Flat roof - There is water on it

Hm... how is the warranty on the roof if I independently plant it? If water gets through after 3 years due to a construction defect, they'll just laugh at me :rolleyes:

We are no longer in the 70s, the biggest enemy of your roof is no longer the leak itself but the UV radiation, which unfortunately attacks and makes your beautiful membrane brittle in too short a time, which in turn leads to leaks. We spoke with many professionals in advance of our construction, and the unanimous opinion was: the main thing is to have something on it, even if it's just gravel. Green is better because it keeps things slightly moist. But nothing is nothing. The main roof was done by the general contractor, the small roof of the bay window I did myself, it is truly doable at manageable costs.

But do as you like, this was just a forum advice...

As an addition, I finally dared to climb onto the roof and measured 2.5 cm of standing water. Unfortunately, I had forgotten the level :\

You have a really big spirit level standing on the roof ;) I find 2.5cm way too much, where is the slope towards the drain?