Rainwater does not flow properly into the gutter and seeps into the masonry

Hello everyone,

after being basically very satisfied with our house construction, I have recently noticed some defects more frequently. A forgotten ventilation in the guest bathroom (still under clarification) and a few minor things (really just minor things).
Now last week I noticed an issue that I also need to clarify. I saw that there are damp spots starting from the slightly protruding basement wall (serves as a garage and is accordingly open to the street side). I then climbed up to the small front roof of the cladding. I took a watering can with me and poured some water onto the roof. I noticed that the roof tiles have an increasingly larger gap to the gutter along their length. Where it is damp, most of the water does not flow into the gutter but inward. (Pictures are attached and probably depict the situation better than I can describe it :-) ).
Since I have already paid in full, unfortunately, despite several phone calls, emails, etc., I am not getting any response. I have now written a notice of defects and would like to send it. This means that after always kindly asking for feedback until now, I now want to approach the matter a little more assertively. And here I also perhaps see the building structure somewhat at risk. Maybe someone can tell me if and how the situation can be fixed and whether it is a big effort.

In picture 1 you can see the effect.
In pictures 2 & 3 the spots where dripping water practically bends inward and flows inward.
In picture 4 then the situation as it actually should be.

Thanks and best regards

My assumption (layman's opinion): The marked areas are not designed to be backflow-proof, and wind pushes water standing on the sheet metal behind the sheet where it then runs down "inside." I see this as absolutely necessary to solve, otherwise more significant structural damage will follow.

The tiles lying on the gutter certainly contribute to this, and I wonder why it is done so differently/slanting or what the reason for this was?

The drip edge should have the same roof pitch as the roof, it is level, so it is clear that the water does not flow into the gutter. As already mentioned here, greater damage can occur.

Take one roof tile at the eave (gutter) and take a photo. If the foil lies loosely on the drip edge (eaves flashing), it can be glued on with Rissan tape.

Variant 1 for installing the underlay membrane at the eave
In this variant, the underlay membrane is guided into the gutter of the eave. The advantage is that any rainwater can already drain in a controlled manner into the gutter while the roof is still being covered. Unfortunately, this procedure also has some disadvantages:

[*]During further roof covering, damage to the underlay membrane often occurs due to stepping on it
[*]Eave ventilation combs must be used because the ventilation cross-section is restricted by the wedge batten
[*]Broken tiles remain unnoticed for longer because the water is drained through the underlay membrane
[*]The underlay membrane must be carefully glued to the eaves flashing so that water does not accumulate on it and cause the membrane to bulge

Variant 2 for installing the underlay membrane and eave
In this variant, the underlay membrane is guided under the wedge batten and a drip edge is installed at the eave. Water drips freely during roof covering. However, damage to the covering is easier to detect later because the water runs off the underlay membrane behind the gutter. In addition, a better ventilation situation is created. However, a ventilation grille should be installed on the counter battens.

Here, take a look, this is how it should look. In the 3rd picture (photo) you can clearly see how the foil is glued to the eaves flashing. What I don't like... is that the roof tile lies on the eaves flashing and does not extend over it into the gutter. The water will always run on the eaves flashing and over the years the drip edge (eaves flashing) will break and the water will run under the eaves flashing. If the roof tile extends over the eaves flashing, it drips into the gutter and your eaves flashing won't get any water on it ;)

I have forwarded it to the [GÜ]. Now a response has to come from there. However, it is a mystery to me how such work can be delivered. It must be clear that the water runs inward there. I now have to see what feedback comes. Ideally, I would like everything to be covered there to actually see if any damage has already occurred.....