Lowering of the floor on the ground floor and upper floor

Hello,

it is about the fact that the floors in all rooms have sunk, causing cracks to form between the floor tiles and the baseboard tiles. We had an underfloor heating system (geothermal) installed. Who has experience or explanations about this?

A message to the construction company only resulted in a letter stating that these are expansion joints/maintenance joints and are the responsibility of the homeowner.

Goodbye Alberthafen

Is it possible that the flow temperature of the floor height is too high?

As far as I know, depending on the floor construction, 50 °C should not be exceeded. Do you have a proper separate control circuit for the floor height or is it connected to a return temperature limiter?

Regards

The cupping of a cement screed results from rapid drying of the screed over the large surface area and because cement screed shrinks up to 10 times more during hardening than a calcium sulfate screed. The drying screed shortens at the top while the still not dried bottom of the screed remains at the original length. The cement screed deforms upwards at the corners, is usually then covered, and with further drying (usually after 2 years) the edge joints crack due to re-deformation of the cement screed caused by drying of the underside.

This effect is greater the earlier a cement screed is ventilated. Therefore, screeds that can be covered early are also more susceptible to this cupping. Calcium sulfate screeds do not shrink and are therefore insensitive to early ventilation – on the contrary, they dry out much faster because of it.

Unfortunately, we have the same problem; on the ground floor, the floor is lowered, and as a result, we have joint cracks; however, this was already communicated to us in advance by the construction company that this could happen, and on the upper floor, we have cracks in the ceiling, which were promptly repaired by the site manager. Now I am also considering how we can easily clean the joints again because unfortunately, we will not be able to avoid regrouting... it looks very unsightly.