Building approval advice for kitchen drain

Discussion in 'Plumbers' Talk' started by DarrenD, Oct 9, 2019.

  1. DarrenD

    DarrenD New Member

    Hi All
    We currently have our new 40mm kitchen sink waste pipe going under a suspended floor and connecting directly into the main 110mm drain (that then goes to the sewer). This length of 40mm pipe is less than 1.5meters to the main waste pipe.
    We have been told by building approval that our 40mm kitchen sink drain needs to connect into the 110mm wastepipe at floor level (not under the floor). The suspended floor is about 50cm off the ground.
    We can't find anything in the Part H building regs that says this is necessary. Any advice would be much appreciated!
  2. KIAB

    KIAB Super Member

    Nothing in Building Reg H, as far as I can recall, but Polypipe have this in their installation guide, page 37.

    Clearly the waste pipe connection would below floor level whether it's suspended or solid,if you at image below.
    If we say centre of back inlet is 150mm from top of gully, then add for dpc level 150mm (floor level approx) you get 300mm.

    Last edited: Oct 9, 2019

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