Replacing sink with shower, problems with drain

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  #1  
Old 10-27-13, 03:18 PM
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Replacing sink with shower, problems with drain

Hi, I am trying to install a shower into what was a half bathroom. It had a sink, a toilet and a closet. I have removed the closet that was next to the toilet and will install a sink there. Where the sink was I am putting in shower. I have a couple of problems that I am not sure of the answer to maybe some one here can help me. Firstly I need to put in a drain for the shower. I am assuming that the sewer line runs from the vent to the toilet to the sink drain and then on under the house to where it goes. I was going to cut into the concrete floor to hit the drain perpendicularly and splice in a tee ( 3" or 4" to 2" show drain). Is this the right thing to do?
Secondly the sink is fed by black metal pipes coming down from the ceiling. I would love to just install a couple of right angles to take the pipes back up to the correct level. I suspect this is too easy and would lead to air locks and I really ought to cut a tee into the existing down pipes.

Overall view
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Inside the wall with the metal pipes
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The toilet drain and vent
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The existing sink drain
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I can cut the metal pipes. How do I tap the ends?

Many thanks in advance

Robert
 
  #2  
Old 10-27-13, 03:26 PM
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Now that you have the wall open you should get rid of that galvanized steel piping. Replace it with PEX now or you WILL have trouble down the road.
 
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Old 10-27-13, 03:27 PM
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Welcome to the forums! A sink drain is most likely 1 1/2" in diameter. A shower must have a 2" drain. So you will need to figure how to tie the shower to a 2" drain. If the drain is actually 2", then you can cut your concrete and move the drain, capping the "y" that presently goes to the sink and leave the vent in place. Let us know the size of the sink drain.
 
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Old 10-27-13, 03:54 PM
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The sink is 1 1/2". I'm guessing that when I cut through the concrete I'll find the main drain which is probably 3". Will it be plastic or cast iron? The house was built in about 1975.
 
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Old 10-27-13, 04:07 PM
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This is what you will need to do... I hope you understand this drawing...



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Old 10-27-13, 04:15 PM
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I am only exposing 10 feet or so of existing metal piping. I'm not going to rip out all the existing metal to install plex. Why will I have problems down the road?
 
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Old 10-27-13, 04:26 PM
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Galvanized supply lines are notorious for liming over and closing up after years of use, and hard water, etc. If you aren't experiencing reduced flow yet, you may in a few years. You will be moving or abandoning them anyway, why not go with pex? I am certain they are not in the ideal spot for a shower valve.
 
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Old 10-27-13, 04:52 PM
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Hi Lawrosa, I didn't really understand your sketch. I was thinking something like:Name:  bathroom-1.png
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