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Balcony: I do not know the current standards. I guess there must be 2 sips (by security) to evacuate rainwater. What is the regulatory diameter if roof terrace, if balcony of -de 20sqm if balcony of - 10sqm?

To my knowledge, there are no specific standards on the diameter of water evacuation from balconies or terraces. The squeezers are really only mandatory in the case of balconies equipped with guard rails closed (masonry in general). Also see my answer to a previous question on the subject.

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