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Unread 03-14-2008, 09:54 AM   #1
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Location: Brooklyn, NY
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Kerdi drain with cast iron drain pipe?


I have a 2-family home in Brooklyn, NY, and I want to renovate the basement. Full gut, moving of plumbing, etc. The basement currently has a small bathroom with a tub, and I want to replace this with a walk-in shower. I am interested in using the Kerdi shower system for this renovation. However, to my knowledge, all our drainage pipes are cast iron (according to NYC plumbing code).

Has anyone successfully installed a Kerdi drain coupled with a cast iron drainage pipe? Is doing so ill-advised?

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Unread 03-14-2008, 09:59 AM   #2
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Amy, PVC to cast iron is done all the time. Look up Fernco on the web. They make all sorts of rubber bushings or couplings for this. In your case, the trap will be plastic, then the coupling will be done on the horizontal run.

One issue you may not have addressed: tub drains are typically 1-1/2" pipe, while shower drains are 2". It's a code thing so you don't want to mess this up. You may have to go all the way to the stack.
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Unread 04-29-2008, 11:32 PM   #3
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ah ha.

here is a thread I was after all night!


You may be in the clear because as I understand it is now recently legal for single fam and maybe 2 fam residential to have pvc waste and drain. Don't go by me tho, I ain'ta plumber i just read the NYC plumbing code last month!

I am also wondering if the kerdi drain can be used with the cast iron pipe. The place I am working on is not single family.
I am afraid that an inspector would need to at least be able to SEE the cast iron below the fernco or hubless so a pvc trap is not a good idea.

any Loungiilanders out there in the pro forum?

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Unread 04-30-2008, 10:13 AM   #4
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Thumbs up stainless steel kerdi drain

may have answered my own question.
It seems there is a stainless steel kerdi drain.
I found this in new releases on their site.
Don't know the cost or availability.

can't post links yet:schluter_dot_com/6876.aspx

Schluter-Systems is pleased to announce the introduction of the stainless steel Schluter-KERDI-DRAIN. The new drain is ideal for tiled floors in commercial applications such as restaurants and factories or for tiled showers where metal drains are required by fire code, including multi-story construction such as condominiums, hotels, and hospitals.

ps. there is another thread on this going right now but i reposted this incase madoka didn't find that. search: cast iron stainless kerdi
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Unread 04-30-2008, 12:57 PM   #5
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I am at "Coverings" now and they have released the Stainless Drain.

Wesley Chapel Florida Tile Installations
...........^^Check out our Blog^^
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Unread 04-30-2008, 02:43 PM   #6
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A regular Kerdi drain is fine for your application... There's absolutely nothing wrong with using a Rubber Fernco fitting to transition the drain to a Cast Iron trap...

As far as I know, PVC is still illegal in multi-family dwellings in NYC. If the building dept will allow you to build a Kerdi shower, I doubt they'll have an issue with the use of the PVC flange... I'm not sure what they'll say about a kerdi shower though... Those guys just dont like the idea of change.

I have done a few Kerdi showers in there when the big bad inspector wasnt looking...
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