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Old 07-11-2012, 03:48 AM   #1
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Drain shower into existing toilet drain


Hi all,
This is my first post and I've been cruising the archives for a while. Seems as though there are some very helpful members here. I hope someone can answer this question.
I have a bathroom that had three toilets in it and I want to drain a shower into one of them. This is on a concrete floor.
Problems I'm facing(that I can see) :

1. I have to break the concrete and dig down to install a p trap
2. I have to use all cast iron pipe if it will be covered by concrete?
3. I will have to fill gravel in to the bottom level of the concrete slab and then re-cement in the hole to the top

I'm not sure exactly what venting is required on a shower and how it would be done properly with a shower or if it exists already. Any help/suggestions are much appreciated.

Thanks

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Old 07-11-2012, 05:36 AM   #2
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Drain shower into existing toilet drain


A toilet ,if installed properly, has a vent already----


the cast iron will have gravel over it under the slab---

2" P-trap and pipe is needed to hook up a shower---

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Old 07-12-2012, 05:18 PM   #3
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Drain shower into existing toilet drain


K. Sounds like im on the right track then. So how can I plumb it down to two inch. Will I cut the cast iron pipe deep in the slab and then use PVC the rest of the way, or use cast iron the whole way? Also my idea for getting through the concrete was to use a rotary hammer drill to mark my lines, and then use a jack hammer to get through the slab, hopefully reducing the risk of cracking the entire slab with the jackhammer. Angle grinder to get through the rebar.
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Old 07-12-2012, 06:22 PM   #4
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Drain shower into existing toilet drain


Either make a cut with a diamond saw--or just jack hammer it--if you crack the slab--the slab has problems--

Once you unearth the pipe you will figure out the easiest piping route--

I would either remove the toilet elbow from the hub---or cut the cast iron near that--convert to plastic (PVC) for the new toilet Elbow--shower drain and vent ,if needed .


Use a jacketed rubber Fernco coupling to convert to plastic.
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Old 07-12-2012, 06:53 PM   #5
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Drain shower into existing toilet drain


Thanks! Sounds good. So after the piping is done I can just go ahead and re-cement around the PVC? Is it strong enough?

Also, do you foresee any problems with the drain if the toilet next to it would be flushed?
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