Small fernco leak under slab

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mtnj31

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Hello guys, hope everyone is doing well. I posted a while back about replacing a P trap under my slab. I was able to cut the cast iron p trap out and attach a PVC trap using a ~4inch fernco coupling. I ran a ton of water through it and there is a small drip leak on the cast iron end. This pipe is roughly 14 inches beneath my slab (we’re on grade). As you can see from the picture there is ground water there from a bunch of rain and snow melting here in NJ so I’m wondering if a very small leak is going to be a problem. The cast iron I’m attaching to definitely has some rusty barnacles on it and is almost impossible to get smooth. I’m wondering if I should just leave it, or change the coupling, or attempt to smoothen the pipe more? Any advice you guys can give would be helpful. Thank you.
 

mtnj31

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Hello guys, hope everyone is doing well. I posted a while back about replacing a P trap under my slab. I was able to cut the cast iron p trap out and attach a PVC trap using a ~4inch fernco coupling. I ran a ton of water through it and there is a small drip leak on the cast iron end. This pipe is roughly 14 inches beneath my slab (we’re on grade). As you can see from the picture there is ground water there from a bunch of rain and snow melting here in NJ so I’m wondering if a very small leak is going to be a problem. The cast iron I’m attaching to definitely has some rusty barnacles on it and is almost impossible to get smooth. I’m wondering if I should just leave it, or change the coupling, or attempt to smoothen the pipe more? Any advice you guys can give would be helpful. Thank you.
 

John Gayewski

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I don't think anyone is going to reccomend installing a leaking pipe.

You need to get a file and/or sand paper, or a wire wheel or whatever to clean the pipe and stop the leak.
 

mtnj31

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I don't think anyone is going to reccomend installing a leaking pipe.

You need to get a file and/or sand paper, or a wire wheel or whatever to clean the pipe and stop the leak.
I thought that might be the consensus. I will get my grinder out and the wire wheel and see if I can smoothen it out some. The darn thing is just so rusted. Thanks for the response.
 

mtnj31

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So I was able to smoothen the pipe with wire wheel. I chipped off the barnacles and the pipe is somewhat smooth, but far from perfect. I noticed though after I cleaned it that there is raised lettering of the company the made the cast. It’s about 1/8 inch raised and I believe this is causing my leak. I was thinking of using my grinder that I used to cut the cast to attempt to trim off the letters to smoothen the pipe out. Anybody have any other tips? Do you think this could be causing the small leak? I tightened the no hub tight but maybe water is seeping around those letters.
 
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