Gutter Fall

All gutters should have a minimum fall of 1:500 (2 mm in 1 m). A 1:200 (5 mm in 1 m) fall will give faster water flow and better self-cleaning, but it may look unattractive on external spouting due to misalignment with the fascia, and exposure of roof sheet ends, on longer lengths

Effect of Gutter Fall on Drainage Capacity

Effect of Gutter Fall on Drainage Capacity (2)