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ThatGuy803

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Good morning folks. Seeking a bit of pro advice here. I have a water leak somewhere under my slab. I found these stacks, or whatever there called, in my wall and i can hear water moving through them, when there are no faucets turned on. Rather than busting up the slab, i theoretically would like to cap these and reroute water into the section of my house, which is just the kitchen, where i believe the water is leaking. Any advice would be greatly appreciated. Thanks in advance.
 

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Reach4

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You are not allowed to bury copper connections in a slab, so that is how they connect pipes for a slab. In this case, they were making tees.

That works to your benefit in this case, because you have the access that you need. You can cap the lines. I am not a pro.
 

ThatGuy803

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You are not allowed to bury copper connections in a slab, so that is how they connect pipes for a slab. In this case, they were making tees.

That works to your benefit in this case, because you have the access that you need. You can cap the lines. I am not a pro.
Any idea why there are two of them? Would it be possible to pinpoint which one of these lines is where the actual leak is coming from, so i dont have to reroute to every single point in the kitchen, which includes my sink faucet, hot water heater, laundry hookup, and an outside hose bib?
 

Dj2

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How old are your copper pipes?

What type copper pipes do you have? M (red markings on the pipes) or L (blue markings).

Under slab leaks are never good, and sometimes repairs don't hold.

I had old pipes develop multi pin hole leaks, and the best solution was to re-pipe.
 

Asktom

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The soft copper under the slab will be type L, or remotely possibly type K. It is often easier/cheaper to repipe overhead, but it depends on the situation. It might be possible to determine which line is leaking and just redo that one (under the slab or overhead), but if one line is leaking now others may well follow. It is also possible that the copper was kinked when it was rolled up into the wall, which can cause a leak near the wall which might be fixed without massive demo by somebody who knows what they are doing (it must be blazed or flared).
 
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