ᐅ Waterproofing shower walls and floors in a single step? According to DIN 18534

Hello,
here is my question directly:
In a bathroom—specifically in the shower—does the waterproofing of walls and floor need to be done in one continuous process?

Our situation:
The house handover is in two weeks, and currently all the wall tiles are installed, but the floor tiles are not laid yet.
Our inspector noted this as a defect and instructed that all the tiles be removed, the waterproofing of walls and floor be applied in one continuous step (plus documentation), and then the tiles be reinstalled.
The builder now wants to remove only the bottom row of tiles and apply the waterproofing from there.

Summary:
Can we refuse the handover if it is not done according to the inspector’s recommendation?
What does the standard say? Do we have to accept the builder’s “quick fix”?

Thank you very much for your advice.
Regards,
simon

I’m not familiar with the DIN standards, but logically, you can’t properly apply liquid waterproofing like that. How was it supposed to work? Masking off the bottom tile and then using a thin brush to apply a thick and continuous layer of liquid waterproofing to the gap between the tile and the floor?

I'll join in here.
This is about a general contractor, but which trade is responsible for waterproofing the shower area? Is it the plumbing trade or the tiling trade?
It would be interesting to know, especially when it comes to individual contracts and/or self-performance.

So, who usually takes care of the waterproofing? Or is it all a matter of negotiation?

Tolentino schrieb:

I’m joining in here.
This is about a general contractor, but which trade is responsible for waterproofing the shower area? Is it the plumbing trade or the tiling trade?
It would be interesting to know, especially when it comes to subcontracting individual trades and/or doing some work yourself.

So, who usually takes care of the waterproofing? Or is that all negotiable?

The general contractor builds the house and subcontracts the interior finishing to various trades. I don’t know exactly who is responsible for what, but for us only the general contractor matters, since we take over the house from them in the end. That’s why it’s important for us to know whether we can insist that the waterproofing is done completely new and properly? (Whoever is responsible for that and covers the costs—that’s something the contractor has to sort out.)

Obviously, this is not important to you. I did not direct this related question to you specifically, but I hope that someone else who is knowledgeable and able to assist you can also answer my question...

In our case, the tiler was responsible for the waterproofing. This was also applied as a single continuous layer.