Do I need a drainage channel in front of the patio doors?
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We have 3 large sliding doors from the living/dining/kitchen area to the terrace. The terrace is partially enclosed by a balcony (with its own drainage). One door is secured under the balcony, 2 doors are not closed. The terrace must be connected barrier-free.
Do I need a drainage channel only in front of the 2 unclosed sliding doors or also at the closed sliding door?
Answer
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According to the regulations for unclosed ones, yes.
For closed ones, it depends on how they are closed.
Individually you can coordinate everything if you don't want a gutter. But then don't whine if there are problems.
The gutter must be 15 cm wide.
