Waterproofing shower in a shed

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Hello everyone,

I am in the process of building a small timber shed that has water and sewage connections. It’s primarily for occasional weekend use, but I want to make sure it’s properly waterproofed.
The shed is constructed from timber and insulated with XPS. Since I’m in Germany, where concrete construction is the norm, I thought this forum would be a great place to get advice on waterproofing a timber structure.

Here’s the plan:
  • The floor and walls of the shower area are made from OSB and gypsum plastic boards.
  • I plan to waterproof these surfaces using "Flüssigfolie" (a liquid waterproofing membrane applied with a brush) and special sealing strips for the edges.
  • After that, I’ll glue vinyl material over the surfaces for additional water resistance.

While I understand vinyl may not provide complete waterproofing, the underlying waterproof layer should handle the job. However, I’m uncertain about the best, affordable materials to use for this application or if there are better methods I should consider.
I’ve attached a sketch of the project and would greatly appreciate any suggestions or feedback you might have.


Thanks in advance for your help!
 

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