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Old 03-27-2016, 08:58 AM   #1
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Shower Drain Help


Hello,

I'm remodeling a small shower and I gutted it to the studs and concrete slab. The drain is an old cast iron 3 piece (or so that is what it looks like to me) and it needs to be replaced. It is embedded in the concrete slab so I guess I need to chisel around it to expose it. I'm hoping the ptrap below this drain is PVC becuase the rest of the plumbing in the house is PVC. My question is, how far around the drain should I chisel out? I want to make sure I have enough room to work but also don't want to remove too much concrete.

Any advice on removing this drain would be appreciated. Thanks!
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Old 03-27-2016, 09:06 AM   #2
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Re: Shower Drain Help


I would rent a chipping hammer and open up about 16" square---

The rust inside that riser pipe coming off the P-trap tells me that replacing the P-trap would be very wise---showers requirea 2" drain and P-trap.
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Old 03-27-2016, 09:28 AM   #3
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Re: Shower Drain Help


its most likley cast iron pipe under the slab.
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Old 03-27-2016, 09:56 AM   #4
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Re: Shower Drain Help


Thanks guys. Once I get the drain exposed and remove the cast iron pieces can I replace them with PVC?
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Old 03-27-2016, 10:55 AM   #5
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Re: Shower Drain Help


Yes, PVC is the way to go---
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Old 04-02-2016, 12:43 PM   #6
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Re: Shower Drain Help


I got the concrete busted up around the shower drain. Fortunately there is PVC pipe under the cast iron drain flange. Looks like it is glued into the 4" PVC drain pipe. Should I dig more out around the drain so I can cut the drain flange off or can I cut from the inside of the drain to remove the flange? My only concern with widening the hole more is that to the left and right of the drain there is a load-bearing wall about 13" away. Don't want the floor to collapse!

After it is removed I'm assuming I will have to add an extension to get the pipe level or above the floor. Attached a pic for you guys.
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Old 04-02-2016, 12:48 PM   #7
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Re: Shower Drain Help


that just looks like a sleeve they originally put in to keep the concrete back from the pipe..
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Old 04-02-2016, 12:59 PM   #8
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Re: Shower Drain Help


Woodchopper,

Does that mean it should be removed or can it stay? As an FYI the rest of the drain plumbing in the house is PVC.
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Old 04-02-2016, 01:07 PM   #9
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Re: Shower Drain Help


Are you going to install a new shower base? It would help to know what your intent is.
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Old 04-02-2016, 01:09 PM   #10
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Re: Shower Drain Help


Yes, going to install new shower mortar bed (pre-slope and tile slope).
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Old 04-02-2016, 01:27 PM   #11
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Re: Shower Drain Help


Quote:
Originally Posted by wkumtrider View Post
Woodchopper,

Does that mean it should be removed or can it stay? As an FYI the rest of the drain plumbing in the house is PVC.
yes you can remove it, if you have a sawsall you can cut the brass plate down to the threads and knock it off with a hammer so you can see better what you are doing..just put a rag into the pipe so nothing falls in by accident..
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Old 04-02-2016, 01:49 PM   #12
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Re: Shower Drain Help


Why would I need to remove the PVC sleeve? That is what the old shower drain was connected to, as show in the pic with the flange still attached to it. Just curious.

Thanks.
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Old 04-02-2016, 01:53 PM   #13
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Re: Shower Drain Help


the shower drain is not connected to it..keep digging down you will find the bottom of the pvc soon..
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Old 04-02-2016, 02:12 PM   #14
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Re: Shower Drain Help


I guess I'm confused because that is where the shower drained when it was in service. Not sure what you mean the shower drain is not connected to it. Not being smart, just trying to understand.
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Old 04-02-2016, 03:12 PM   #15
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Re: Shower Drain Help


Quote:
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I guess I'm confused because that is where the shower drained when it was in service. Not sure what you mean the shower drain is not connected to it. Not being smart, just trying to understand.
the actual drain pipe connected to the bottom of the strainer is only 2 inch cast iron pipe, the 4 inch wide piece of pvc was just put in so when the concrete was poured it would leave enough room to put the strainer down and probably caulk it in with melted lead and oakkum...once you finish chopping a bigger area you will see what is meant and it will make more sense..
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