Shower tray or tile drain?

The shower element to be supplied with water is quite thick. Even if I completely chisel out the screed, it still won't align with the floor level. Is there perhaps a type of film that can be placed under the tile adhesive as a precaution?

If no pre-sloped shower element is used, then a normal sloped screed is installed, which is then waterproofed multiple times. I am currently having this done in my home. The underfloor heating is also embedded in my screed. The screed layer has already been laid with a slight slope towards the central drain by the screed installer. A waterproof coating was applied on top of that. Today, an additional fleece (I have no idea what it’s exactly called, I can check at home if needed) was installed, which was glued over the entire surface and at the same time serves as decoupling because of the underfloor heating. The connections to the drain must, of course, be worked on carefully. Tiling will then be done on top with the corresponding slope and miter cuts because my floor tiles measuring 30x60 are too large to create the slope in four directions without cuts. With mosaic tiles, it might look a bit different, but I wanted to have as few joints as possible. I had to refrain from a wall drain channel; my maximum build-up height of 8-10 cm was not sufficient to properly form the necessary slope (the shower will be about 150 cm long).

If you don't use a flowable shower element, a normal sloped screed is installed, which is then sealed multiple times. I'm currently having this done in my place. The underfloor heating is also installed in the screed. The screed layerer has already laid the screed with a slight slope towards the central drain. A sealing coat was then applied on top. Today, an additional fleece (no idea what it's exactly called, I can check at home if needed) was installed, which was fully glued on and at the same time serves as decoupling because of the underfloor heating. The connections to the drain must, of course, be worked on carefully. Tiles will then be laid on top with the corresponding slope and miter cuts because my floor tiles measuring 30x60 are too large to execute the slope in four directions without cuts. For mosaic tiles, this might look a bit different, but I wanted to have as few joints as possible. I had to refrain from a wall drain channel because my maximum build-up height of 8-10 cm was not enough to properly form the necessary slope (the shower will be about 150 cm long).

Hi Frank. Please ask your installer/tiler about the fleece and what kind of sealing coat he is using. I will probably have to do all of this myself. I have laid tiles several times before (and learned from it ops ), but a level-access shower has not been included yet, and who wants water damage in the house.

The fleece is called Botament sealing and decoupling membrane. I just googled the name and found the manufacturer's site. In any case, there was also an edge seal that was glued all around the joint between the screed and the wall and incorporated there. I suspect it was the matching Botament SB 78 system sealing tape. Just search for the manufacturer, you'll find more products there. I know that some products from Sopro were also used with me (tile adhesive, primer or adhesion promoter, etc.), but where exactly what was used, I don't know. I'm not an expert and have to rely on my craftsmen.

Before you do the self-build, I would advise you to consult a specialist retailer in the building trade. There you can also buy the appropriate products; you are less likely to find them at a hardware store (maybe there are similar ones there, but is the advice that good?).