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Unread 01-10-2021, 03:44 PM   #1
nickhay13
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ABS Shower Drain on Cast Iron Drain Pipe

Hi All,

I've been referencing these forums for years for DIY projects in my home and you guys got me through my last bathroom remodel with ease. I've finally had to make an account because I have run into an issue which I'm not 100% clear on.

I'm in the process of remodeling a bathroom and I've completed the tear out. The old shower was a mud bed with a hot mop and I'm down to the concrete sub floor. Today I started the process of removing the old shower drain to install a new three piece drain and discovered that whoever last remodeled this shower glued a three piece ABS shower drain assembly directly onto the cast iron drain pipe. This seems to have held up fine for many years (I've owned the home for 8 years and this was done long before that). However, to my knowledge that is a no-go.

I just want to make sure I'm not missing anything or an easier way to accomplish this because going forward I'm under the impression that I need to cut the concrete and dig down beyond the P-Trap and use a mechanical coupler to tie a new ABS drain pipe into the old cast iron (with a new ABS P-Trap and drain pipe coming up vertically that I will glue to three piece drain into.

I have attached a picture for reference. Please ignore the holes in the drain assembly, my inside pipe cutter was not big enough to cut the collar off of the drain so I was in the process of drilling the old drain assembly out until I realized I was dealing with cast iron below.

Any insight is greatly appreciated.
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Unread 01-10-2021, 04:56 PM   #2
Davy
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Hi Nick, welcome back. I'd go ahead and bust more concrete out along with some dirt, then post another picture. Is the drain already centered or do you need to move it?
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Unread 01-10-2021, 05:50 PM   #3
nickhay13
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Hi Davy,

I have not cemented anything as I haven't installed the new drain yet. I do not need to move the drain, I just believe I need to get rid of the cast iron P-Trap and vertical pipe and replace with ABS in order to glue in the ABS drain. I won't be able to cut the concrete and dig more up until next weekend.

Edit: I misread centered as cemented.. my apologies. But no, I do not need to move the drain.
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Unread 01-10-2021, 06:16 PM   #4
jadnashua
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There's one possibility that may work for you without tearing things out completely.

Is the end of that cast iron a hub?

Fernco, and probably some others, make rubber donuts that are designed to sit in a hub, and allow a pipe to seal inside it. https://www.fernco.com/plumbing/donuts-o-rings/donuts
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Unread 01-10-2021, 07:14 PM   #5
nickhay13
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Hi Jim,

Unfortunately it is not a hub, it's just a cast iron pipe that the current drain is glued to. It sounds like I will be digging up the whole area and replacing the entire setup with ABS from before the trap.
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Unread 01-10-2021, 09:36 PM   #6
jadnashua
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Another alternative would be to cut the CI pipe off some, then use a no-hub connector to attach a short ABS riser to it, and then glue your new drain onto it. Whether that's an option would depend on how tall the existing riser is. Or, if there's a hub below, use the donut, an abs riser, and glue on your new drain. The donut gives you a little leeway about getting the drain perfectly level if the current riser is not perfectly plumb. To remove a pipe from a hub, you normally would drill out the lead making it sort of like Swiss cheese, then you should be able to rock the pipe back and forth, and pull it out. Clean up the hub with a wire brush, insert the donut and go.

But, since you may not know the condition of the p-trap underneath, it can make some sense to tear it out and replace while you're replacing the shower. CI can last eons, but under some situations, it could be corroded nearly through.
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