Calculates the length and number of drainage channels or pipes required.
The guttering calculator works out the number of gutters, downpipes and outlets needed to drain rainwater from your roof.
Gutters = ⌈eaves length / section length⌉ Downpipes = ⌈house height / section length⌉ × number of drain points Outlets = number of drain points
Eaves 30 m, house height 5 m, 4 drain points, 3 m sections. Gutters: ⌈30 / 3⌉ = 10. Downpipes: ⌈5 / 3⌉ × 4 = 8. Outlets: 4.
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