Frost apron vs. founding cushion

Thank you for the feedback. In my case, only 50cm of soil cushion is actually required in the geotechnical report; I reused the thread because it was thematically relevant (see Post #7). The geotechnical report indeed refers to floodplain clay and valley clay as the subsoil at the foundation depth (depending on which of the two boreholes). In terms of consistency, I would not describe it as mushy or soft, rather quite stiff – if the geotechnical engineer gives the go-ahead over the phone tomorrow for the frost protection layer made of frost protection gravel and we end up 1m below the GOK, then we would also immediately apply the gravel.

Thanks also for your note regarding the processing! I don’t know if the foundation contractor is familiar with that, but it can’t hurt if I mention it :)

That the first post was not from you at all, I only noticed afterwards, but the rest of the answer still fit ;) In general, everyone who works with floors for a longer time should know that (ok maybe not everywhere in the North, but from Hannover southwards). Unfortunately, I keep seeing that such things are often ignored because they make the work more demanding and inevitably more structured.