Styrofoam under screed and underfloor heating - What is the name of the product?

Eps ist jedoch Dämmung

Of course. But read again what he is looking for. He wants to put Styrofoam ON the heating pipes.

Hello, this is for the shower in the attic.

The builder had left out the screed in the shower area for a shower tray.

Now there will be a walk-in shower.
Screed will be applied in that area.
There is underfloor heating in the shower.

What exactly goes there now? Do you have an exact designation?

Find someone who knows what they are doing. I can already see water damage because it was done poorly. Especially if it already fails at how the structure is supposed to be.

Just ask the installer of your property developer! You won’t get any more tips from me because I don’t want to be blamed if something goes wrong.

I don't want to hold you to that. The developer wanted to install a shower tray, but the tray arrived defective. We then canceled the shower tray so the tiler could continue. The developer and his plumber say nothing because we had to cancel the shower tray. That is why I am asking here in the group, because I need help and have to continue.

My goodness. Last tip from me: the tiler normally does the sloped screed in the shower, likewise he insulates and must permanently seal it against moisture and water.

Now you can contact your Ansprechpartner.