Plumbing Technical Update: Overflow provisions in eaves gutters
Practitioners are reminded that eaves gutter systems must be designed and installed so that water will not flow back into the building.
Overflow provision requirements
Overflow provisions are to be provided along the entire length of the eaves gutters as overtopping can, and does, occur at any point in the gutter. These provisions are essential to prevent the loss of amenity, injury to persons and property damage.
Typical examples of eaves gutter overflow provisions are set out in AS/NZS 3500.3:2015 Plumbing and drainage Part 3: Stormwater drainage Appendix G.
For practitioners unable to meet any of the overflow provision measures set out in Appendix G, a Performance Solution, as referred to in the Plumbing Code of Australia, (PCA) may be an alternative method of achieving the performance requirements set out within the PCA.
For further information on Performance Solutions, the Australian Buildings Code Board (ABCB) has published a free guidance document covering the development of Performance Solutions, including examples.
For further information on compliant eaves gutter installations, please contact the VBA's plumbing technical advice line on 1300 815 127.