Create balcony sealing

Hello,

I have the following concern: We have a house with a balcony that is practically recessed into the roof. The ceiling slab is made of concrete, but the balcony, which is recessed or rather built in at this height on the outside, has a wooden structure underneath because it is basically at ceiling height but extends outside at the height of the roof overhang. It protrudes as far as the roof extends. (Start of the balcony = end of the roof).

We do not know how the roof structure looks underneath. We only know that the floor of the balcony was covered with roofing felt and water always stood there at the beginning because the felt was very wrinkled. Therefore, a slope was created using screed, by pouring the screed onto the felt and then applying a rubber-like material from PCI as sealing.

In the meantime, cracks have formed in the screed slab because the wooden structure underneath naturally moves. Some cement is blooming out of the cracks.

Is the construction recommended back then actually okay? How is something like this properly built? Besides a complete metal tray with a slope, is there no other solution than repeatedly patching roofing felt?

Isn't there something like roof tiles in tile form that interlock and create a drainage channel underneath?

I would be very happy to get advice, as we really don't know whether the whole thing is top or flop.

Hello "Snakey". Whether the setup was okay as it is, I (as an expert) can only tell when I see all system components and also the type of installation. There are too many possibilities, even with an apparently proper setup, to make crucial mistakes in places that are beyond the eye of the technical layperson (necessarily). To avoid falling into the category of "know-it-alls," I also want to refrain from speculating about the WHY. Just this much: based on the information you have provided here, it does not necessarily have to lead to cracks in the screed, ---------------------- Regards: KlaRa