Roofing stormwater FAQs

Yes. A higher catchment area can be discharged directly to a rainhead or sump, or alternatively via a spreader, provided the applicable requirements of AS/NZS 3500.3, clause 3.4.5(a) and (b) are met.

Sarking is not mandatory under a metal roof unless the building is in a Bush fire Attack Level (BAL) defined area.

No. While not in the regulatory framework, the connection point to the stormwater drain would be.

No. HB39 Clause 5.3.2 (l) Box Gutters to be straight (without change in direction)

No. You are only responsible for the work you carry out. Provided you are only replacing the existing roof, not changing it or extending it, there is no obligation to upgrade the roof drainage system. If you notice other non-compliant works while quoting the roof, you should inform the client. If the client declines to have the non-compliance rectified this should be documented on your compliance certificate.