Building a House – #09 Underground Plumbing

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How an underground drain line is installed during new construction. I don’t show the actual installation as it is done the same as in wall pipe. The goal here is to show how the pipe is laid out and prepared for inspection.

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  1. It's a huge problem with the shower drain joining the toilet drain horizontally, a portion of toilet waste will overflow into the shower drain. While I'm plumbing my house, I opted to have the shower drain coming into waste drain from above. I don't live in US, so I'm glad not bounding by your country's code

  2. I've been in the plumbing/pipefitting business for 43 years. I see 3 corrections there. The 2" should be 3" with a full size clean out. The trap arm for the lavy can only be 3'-6" on 1-1/2" otherwise it has to be 2" at 5'-0". Also the floor drain needs a separate vent. In a basement system you'll need a backwater valve to provent flooding.

  3. Question. What are you going to do if there is a clog down stream of the toilet. Pull your toilet and flood your floor with poo-poup. UPC code specifies a mainline clean- out.
    Correction: a Quarter bubble on a torpedo level is not quarter inch per foot.

  4. Thanks for this video it answer an outstanding question I had about my rough ins for a bathroom in my basement. I thought I had to break up the concrete to add a drain for the sink vanity, you explained it at around 2:19. My rough in has the 3 same pipes coming up through the concrete. Thanks.

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