Table 3

Recommended gutter sizes

Area of roof served by one gutter (m2) 10 13 17 21 29 34 40 46 66 
Semi-circular or trapezoidal gutter (recommended width in mm) 50 55 60 65 75 80 85 90 100 
Recommended down-pipe size (outside diameter in mm) 15 20 25 25 32 32 40 40 40 
Area of roof served by one gutter (m2) 10 13 17 21 29 34 40 46 66 
Semi-circular or trapezoidal gutter (recommended width in mm) 50 55 60 65 75 80 85 90 100 
Recommended down-pipe size (outside diameter in mm) 15 20 25 25 32 32 40 40 40 

Source: Thomas & Martinson (2007).

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