forces water out the front of the unit, completely isolating the building interior from potential flood damage.
Dam Buster rain heads feature a patented internal overflow weir set 25mm below the box gutter sole. This guarantees water safely discharges outside, whereas standard units frequently fail and cause internal flooding during heavy storms.
Yes. Every component is independently tested and certified to meet the NCC and AS/NZS3500.3:2021 standards for 1-in-100-year storm events.
No. Dam Buster products are selected based on the required flow rate (litres/second). This eliminates complex calculations and removes the guesswork from installation.
Absolutely. Because they do not require internal pipework or large bulkheads, Dam Buster side outlets and sumps are ideal for fixing existing, non-compliant box gutters without major structural changes.
Our Revesby facility is built for speed. We offer rapid turnarounds on all Dam Buster products and custom flashings to keep your project on schedule. Contact us for current lead times.
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Don’t risk audit failures or internal flooding with non-compliant components. Speak to the team at HMR Supplies to specify and order your certified Dam Buster roof drainage sumps, rain heads, or side outlet drainage systems.
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