I installed a sink and shower right next to each other. The flooring is not yet in. The sink goes in one side of a T the shower the other side and the third side of the T goes to the main Drain. When I drain the sink it backs up into the shower. How do I stop this. There is a trap under the shower - I thought that would prevent this - I guess I was wrong - luckily I used plastic pipe. Anyone know where I can get a diagram of the proper setup.

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Originally Posted by Art Machado

I installed a sink and shower right next to each other. The flooring is not yet in. The sink goes in one side of a T the shower the other side and the third side of the T goes to the main Drain. When I drain the sink it backs up into the shower. How do I stop this. There is a trap under the shower - I thought that would prevent this - I guess I was wrong - luckily I used plastic pipe. Anyone know where I can get a diagram of the proper setup.

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Hey Art,
What you have done is drain your sink which is higher directly into the shower which is lower. What did you think would happen? A trap just protects the fixture from escaping sewer gas. It is not a check valve or a backflow preventer.
If you can scan and send me a drawing of your fixture layout and the sewer main that you're connecting to I'll lay it out and fill in the dots for you.
Regards, Tom