Hello
I have read your initial post[/B] and would like to confirm your suspicion ("I am slowly getting the feeling he doesn’t know what he’s talking about ...").
Anyone who heats up at 1K/day without caution undoubtedly does not know the relevant recommendations of the BVF (which is the Federal Association for Surface Heating and Surface Cooling e.V.). Because that is nonsensical, as the screed can relieve its tensions through gradual heating up to the maximum temperature.
The recommendations listed there currently represent the state of the art.
According to them (for cement screeds) after 21 days or (for calcium sulfate screeds) after 7 days, the heating is gradually increased to the maximum design temperature, this flow temperature is maintained for 4 days, and then gradually reduced at 10K/day. At 40°C, that would be less than 1 week of waiting time.
After this, the functional heating is complete, it is left at room temperature for 2 days until the final heating for readiness takes place.
This no longer involves gradual heating; the heating system is immediately brought up to the maximum design temperature.
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As for the "harmless text passage".
That heating elements detach from the carrier plate or float up must definitely be prevented during the installation of the underfloor heating elements. Now, it has not only happened visibly but it is also uncertain whether the other heating elements actually still have the necessary screed coverage of 45 mm.
This means initially: your concerns are justified.
But furthermore: simply knocking open the visible part and lowering it – NO!
I have been professionally dealing with such and similar issues for over 30 years now.
But to simply ignore the danger and shift it onto you (as the builder) – I definitely would not accept that.
Okay, YOU have a warranty period, usually 5 years. But what use is that to you if the warm water elements cease to function (to put it politely) after 2 or 3 years?
After that, testing and possibly repairs in a fully furnished room are only possible with considerable effort (for you/your family).
I advise you to immediately engage a publicly appointed and sworn expert for the trade "floor construction" before taking any further measures.
You can obtain addresses through, for example, the "Expertise" department of your Chamber of Industry and Commerce.
Because what is emerging here, I know from my own practice, where the young builder, it was his first construction project, recorded with a camcorder: the flowing screed came from the feed hose laid over the shoulder of the installer at about 1.60 m height onto the floor and tore off the heating elements, which, like a hydra that sticks its heads here and there out of the water (here: from the flowing mass), lowers them again, and reappears elsewhere. The contractor’s then argument was: No problem, it will be skimmed over!
No, everything was completely torn out again, including the heating elements together with the damaged carrier plates; and was afterwards professionally and properly replaced by a new construction corresponding to the state of the art with great effort, albeit still in the uninhabited building.
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Regards and the wish for a decisive action: KlaRa