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Unread 09-03-2019, 08:37 PM   #1
Canvasback Construction
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How can I adapt this drain?

Hey guys, I need to pick some brains on this one. I'm doing a shower remodel in an older home, mid 50's vintage. The old shower just had a deck mud floor that went directly into an old cast iron drain, no waterproofing anywhere, so of course it leaked. I'm planning to go with Durock membrane in the new shower, is there a way I can adapt a Kerdi drain to the cast iron that's already there? Either using the cast iron ring that's already there or maybe a slip fit down into the old pipe? Removing the old drain isn't really an option, homeowner doesn't want to bust up the floor and mess with the old cast iron. Thanks for any advice!
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Unread 09-03-2019, 09:02 PM   #2
Tool Guy - Kg
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Oh, boy. I don't trust re-using that...or the p-trap below. Some might. But I see plumbing that is towards the end of it's useful service life. Normally, I'll include busting into the floor as part of the job. But if you weren't planning on doing that, I can see where it's something you might not wanna do. If that's the case, I would approach the customer and let them know that if they are interested in a long-lasting install that doesn't cause problems, spending a few hours busting into the floor and replacing the p-trap and riser holds a lot of value. This is one of those things I don't give the customer a lot of choice on. I'm the pro. My name is on the job. And I want them to be happy with their shower.
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Unread 09-03-2019, 09:07 PM   #3
Canvasback Construction
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Yeah.....I kind of feel the same way. I will work on them a bit more to see if I can convince them to change everything out....you never know.
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Unread 09-04-2019, 01:27 PM   #4
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can you even get the clamping ring off?
you plan on doing a sloped mortar bed to it?
Durock membrane is designed to be surface applied, if the ring will come off you could go with a Nobleflex Drain Flashing maybe..?
http://noblecompany.com/products/nobleflex/
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Unread 09-05-2019, 06:32 AM   #5
Canvasback Construction
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I convinced the homeowner to replace the drain....it's pretty much the only good way to go I think. Thanks for the advice though guys!
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Unread 09-07-2019, 12:15 PM   #6
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Good move. I don't think that cast iron drain had any weepholes either.
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Unread 09-07-2019, 12:18 PM   #7
Tool Guy - Kg
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Do you have a little demo hammer, or are you going to pound your way through the slab?

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Unread 09-09-2019, 10:04 AM   #8
Canvasback Construction
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I do have a demo hammer, which is awesome, but what's even more awesome is that I got the plumber to bust out the slab and add a new PVC riser on the condition that I would backfill with new concrete. He installed a clamping ring drain and I'm installing a Kerdi adapter drain today-I'm glad that the homeowner was willing to do that, I feel a lot more confident in the integrity of the shower now!
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Unread 09-10-2019, 09:44 PM   #9
Tool Guy - Kg
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Glad to hear. As remodelers, we are continuously faced with finding solutions for a variety of problems. You don't always have to tear it out and start new to do something "right". But this is a case where it's the best course of action for multiple reasons.

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