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Old 09-01-2013, 09:15 AM   #1
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How to repair plastic drain that's not accessible


I have a pin hole leak in the plastic drain coming out of a bath tub. Obviously the best fix would be to replace the drain, but it would require cutting out a floor joist to remove the old drain. The leak is over my concrete garage floor. Is there something I can use to seal the leak without having to do major construction here? I've heard that there's some type of epoxy putty that might work. Advise welcome!

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Old 09-01-2013, 12:45 PM   #2
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How to repair plastic drain that's not accessible


What exactly is leaking? If it is the pipe you will need to cut it out and replace it.

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Old 09-01-2013, 05:54 PM   #3
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How to repair plastic drain that's not accessible


There is a pin size hole in the bottom of the plastic drain piece that comes out of the bottom of the tub causing about a tablespoon of water to drop to the garage floor below when ever the tub is drained. Getting enough room around the drain from below to remove and replace will require cutting out the floor joist in that area. If there is any way to stop the leak without going to all of this trouble, I would rather take that path. The drain comes out of the bottom of the tub and then takes a 90 degree turn right above the joist.
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Old 09-01-2013, 05:57 PM   #4
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How to repair plastic drain that's not accessible


Got a picture?
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Old 09-01-2013, 06:01 PM   #5
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How to repair plastic drain that's not accessible


Where's the leak coming from on that drain?

Got a picture of the area?

If it's that small of a leak then what about just putting some sort of catch pan under it and allowing it to evaporate (a la the pan under a refrigerator). Not ideal but if it's really only that small of an amount it might work.
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Old 09-01-2013, 06:11 PM   #6
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How to repair plastic drain that's not accessible


Is it the tub shoe? They are replaceable, some easier than others- depending on the style.

There are a lot of so called leak patches- but no body will fess up to using them- especially plumbers. We would rather do it the proper way and replace the pipe or fitting.
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Old 09-01-2013, 06:33 PM   #7
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How to repair plastic drain that's not accessible


Quote:
Originally Posted by TheEplumber View Post
There are a lot of so called leak patches- but no body will fess up to using them- especially plumbers..
so true, but i'm not a plumber
I have seen JB weld used more than once on small pinholes in drain pipes.
But i don't know who might have done that

the correct way is to remove and replace the defective piece.
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Old 09-01-2013, 08:36 PM   #8
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How to repair plastic drain that's not accessible


If it is a real small pinhole you can heat up a flat blade screw driver and carefully melt it closed. I did not tell you that.
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Old 09-01-2013, 10:02 PM   #9
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How to repair plastic drain that's not accessible


And I didn't mention that if the pipe was clean and dry that a fella could put an even coating of silicone sealant on a strip cut from a plastic bag and then wrap it around the problem area (several wraps is best). It will probably work, but, if it doesn't, you can always do it right the second time.
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Old 09-02-2013, 02:56 AM   #10
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How to repair plastic drain that's not accessible


Silicone rescue tape also comes to mind, but that would likely require access to wrap around the whole pipe. Thus the picture suggestion...
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Old 09-02-2013, 07:16 AM   #11
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How to repair plastic drain that's not accessible


Come on guys, this is a pinhole leak in a pipe that's exposed to essentially zero pressure. Just about any McGyver fix will work. I'd probably use aluminum duct tape.
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Old 09-02-2013, 07:44 AM   #12
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How to repair plastic drain that's not accessible


It'd be a bit odd for a piece of plastic to develop a 'pinhole leak'. It'd be more likely to either be a crack (due to stress on it) or a bad connection between fittings (loose or not glued properly). Anything's possible, of course. The reason for it would be helpful to establish.
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Old 09-02-2013, 08:11 AM   #13
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How to repair plastic drain that's not accessible


That's what I was thinking. Plastic pieces aren't prone to having pin holes show up in them. I would check that the drain is tight.
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Old 09-02-2013, 01:17 PM   #14
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How to repair plastic drain that's not accessible


Thank you for all of the advice! The house is 35 years old and it's been fine until now. I'm going to try the low tech route first by using a stick of JB Weld. I've attached a picture (looking straight up from beneath the tub area) and you can see how the floor joist poses an obstacle to replacing the shoe.
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How to repair plastic drain that's not accessible-drain-leak.jpg  
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Old 09-02-2013, 03:29 PM   #15
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How to repair plastic drain that's not accessible


Since you have access i would just replace it thats the best way to go and if your handy is not that difficult.Also are you sure the leak is there and not starting at the gasket below the tub? The watermark shows that this might be the culprit..

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