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Patching a Cast Iron Drain
Posted by: Randalls
Date: September 02, 2020 04:28PM
Have an old house and discovered there is a leak from the drain under the kitchen sink going in to the basement floor. Hole is approximately .25 wide by .75 high. What are the odds that this can be patched with J.B. Weld or "Steel Putty" or should I just bite the bullet and call the plumber. Sure don't want to dig up the drain at this point but not looking good. The black area is some flashing seal I had which did not work.
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Re: Patching a Cast Iron Drain
Posted by: mattkime
Date: September 02, 2020 04:33PM
>J.B. Weld or "Steel Putty

give it a go and let us know!



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Re: Patching a Cast Iron Drain
Posted by: tlh828
Date: September 02, 2020 04:34PM
I've used epoxy tape in a similar situation. If it's a drain there is little pressure and basically it's a matter of stopping a a low pressure leak. JB Weld might work but I'd still put epoxy tape over it.
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Re: Patching a Cast Iron Drain
Posted by: Cary
Date: September 02, 2020 04:36PM
I would cut out the rotted parts last the 90 degree ang!es, get a pvc 90, some pipe and rubber fernco clamps, and replace the section. If more is rotted, but it out at the same time.
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Re: Patching a Cast Iron Drain
Posted by: btfc
Date: September 02, 2020 04:36PM
[www.jbweld.com]
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Re: Patching a Cast Iron Drain
Posted by: JoeH
Date: September 02, 2020 04:37PM
For a temporary fix one of those should work. "temporary" could be weeks, months or years. But if the cast iron has corroded or eroded enough to create a hole that large, other areas of the drain will also be getting ready to fail.
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Re: Patching a Cast Iron Drain
Posted by: davester
Date: September 02, 2020 05:17PM
As JoeH indicated, that looks like one of those "tip of the iceberg" leaks. JBWeld might work for a little while, but how little is unknown.



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Re: Patching a Cast Iron Drain
Posted by: Randalls
Date: September 02, 2020 05:27PM
Pretty much what I expected to hear. I will report back for the temporary fix and probably have a pro look at it and tell me the bad news.
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Re: Patching a Cast Iron Drain
Posted by: fauch
Date: September 02, 2020 06:21PM
It will work, but will eventually fail. But you can just do it again when it does. Just keep and eye on it. My father patched a car radiator for YEARS with "liquid steel" and that was high heat AND pressure. Every two years or so it would start to leak again and he would replace the patch, worked good as new and saved quite a few bucks and extended the life of an old clunker...
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Re: Patching a Cast Iron Drain
Posted by: Randalls
Date: September 02, 2020 08:15PM
Good to know. Went with the JB Weld Waterweld putty as btfc suggested. Cleaned and scoured before application. Curing now. Fingers crossed. I will test tomorrow.
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Re: Patching a Cast Iron Drain
Posted by: Randalls
Date: September 06, 2020 07:36PM
Been a couple days and the patch is doing it’s job. Thumbs up for the J B Weld epoxy putty.



Edited 1 time(s). Last edit at 09/06/2020 07:37PM by Randalls.
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