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Does a waste line connecting to sewer line have to be underground?

Discussion in 'Plumbing Codes' started by SJP415, Aug 19, 2018.

  1. SJP415

    SJP415 Registered User

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    Hi all - we are about to start a project where we are converting our detached garage into a mother-in-law unit and adding a new bathroom with a shower, sink and toilet in it. The new bathroom will need to connect to the main sewer line and have a waste line/drain line (not sure what the right terminology is here sorry - I'm talking about the new pipe line that connects the new toilet to the main sewer line). The question is does this new line that will connect to the main sewer line have to be buried underground? We have gotten conflicting information from two plumbers: one said no it can just run under our deck as long as it has the right slope and it's not exposed to the sun; the other said it had to be underground and we would have to dig a trench. We live in San Diego so no frost worries here. It would cost a lot more to have to put it underground so just wondering if anyone knows if there is a code requirement that says it has to go underground? We can easily hide it under our deck to keep it away from sun exposure. Thank you!
     
  2. mark handler

    mark handler Sawhorse

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    It needs to be protected, and uniformity supported. It also needs to have accessable cleanouts and have proper slope.
     
    #2 mark handler, Aug 19, 2018
    Last edited: Aug 21, 2018
  3. cda

    cda Sawhorse

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    Interesting no burial required?

    Try an anonymous call to the city to check also.
     
    JBI likes this.
  4. ICE

    ICE Sawhorse

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    On the topic of protection: I was told that the only ABS that is allowed to be exposed to sunlight is that bit above the roof. That bit must be painted. All other, including cleanouts, is not allowed to be exposed to sunlight with or without paint.

    That was at a ICC accredited training class. When I questioned that I was informed that the manufacturer's installation instructions require it.

    Then I found this:
    312.13 Exposed ABS Piping. ABS piping shall not be exposed to direct sunlight.
    Exception: ABS piping exposed to sunlight that is protected by water based synthetic latex paints.
     
    #4 ICE, Aug 19, 2018
    Last edited: Aug 19, 2018
  5. north star

    north star Sawhorse

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    % * %

    Maybe we should clarify exactly what type of pipe
    **SJP415** is referring to.......ABS, ...PVC,

    or something else.

    Also, ...the 2016 CPC, Section 312.3 requires a minimum of
    12 inches depth of the building sewer.


    % * %
     
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  6. mark handler

    mark handler Sawhorse

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    That section says "..materials other than those approved for use ..."
    If the material are approved, they donot need to be 12-inches below.

    How many raised floor houses havd you seen with the sewer line strapped to the underside of the joists, not buried 12-inches below grade.
    Most sewer under slabs or in structures are not 12 to 24 inches below the slab..
     
    #6 mark handler, Aug 20, 2018
    Last edited: Aug 21, 2018
  7. north star

    north star Sawhorse

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    % = %

    Thank you for the correction Mark ! ;)

    % = %
     
  8. Keystone

    Keystone Sawhorse

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    Charolette Pipe allows non pressure schedule 40 PVC to be installed exposed to direct sunlight if the pipe covered with water based latex paint
     
  9. JBI

    JBI Sawhorse

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    Within the building it is a building drain NOT a building sewer line... the building drain is not exposed to direct sunlight.
     
    mark handler likes this.
  10. mark handler

    mark handler Sawhorse

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    Read the original post
    Same thing, it does not need to be underground.
     
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  11. JBI

    JBI Sawhorse

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    mark, we can agree to disagree I suppose...
     

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