Is sealing of a drain fitting necessary?

  • Erstellt am 2023-09-26 13:36:45

Finch039

2023-09-26 13:36:45
  • #1
Hello everyone,

During the renovation of our old house from 1927, the bathroom is currently being done.
We have relocated it to the upper floor; the bathroom will be on a wooden beam ceiling (Holzbalkendecke, Schüttung, wood fiber insulation board, Rigidur dry screed).

Now it's about installing the shower tray. The installation situation is somewhat complicated; a corresponding hole was left in the floor for the installation of the drain pipes and the drain fitting. The drain fitting will be positioned between the beams in the wooden beam ceiling, so that the shower tray can be placed on the finished floor.

However, I am now concerned that over time the drain fitting might leak and water could run unnoticed into the wooden beam ceiling, causing it to start rotting. I asked the plumber whether some kind of additional sealing or protection would be possible. He said no and that the drain fittings are very reliable and usually do not leak. Is that really the case? Unfortunately, I have gradually lost trust in some craftsmen.

Furthermore, he wants to set the marble polymer shower tray directly on the finished floor (i.e., dry screed) in tile adhesive. Is that really common?
The floor is exposed to certain vibrations, and I doubt that this approach ensures long-term stability...

I am currently a bit unsure because the plumber and the tiler are clashing, and the latter basically questions almost everything the plumber does, and as a layperson, I can mostly only judge this with difficulty.
 

OBM München

2023-10-05 23:47:35
  • #2


Nothing is 100% certain, but...
After 25 years of experience and over 200 renovated bathrooms ... tip:

1. Underneath the shower tray 2K insulation like PCI Seccoral (floor + walls) including sealing tape and sealing corner
2. High-quality siphon like Viega Tempoplex
3. The shower tray can be glued with tile adhesive. We do that as well.
 

Similar topics
08.08.2015Insulation wooden beam ceiling10
08.12.2014Floor-level shower tiled with channels or with a shower tray?12
07.09.2017Floor slab: Concrete or wooden beam ceiling - Advantages and disadvantages!?20
09.02.2016Wood beam ceiling vs. concrete ceiling16
15.12.2016Shower tray or tiled shower?24
19.11.2017Underfloor heating on wooden beam ceiling12
15.08.2017Calculation interior finishing: heating, sanitary, bathrooms, floor coverings55
01.09.2018Offer for heating / sanitary / ventilation - is it realistic?55
10.10.2018General Contractor Offer - Heating + Sanitary = OK?16
18.01.2019Prefabricated house is leaking. We feel cheated30
02.08.2019Costs for plumbing & heat pump31
22.04.2021Costs for the heating & sanitary trade86
23.11.2020Sanitary offer - realistic & reasonable?37
19.03.2021Flat roof leaking, repair or build a roof structure over it?24
27.03.2015Toilet flush tank leaking10
31.01.2022Heating and Sanitary Offers Assessment17
18.07.2022On which surface should the shower tray be placed?11
17.01.2023Fixed glazing plastic window is leaking45
29.09.2023Additional sanitary costs - labor and material costs13
20.09.2024New construction - Costs of plumbing & heating experiences?15

Oben