ᐅ Drain pipe should not be installed beneath the screed (cement floor layer).

There can be no valid reason in the case of new construction.

A drain pipe in the kitchen is usually about 40-60mm (1.5-2.5 inches) in diameter.
The heated screed is at least 6cm (2.5 inches) thick, with insulation and impact sound insulation underneath. On the ground floor, it is over 6cm (2.5 inches), sometimes significantly thicker if there is no insulation under the floor slab.
Therefore, the drain pipe is usually not embedded in the screed but placed in the insulation layer below.
Very strange.

Unfortunately, I can’t find a better photo at the moment, but you can see a little. This is how it looks at a colleague’s place upstairs in the bathroom. Since the pipe diameter is too large and the slope needs to be maintained, about 4–5cm (1.5–2 inches) was chiselled away from the ceiling.

Hello

When embedding into the concrete, someone here will surely point out potential structural issues. As executed, it’s not ideal but certainly not a technical disadvantage. Also, the screed cannot be weakened where it isn’t present.

The only real problem that might arise with this setup is that connections extend too far into the base cabinet under the sink, possibly interfering with any installations.

Has the builder provided the plumber with a kitchen plan?


Olli

Um... have you noticed that the water pipes haven’t been covered with plaster, even though the interior walls are already fully plastered?
So, the screed isn’t your only problem.

This is the first time I’ve seen the piping (hot and cold water) not embedded in plaster. Is this the new standard practice now?

tomtom79 schrieb:

There can be no valid reason for a new build.

First, listen carefully – just because you can’t think of a valid reason doesn’t mean there isn’t one. Several come to mind, for example, a late design change requested by the client.