Locating Main Line Under Concrete Slab

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    • #284538
      spd01

      We are planning a remodel to make a new master bedroom suite out of two existing bedrooms on the lower level of our split-foyer raised ranch style home. To tie in the new drain lines for the added bathroom, we will need to first locate the main line under the concrete slab. We want to keep the concrete removal to a minimum. What is the best way to locate the main lines approximate location before we just start sawing? The pipe is probably PVC under 4-6 inches of concrete containing steel re-bar or mesh. Based on the positions of the exisiting lower level bathroom and the septic tank, it could be anywhere along a 12 foot length of the exerior wall.


      | |Existing | | | | Bath | | |


      | | | |


      | | | New Master | | |New Bedroom | | |Bath |



      |Septic| |Tank |


    • #302965
      J. Hendy-Kline
      Participant

      we will need to first locate the main line under the concrete slab. What is the best way to locate the main lines approximate location before we startI would guess that it would that the waste drain would be between the toilet of the lower level bath and the septic tank. Most septic tanks are placed in line with the waste stub from the house. Another method would be to use two wires bent in a L shape to witch the line. Cut a wire coat hanger into two pieces. Make one end of the bend about 4 and the long end of the L 6 long. Hold the short end of the wire in the palm of each hand with the long part above your hand. While walking across a pipe, the wires should cross and point toward each other. You can try this with metal or plastic pipe, buried or just sitting on the ground. American home Leak Detectors may also be able to help, their web site ULR is located on my FAQ page at http://www.terrylove.com/faq.htmRegards, Terry Love

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