Wet Room Floor

How is a wet room floor constructed ?
We are currently half way through a build/extension and they are screeding today
They have about 3 cm of thickness to fill - (plus vinyl) - to bring it up to the door theshold level.
So how do they get a sloped (in both directions) surface to a drain ?
There doesn't seem enough "depth" !!

Comments

  • Glad
    Glad Posts: 18,864
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    Have you asked the company who are doing the work for you?
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  • Glad said:
    Have you asked the company who are doing the work for you?
    I just wondered how it was done 
  • tacpot12
    tacpot12 Posts: 7,834
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    Wetrooms don't usually have a fall across the whole room (unless they are particularly small). The fall for drainage is usually limited to the area where you will shower. In that area, the fall should be between 1:35 and 1:80. So a 1m shower area will need a fall of at least 12.5mm over its full length (1000 / 80). If the drain is centrally located, this will be halved (so 6mm). So 30mm is plenty. 

    I'd expect most installers to use pre-formed shower trays to set this fall, and to overboard with plywood boards across the rest of the room.

    So the floor makeup (assuming the subfloor is wood) will probably be:
    - Vinyl sheet
    - Pre-formed shower tray / plywood
    - Self-leveling compound  
    - Subfloor

    You might like to take a look at this: The Practical Guide To Wetroom Specification PDF.pdf (biid.org.uk)
    Just be aware that the company that produced it sells materials for wetrooms, so they are not independent.
    The comments I post are my personal opinion. While I try to check everything is correct before posting, I can and do make mistakes, so always try to check official information sources before relying on my posts.
  • Bigphil1474
    Bigphil1474 Posts: 2,254
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    They don't need much of a gradient about half an inch I think.
  • tacpot12 said:
    Wetrooms don't usually have a fall across the whole room (unless they are particularly small). The fall for drainage is usually limited to the area where you will shower. In that area, the fall should be between 1:35 and 1:80. So a 1m shower area will need a fall of at least 12.5mm over its full length (1000 / 80). If the drain is centrally located, this will be halved (so 6mm). So 30mm is plenty. 

    I'd expect most installers to use pre-formed shower trays to set this fall, and to overboard with plywood boards across the rest of the room.

    So the floor makeup (assuming the subfloor is wood) will probably be:
    - Vinyl sheet
    - Pre-formed shower tray / plywood
    - Self-leveling compound  
    - Subfloor

    You might like to take a look at this: The Practical Guide To Wetroom Specification PDF.pdf (biid.org.uk)
    Just be aware that the company that produced it sells materials for wetrooms, so they are not independent.
    No shower tray and the room is 3 metres by 1.5 metres
  • Should a newly screed floor be kept dry or does it not really matter if it rains on it (through open doorway/windows ?)
  • stuart45
    stuart45 Posts: 3,799
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    If it's a traditional sand/cement screed it's worth covering it with polythene to stop it drying out too quickly.
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