Main sewer line depth

Discussion in 'Canadian Plumbing Code Questions' started by diganddig, Apr 27, 2012.

  1. diganddig

    diganddig New Member

    Apr 27, 2012
    Calgary Alberta Canada

    I'm in Calgary Alberta and I need to replace my sewer line from the house to the property line. Current plan is to abandon the old line and trench in a new one. I'll break the basement floor and tie into the existing stack.

    How deep does the sewer from the house to the property line have to run - I'm guessing 6'.

    What about the portion under my basement floor? Can it go straight down 4' from the basement floor and then head out from there. It will be 9' deep outside the house but only 4' below the basement slab. Is that okay?

    What pitch should I shoot for - is 1/4" to 1/2" per foot about right. Is it better to add a vertical drop than to exceed the 1/2" per foot.

    Where can I get a look at applicable plumbing code to make sure I do this right? I will be getting it inspected, but I want to know what I'm doing before putting too much effort into the trench.

    Thanks for your time!
    Last edited: Apr 27, 2012
  2. diganddig

    diganddig New Member

    Apr 27, 2012
    Calgary Alberta Canada
    According to a city inspector, a Calgary sewer can be a minimum of 4' from the surface provided that a proper frost box is installed.

    Next question - what's a frost box?
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  4. Plumber1979

    Plumber1979 Certified Plumber

    Jul 15, 2012
    Certified Plumber
    you better check on the depth to the sewer in the street before you decide to do anything
  5. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    Plumber 1979, are you suggesting that sewage doesn't run uphill in Canada!
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