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There is a main drain that runs from the basement through the roof where it is the vent for the system. If you look at the layout of the house, the upstairs bath is most likely over the downstairs one or the kitchen. If you look on the roof, you will see a 4 inch pipe coming through the roof that should be over the upstairs bath. The sink and shower drain into that and then to the basement and out of the house. Most likely the main stack is in the wall behind the toilet.

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Q: Where does upstairs sink water and shower water drain to?
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Why does a ground level kitchen sink back up when the upstairs shower is turned on?

There is a clog between the sink and the line to the street or septic tank. The sink is the easier path for the upstairs shower.


Why would upstairs sink have water coming UP through the drain?

A blocked pipe. The water can not go down the pipe, so it comes out in your sink.


Will not having a drain pipe from sink and shower pipes to outsides drainage pipes have any connections to sewer problems you are having?

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Why would your bathroom shower begin to flood everytime you use your upstairs shower or sink?

The shower drain and waste lines on up to the other fixtures located above need to be clear so that water will flow. Just downhill of the shower drain there is probably a blockage in the waste pipe. The blockage could cause slow draining. If it is completely blocked, the shower pan will not drain back out over time. You will need to run a plumbers snake down the line below the shower drain. If the toilet in the same room as the shower when flushed also shows water coming into the shower drain, it will be best to take up the toilet off the base and run a plumbers snake from that point. Warning for very slow draining lines or lines that do not drain, DO NOT use Drain cleaning chemicals. Good luck and you may wish to call rotorooter.


Kitchen sink gurgles when upstairs toilet is flushed?

You have a blockage in your main sewerline. You have a problem with your venting system. This is why some codes now require a vent within 6" of the toilet. If you will add a vvent to your main line at the toilet you will stop this. Check to make sure your vents are not clogged by a bird or bees nest first.


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How can one improve water flow to a shower?

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When using the kitchen sink why does the water in the shower upstairs go hot or cold?

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How do you stop water from coming up a basement sink drain when the toilet is flushed upstairs?

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What would cause kitchen sink drain to gurgling when shower is running?

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