All Dam Buster rain heads are engineered around maximum flow rates, not dimensions.   

You can select, buy and install Dam Buster rain heads with confidence and no Performance Solution is required. 

Please follow the methods in AS/NZS3500.3 to determine the flow rate and what size box gutter and down pipe you want to use, then select the appropriate Dam Buster product based on flow rate, or otherwise Contact Us.  

Because Dam Buster rain heads are very high performance products, in general, 200mm and 300mm Dam Buster models (with correctly sized box gutters and down pipes) are more than adequate for even a large domestic house in most States and Territories of Australia, with the 400mm, 500mm and 600mm models more suitable for areas of very high to extreme potential rainfall or else in commercial applications.  

NOTE: We don't make custom designs or custom sizes except for Architects and Designers who want to incorporate the innovative Dam Buster features into a unique feature piece of rain head art for equally unique buildings.  Please Contact Us to discuss these options for your project. 

Choosing the right size box gutter to suit your Dam Buster is also extremely important; box gutters must also be correctly sized according to AS/NZS3500.3.  Don't forget that bigger is not necessarily better and bigger also costs a lot more to build. If you are not sure, speak to your Hydraulic Engineer for more information about correct box gutter sizing. 

Engineer test certificates with more technical information on the Dam Buster rain head range can be downloaded below. 

If for any reason you still need help with correct product selection, please get in touch with our technical gurus via the Contact & Warranty page or else direct by email to  

If you are in the design phase for your new home or project, working with your Architect or Designer we can also refer you to a low cost engineering service who will ensure your roof plumbing installation will be 100% compliant.  

Phone inquiries can be made to Russell on 0409 716974 in normal business hours for Victoria.

Dam busters work like a waterfall
Dam busters work like a waterfall


Watch the video to see how easy and quick it is to install a Dam Buster rain head. 

NOTE: All Dam Buster products need to be installed by an appropriately licenced person such as a Roof Plumber.  Check your local regulations if unsure. 


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