Let it rain and long may it last!
Rainwater should run off the roof in a 100% controlled manner. The water drainage system should thus be made in accordance with good practice.
According to DIN EN 12056-3, guttering should usually be fixed with a 1-3 mm/m fall. Care should be taken to ensure that it protrudes sufficiently forward in relation to the bottom of the roof. This is so the water running off the roof does not bypass the gutter.
In regions with high snow fall, the front edge of the gutter should never be higher than the line of the sliding snow load, otherwise the snow may gather in the gutter and the excessive weight may pull it off.
Thanks to gutters water continues its cyle!
The gutter outlet feeds into the downpipe which leads in turn to a drainage pipe. Usually, several small roof slopes are connected to a single downpipe. In the event of heavy rain, overflowing gutters are a common occurrence and can damage façades. Therefore, we recommend adding extra downpipes to avoid expensive repair work to the façades later.