Underfloor heating and screed covering and distances

I am just wondering if there are minimum distances to the side for screed and underfloor heating pipes as well? It is clear that a minimum screed coverage of the pipe must be ensured, but what about the sides of the pipe?

From our technical room, where the heating circuit distributor is also located, many pipes come out in the area of the door, which then run through the hallway in the house and lie very close together, sometimes with hardly any or only a few millimeters of distance.

Is it okay if there is enough screed on the pipes, or must there also be a lot of space between the pipes laterally (cm or so?) so that a correspondingly large amount of screed can flow in there?

Hello lesmue, in general, the heating pipes should already be enclosed, since the heating effect arises from the contact of the pipe with the screed. However, if it cannot be solved otherwise, it should be limited to a minimal distance. But under no circumstances reduce the minimum coverage. Have you ever thought about running some pipes on the floor through the wall? This breakthrough is later under the screed and not visible.