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Old 01-09-2017, 12:32 PM   #1
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How to repair copper toilet riser


Friend's 40 year old house has a copper toilet riser (located in lower, center of photo) that is corroded and leaking. The toilet fitting is directly next to the kitchen sink fitting. Seems like the easiest repair is to cut the horizontal kitchen drain pipe and to cut just beyond the toilet and kitchen drain fittings and replace with PVC 1/8 & Wyes.

Is a Fernco the item to use to join the PVC to the copper?
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Old 01-09-2017, 12:56 PM   #2
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Re: How to repair copper toilet riser


Yes.

I'd use some pipe dope or PL urethane window and flashing adhesive on the Fernco.

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Old 01-09-2017, 01:19 PM   #3
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I meant to ask ... Why would the riser corrode and not the other pieces?
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Old 01-09-2017, 01:39 PM   #4
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Re: How to repair copper toilet riser


Water hardness, leaking over the years, moisture in basement air, etc., can cause premature staining and corrosion. Copper is notorious for this.

Are you sure it's not leaking from above and dripping down. 40 year old toilet, maybe the wax ring is shot, overflowing toilet or flange is cracked. Looks like a lot of water staining on the wood. Just a suggestion.
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Last edited by jmon; 01-09-2017 at 01:51 PM.
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Old 01-09-2017, 01:46 PM   #5
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Looks as though other peices have started to corrode also, could be something in the water, like an acidic pH. Would seriously consider redoing the plumbing, the scrap money from all that copper would probably pay for a majority
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Old 01-09-2017, 02:07 PM   #6
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Quote:
Originally Posted by jmon View Post
Water hardness, leaking over the years, moisture in basement air, etc., can cause premature staining and corrosion. Copper is notorious for this.
True enough but that doesn't explain why only once piece of the system has failed, especially a vertical piece.

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Are you sure it's not leaking from above and dripping down. 40 year old toilet, maybe the wax ring is shot ...
The pipe actually has tiny holes in its wall so he's sure it's defective.
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Old 01-11-2017, 06:57 AM   #7
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On second thought, what I proposed involves cutting out a lot of good plumbing when the only bad piece is the riser.

If the lowest portion of the riser is intact, is there any way to just replace the riser? How much of the existing riser is needed to use a fernco and PVC to connect to toilet? Is there another device we can use to insert into the riser's fitting (after cutting riser off flush with fitting) and then connect to toilet with PVC?
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Old 01-11-2017, 07:19 AM   #8
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Re: How to repair copper toilet riser


Once we cut into systems of that age we are often in for several condition surprises.
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Old 01-11-2017, 08:22 AM   #9
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Re: How to repair copper toilet riser


Quote:
Originally Posted by SeniorSitizen View Post
Once we cut into systems of that age we are often in for several condition surprises.
True enough, but just in case I only need to replace the riser I'd like to know the best and easiest way to do that.

If only the riser is bad, but it's bad all the way down to the fitting, is there some adapter (e.g. special Fernco) that will allow us to get the new PVC riser attached to, and/or maybe inserted into, that copper fitting?
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Old 01-11-2017, 05:35 PM   #10
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Re: How to repair copper toilet riser


A proflex fernco not the all rubber one.
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Old 01-11-2017, 06:29 PM   #11
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Re: How to repair copper toilet riser


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Originally Posted by Ghostmaker View Post
A proflex fernco not the all rubber one.
Like this one?
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