Balconies and loggias should be drained via a drain or a curtain drainage channel.
Balconies and loggias with a closed parapet must be provided with an emergency drain or an emergency overflow with a clear width of at least 40mm through the parapet in addition to the drain. The clear width of 40mm serves to prevent flooding when it rains, even if the drain is clogged with leaves, for example. For uncovered balconies with an area of more than 10m², check whether a clear width of 40mm is sufficient for the emergency drain/emergency overflow. The drainage of the building must be able to drain the building for 5 minutes in the event of a once-in-a-century rain event expected at the location.
The drainage of balconies and loggias must not be connected to rainwater drainage pipes of the roof drainage, even if there is an emergency drain or overflow. The same applies to terrace drains. If balconies and loggias do not have a closed parapet, separate rainfall pipes can be dispensed with. At least 50% of the parapet must be available as a free drain. This allows the water to drain through the open parapet in the event of flooding. Boundaries with glass facades or the like also count as open parapets if the water can drain freely under them.
1986-100 provides for the possibility of directing rainwater from roof, balcony and loggia drainage into main drainage pipes.
The general ban on connecting the drainage of balconies and loggias to rainwater drainage pipes for roof drainage, which was in force until December 2016, has been lifted. Drains of loggias and balconies on the ground floor should be connected separately to the rainwater underground pipe for safety reasons.
Uncovered balconies are to be treated like roof surfaces.
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