Choosing the right size for gutters and downpipes

Plannja roof water drainage products fit all roofs. The size of the roof determines the dimensions of required gutters and downpipes. The greater the roof surface area the wider the gutters.

Measure the length and width of each roof plane. If the surface area is less than 50 m2 then gutters with a width of 100 mm and downpipes with a diameter of 75 mm should be used. If the surface area is from 50 m2 to 100 m2 then gutters with a width of 125 mm and downpipes with a diameter of 90 mm should be used. For even greater surface areas gutters with a width of 150 mm and downpipes with a diameter of 100 mm should be used.

The length of the gutters is equal to the length of the building walls. Likewise, the length of the building also determines the number of downpipes that drain a gutter. It is assumed that one downpipe drains a gutter that is up to 10 m long. Houses with hip roofs should always be provided with two downpipes for each long side as well as gutters 125 mm wide. Houses with corner roofs should have their downpipes placed in accordance with the illustration. The downpipes should be appropriate for the roof surface area.

The above-mentioned dimensions represent the minimum recommended standard for efficient drainage. You can always choose a larger dimension for your system, but never a smaller one.