Baseboard for uneven wall & tiled floor

We actually took "normal" wooden baseboards and attached them with mounting adhesive... it holds quite well and we sealed the gaps with acrylic, which also worked well. How it will hold up in the long run remains to be seen but yes, probably it will eventually become unnoticeable

We have not had good experiences with acrylic. It all becomes sticky and dirty and very difficult to clean over the years. We have therefore omitted it with the new flooring.

@"Kirschkugel":
Uneven wall surfaces as well as borderline exceeding flatness of a floor surface do not fall under "standard-compliant," thus not state-of-the-art fundamentals, on which a trade compliant with the professional regulations (external) can be built.
Either the substrate is leveled, or one has to come to terms with the idea that at least prefabricated elements (such as base tiles or baseboards) cannot be used here.
That base elements detach again from the wall surfaces is a completely different issue.
Its cause(s) are communicated to us by the fracture zone and, if applicable, also the fracture depth, which we find on the reverse side of the fallen wall or base elements.
There is no standard solution for your problem!
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Regards: KlaRa

I can support this with an appropriate image. Flatness of the topcoat vs. baseboard.

I can support that with an appropriate picture. Flatness of the top coat vs. baseboard.

Well, I would actually seal such small joints elastically with a (paintable) acrylic.
There is absolutely nothing against that.
Whether a flooring installer actually has to check the flatness of a wall surface before installing the baseboard, I would first need to research as well.
However, for such a small room corner, it is hardly worth engaging with the building code or the VOB as a "prayer book in hand" with the contractor!
In the experts' terminology, this would be classified as a "trifle" (even if a client, who is naturally emotionally connected to their property, might see it differently)

Well, I would actually use (paintable) acrylic to elastically seal such small joints.
There is absolutely nothing against that.
Whether a floor layer really has to check the flatness of a wall surface before installing the skirting boards, I would also have to research that first.
However, in such a small room corner, it hardly makes sense to want to argue with the contractor using the Building Code or the VOB as a "prayer book in hand"!
In the expert terminology of surveyors, this would be called a "trifle" (even if a client, who is naturally emotionally attached to their property, might see it differently)

A single photo may not convey this. A cumulation of "trifles" within the same trade eventually no longer counts as a trifle.
The skirting boards can normally be wiped clean with slight moisture, but this works increasingly worse the more corrections have been made with structural acrylic. At some point, this does become an issue.

Dealing with practical problem-solving without personal responsibility from theory alone is and has always been easy. The original problem posted here, crooked walls for the purpose of attaching baseboards, would actually be very easy for the floor installer to solve before starting his work: He talks to the client about it and gives him two options within his decision-making area: 1.) The client has the wall surfaces straightened by the preliminary work before the floor covering work begins, or 2.) the client accepts the joint formations above the baseboards caused by uneven wall surfaces, for which he is not responsible. ------ One can easily recognize from this example that the currently presented situation on site, given the considerable effort for wall straightening (possibly even plural), is the practical one, which very likely would also be supported by the client if the effort for straightening had been explained to him. So what is missing in the case described here is merely the preliminary discussion with the client. From one's own perspective, probably every client would have decided in favor of the option under (2), since a (by the way professionally legitimate) concealment of the joint openings above the baseboards results in no noticeable disadvantages in use. Therefore, one should not overestimate this process listed here by "Kirschkugel" or assign it a significance that it does not deserve from a professional point of view. --------------------------- Greetings to the group: KlaRa