Large roofs use box gutters both at the perimeter and internally, which are treated in AS 3500.3:2003 and HB114:1998. Box gutters are a bracket shape, fully supported along the whole length of the bottom.
Eaves gutters are used on small and medium roofs (most standard residential buildings). There are several types of eaves gutters, including quad gutters, squareline gutters, OG guttersand half round gutters.
Modern gutters often have overflow slots running horizontally through them. These help with the draining process and can be useful in reducing the amount of ponding. Metal fascia, as opposed to timber fascia, are attached to gutters and promote longevity and weatherproofing.
Maintaining gutters regularly is an important element in consistent roof drainage systems. Taking into account how much maintenance is needed is an important part of designing a good system.
To make sure your rainwater system complies with the current Building Code of Australia, see our Overflow Solutions Guide.