• Depends on how the soil pipe runs under your flooring.
    If you follow 1:40 drop, then its 25mm every metre, and 5m length (I imagine it would be less than this) would be 125mm.

    You should be ok I would think?

  • Oh, great! For some reason I thought the drop had to be considerably steeper, thanks!

    The floors en route to outside will be coming up as they all old (90s) cracked tiles so hopefully enough space in the void below.

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