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How to waterproof the flat roof of a terrace/slab?

We are building a new house and are currently working on a terrace. We would like to build it over our garage, which should have a flat roof. The height of the structure inside is 14 cm, the balcony door has no threshold, so there is also 14 cm for the structure outside.

Currently, the floor slab is not sloped. In fact, a sloped screed is/was planned to extend over 7 m. The architect advises a 0 degree roof, which is more of a pain in the stomach for us, so now a sloped screed. XPS 40mm insulation will be used, and there will be a foil and fleece on top, so the structure will be 43mm, which is already a given. Everything else is exposed. Do you have any ideas on that?

As far as covering, we're pretty flexible.

• waterproofing system