Laying parquet, in which direction?

Hello "werschtl", a heated screed certainly does not constitute a "defect"! But this installation method as "screed on insulation layer" (by the way regulated in DIN 18560 Part 2) was not or is not the focus. Rather, it was the - let's say "strange" - hints and terms that were thrown into the ring during the participation on this topic. If small flakes come off a screed surface - as you now describe - the subsequent installer will have to carefully consider whether to remove them himself or raise concerns. The latter approach might be the right one if (which I of course cannot judge from a distance) the screed is defective. In this case, a written notice of defects would have to be issued to the screed layer. If now your tiler takes the matter into his own hands, the screed layer is immediately released from responsibility and warranty, since the tiler has accepted the screed work as proper! You may realize at this point that it might not be so simple after all. As far as your comments, which you conveyed, were taken directly from the tiler’s statements without embellishment, my lines still apply! The tiler, like the floor and parquet layer, only has the obligation to carry out a so-called cleaning grinding. The casual expression in construction jargon is: "He just runs the machine over it once." He does not have to do more, except remove any dirt deposits settled in the meantime from the screed surface. Removing flake-shaped detachments of the screed surface, no, that certainly does not belong to his tasks and, as I mentioned before, may have legal consequences. For example, if the screed surface has significant defects (which your tiler does not recognize, although he should), and he accepts the screed in any way, then the follow-up costs for the proper completion, which you as the builder can claim, remain solely with him. The screed layer will lean back smiling and whistle a tune. Rightly so! ------------------------ PS: I am writing all this not because I am bored these days or a desire for recognition makes me pick up the pen, but rather to contribute my experience here in this forum and to warn builders like you against missteps (also by others). Best regards: KlaRa

Hello KlaRa,
thank you very much for the detailed explanation, I find that very kind and helpful, now I understand what it is about.
Tomorrow I will take a photo of it and upload it. Surely something is wrong, on the screed surface you can see small bubbles exactly above the loops of the underfloor heating. The screed installers probably need to do the grinding. Then I will report this as a construction defect.

Thanks again for the competent help

Best regards Frank

@KlarRa,
I uploaded a picture, this is how it looks, at the spots where people walk these spots are coming loose. The plumber also confirmed to me that it is the work of the screed layer.

Best regards, Frank

Hello "werschtl", the situation as it appears in the photo does not seem as bad as initially suspected. It is quite possible that the cloud-like shading can be removed by a cleaning grind by the tile setter (but this is a free service that the floor layer must always include in his calculation). Only if he (to put it extremely) for example "digs in" with the grinding machine into the screed (due to lack of strength of the screed), should the screed layer be involved. The same applies if the tile setter notices a lack of suction on the screed surface after the cleaning grind through a drip test or if pieces peel off in chunks during the so-called "hammer test". Please take the mindset into account: "Bange machen gilt nicht!" That means: approach the matter calmly and above all with expertise. Wild speculation will certainly not lead to success. Please describe soon how the matter turned out! ---------------------------- Best regards: KlaRa

Thank you very much, yes gladly, I will report. It is not entirely clear to me whether the sinter layer removal is the final step of the screed installer? In my case, it would then be a construction defect. I took over the apartment with the option "Floor work in own performance". Therefore, I suspect that the developer will respond to me that these are the tasks of the floor installer. Best regards Frank

Hello "werschtl". At the point where you are, the technical layperson is dependent on the help of experts. From my point of view, there are only 2 ways to assess the process: a) the screed surface can be brought into a state suitable for covering with a cleaning grind, or b) the screed surface shows defects. However, checking this is practically hardly possible for the layperson. If it is a defect in the screed surface (not fundamentally to be excluded), the screed layerer has the right to rework with an effort acceptable to him. However, his contractual partner must notify him of the defect in writing. Assuming you yourself had a contract with a general contractor, then you would have to notify him of the defect (of course in writing) so that he can pass it on to his contractual partner, the screed layerer. Doing floor work yourself does not override the (own) right to a defect-free screed (or surface)! And whether the developer passes it on as you fear, I would first let it come to that. Further procedure: have a specialist who rightfully carries this designation determine the ACTUAL condition of the screed, only then respond further if the defect should actually be confirmed. The "danger in the background" is of course the delay, since the floor covering cannot be laid. But this should be pushed into the background in view of the imminent damage possibilities and expenses in the "event of a case". ----------------------------- Best regards: KlaRa