Internal or ‘within roof area’ gutters (also described as box gutters) are seen as an easy solution to the collection and disposal of roof water. However, significant inconvenience, damage and health issues may occur if one overflows.
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The best way to deal with internal gutters is to design them out, but sometimes, this isn’t an option. With good design and construction and ongoing maintenance, the risk of an internal gutter overflowing can be minimised.
If an internal gutter that provides drainage from a metal roof overflows, the only place the water can go is into the building below. This is not only inconvenient but can cause damage. How can these problems be avoided?