Calculate with confidence.

Use our suite of calculators to design correct and conforming roof drainage solutions.

Flow Rate Calculator

Everything on a roof is defined by its' flow rate. Use this tool to calculate precisely how much water each segment of the roof is flowing.

HCO Calculator

Forget the 12 step method. Our HCO calculator makes it easy to size and spec a real High Capacity sump.

SSO Calculator

Another confusing method, simplified. Use this calculator to spec your Side Overflow Sumps.

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