Gutters Downpipes and Overflow Calculator

Thursday, 9 February 2017 Image of a residential houses gutter and downpipe

The new GDO calculator has landed!

A Beta testing version of the new Gutters, Downpipes and Overflow (GDO) Calculator is now available.

The GDO Calculator assists users to understand the Gutters and Downpipes Acceptable Construction Practice (ACP) provisions in NCC Volume Two.

Using the GDO Calculator is easy – simply enter information about the location, roof design and types of overflow measures, and the calculator will provide the gutter type/s required, allowable downpipe sizes and whether the selected overflow measures are adequate. The Calculator is a MS Excel file and uses data contained in NCC Volume Two.

Interested users can access the Beta testing version of the GDO Calculator now. Users are invited to provide feedback on the Calculator and its performance.