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Large height difference in concrete bathroom floor

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  1. #1
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    Default Large height difference in concrete bathroom floor

    I have removed the floor and internal cladding of a bathroom to allow replacement of all drain and water pipes. It's a timber frame on bricks with (removed) concrete floor.


    I've discovered that the highest point of the bricks under the baseplate is about 80 mm higher than the lowest point. The red line in the picture shows height of highest point.

    height.jpg

    Previously, there was a cast iron bath in this corner with no floor beneath.


    Thus when the concrete is poured, I think I have at least one of the following problems.
    1. The concrete is poured up to the lowest point of the bricks, and there is a height difference that requires a very thick, sloping screed.
    2. The concrete is poured up to the lowest point of the bricks, and the bricks protrude inside of the plasterboards
    3. The concrete is poured higher the top of some bricks, in which case concrete is above the bottom of (and possibly above the top of) the baseplate.


    Does anyone have any suggestions on how to deal with this?
    Attached Thumbnails Attached Thumbnails height-1-.jpg  

  2. #2
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    Screw a strip of compressed cement sheet to the baseplate...it'll act as form work.
    Joined RF in 2006...Resigned in 2020.

  3. #3
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    Thank you for that advice.

    Id be using cement board for the wall panels. So I guess I could potentially put in a strip above the bricks, and horizontal join more cement board above once concrete is in.

    Could I even put the wall panels in before the concrete, or is that crazy?

  4. #4
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    Quote Originally Posted by EvilOverlord View Post
    Thank you for that advice.

    I’d be using cement board for the wall panels. So I guess I could potentially put in a strip above the bricks, and horizontal join more cement board above once concrete is in.

    Could I even put the wall panels in before the concrete, or is that crazy?
    SBD I'm sure will rely back, but he used "compressed cement sheet" - I'd consider that as different to lightweight villa board (for walls) - something like 15mm off cuts or scyon floor sheet off cuts

  5. #5
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    Thanks.
    Also, I presume the idea to leave the 15mm sheet in permanently? What might I do where the 15mm sheet meets the wall board?

  6. #6
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    Quote Originally Posted by EvilOverlord View Post
    I presume the idea to leave the 15mm sheet in permanently? What might I do where the 15mm sheet meets the wall board?
    Yes. The 15 mm sheet need only be as tall as the concrete...so the top of it will be part of the floor. Which means no worries about the FC wall board joining it.
    Joined RF in 2006...Resigned in 2020.

  7. #7
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    Thanks for the replies, much appreciated.

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