pvc under slab

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    • #279378
      Avatar photoDavid Munro

        I have 3 questions. I am installing a sink only drain in a garage to a cesspool system. I am placing it under the slab and core drilling through the foundation block. My first question is do i need a sleeve through the concrete block? my next question is can the pipe exit upward through the slab poured in the concrete or do I need a sleeve here also? My third question, is 2.5 inch pipe large enough or is there a minimum size required.
        thanks for any help.

      • #300699
        Avatar photoRetired plbg1
        Participant

          2″ is ok as long as your code goes along with it. After you get outside use 3′ pipe to cesspool and put a CO. every 50′. Also run a vent through the roof. Check your code for vent size here you could use 1-1/2″ up to 18″ below roof and increase it to 2″ through roof.

        • #300700
          Avatar photoRetired plbg1
          Participant

            Its always good to put sleeve in wall and them waterproof around it, our codes lets you run 10′ 2′ underground, you dont need slleve in floor.

          • #300701
            Avatar photopfelmey
            Participant

              Thanks for the help!!!!

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