Concrete quality okay or defect - experiences?

So ... and now to the big "construction sites" (I already feel sick)

They concern the shell construction, execution of the white bathtub, concrete cover and perimeter insulation, Isokörbe. Since all the following topics belong to the shell construction area, I hope it is okay to put everything into one thread.

Our house is completely reinforced concrete (I wouldn’t do it that way anymore), ready-mixed concrete, no precast walls, executed with a white bathtub. Before I gather all the data, if necessary, first rough questions, the answers to which I probably already know.

1. White bathtub:
A joint sheet metal has been inserted at the transition from the basement floor slab to the basement walls, in my opinion also technically correct.
At the transition from basement walls to basement ceiling this was (probably) not done. This is probably not mandatory either, but a horizontal sealing of the construction joints should be present, if I have understood the numerous threads on this topic correctly. This is missing. Already backfilled, garden/terraces all finished.
Anchor holes have been closed with ??? an expanding agent … I cannot remember the name of the material used.
Deficiency?

2. Perimeter insulation:
The perimeter insulation boards partially have a gap of about 1 cm from the wall, which allows water to run behind.
The basement was built at very low temperatures (November), the 2-component adhesive from Ma*** used was very viscous and difficult to work with, partly the glue points and thus the boards have later loosened. The glue points themselves sometimes had a thickness of 1 cm.
Statement from the site manager (our) from memory, "if water should ever accumulate, how much water can get in, besides we are in the frost-free area."
Partly corrected.
Deficiency?

3. Concrete walls:
Our shell construction was halted for a winter during the Corona period. Afterwards, rust marks appeared on exposed exterior and interior walls. (unnoticed by the construction management)
Causes, in my opinion, on the one hand gravel nests and on the other hand insufficient cover (no spacers, or detached).
After much back and forth, a concrete restorer was commissioned by the construction company, who exposed the affected areas, derusted with a brush (no sandblasting), and applied corrosion protection and repair mortar (manufacturer from Augsburg).
My questions,
- should the cover of the reinforcement adjacent to the affected areas (which have not yet reacted) have been measured?
- what exposure class applies under ETICS and is a smaller cover tolerated here?
- what if rust under ETICS causes everything to burst?
Statement of the site manager, "what could possibly happen here, no structural function of the walls, also covered by ETICS."
(see sample photos)
Deficiency?

4. Upstand of projecting balcony:
The balcony running around a corner (approx. 14 m) was cast on site, on Isokörbe, monolithic. It has an approx. 10 cm wide upstand, approx. 20 cm high. Small gravel nests were visible on this upstand from the beginning. Originally we wanted to just paint, but after rust stains appeared in numerous places, we had to plaster.
I never saw the planning for the concreting work, but I remember that there was a discussion during the formwork about the dimensioning of the Isokörbe. The construction company said Isokörbe were too weak, planner/site manager/structural engineer said they fit. Perhaps it was agreed in the discussion to make the upstand narrower for weight reasons, but that is speculation.
Question:
- is it even possible to insert bent reinforcement into a 10 cm wide upstand without maintaining the minimum cover?
(Photo)
Deficiency?

5. Isokörbe, sealing and dimensioning:
The balcony slab has been provided with a slope and sealed on the tinsmith’s side. The sealing consists of 2 layers of bitumen membrane, with slope panels underneath.
So, no sealing directly on the concrete surface of the balcony and no sealing on the Isokörbe.
The site manager said, overall this is not a sealing like on a roof terrace, it can happily fill up with water.
Correctly executed??
I would like to have the load-bearing capacity of the Isokörbe checked. Would anyone like to undertake this contract? If so, please get in touch.

Many thanks for the support, also in the other threads.

hello, Regarding 1: The holes must be sealed with fiber cement plugs, which are glued in with a 2K epoxy adhesive. Regarding 2: According to various manufacturers, the perimeter insulation can be spot glued with 2K on "moist soil" without pressing water. Are you sure the adhesive was viscous due to the cold, or was the processing time of 60-90 minutes exceeded? We glued very meticulously, yet the insulation still protrudes about 8mm for us. Unfortunately, I am not familiar with the rest. Based purely on the photos, our concrete basement looks significantly better.

Regarding point 5, I would say that the precast concrete slab should actually have been sealed as well. Then insulated and sealed again. But what is underneath? Living space would of course be disastrous, but since you mention balcony, I assume that is not the case. On the topic of defect: what was commissioned and what was paid for?

Thank you for your answers

Regarding 1: The holes must be sealed with fiber cement plugs, which are glued in with a 2K epoxy adhesive.

This was simply forgotten in our case, the site manager did not notice it. Since the perimeter insulation was already installed and backfilled, it was sealed again from the inside with a swelling agent.

Regarding 2: With "moist soil" without pressing water, according to various manufacturers, the perimeter insulation can be spot-glued with 2K. Are you sure the adhesive was viscous because of the cold, or was the processing time of 60-90 minutes exceeded? We glued very carefully, yet our insulation also sticks out about 8mm.

It could of course be that the open time was exceeded, I was told it was due to the cold. What puzzled me was only that the smearing on the joint edges of the perimeter insulation was noticeably thinner. Is it now a problem that the insulation can be penetrated from behind?

Just from the photos, our concrete cellar looks significantly better.

The photos are not from the cellar, but from the upper floor, exterior wall. I do not have cellar pictures because I was not there during stripping, and our site manager "accidentally" deleted all photos for documentation.

Regarding point 5, I would say that the precast concrete slab should actually have been sealed as well. Then insulated and sealed again. But what is underneath? Living space would of course be fatal, but since you mention a balcony, I assume not. Regarding the defect: what was commissioned and what was paid for?

Thank you for your answer. Below is no living space, but partly shutter boxes and insulated rhombus cladding. My concern is whether this could lead to a problem, e.g. corrosion, and whether it should have been commissioned ... keyword structural engineer/construction manager

I don't have any basement pictures because I wasn't there during the formwork removal, and our site manager "accidentally" deleted all the photos for documentation.

I probably would have "accidentally" reversed his payment as well. I wonder what kind of strange assignments you gave your planners. And apparently, it’s not really a "plain ordinary" house - but one where the builder should have been aware of the necessity of tight active supervision.