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Old 01-06-2014, 10:24 PM   #16
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Serious slab leak - need advice


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Originally Posted by oh'mike View Post
Finding the leak under your slab is the challenge---with it isolated by the wood floor structure---you need to have an experienced plumber help---a plumber will have x-ray vision (just kidding) from years of working on houses similar to yours---'

If you are lucky enough to find the leak and expose the bad pipe----I would have a plumber do the brazing---that is a learned skill--using an expensive torch--no need to own one of those for a one shot deal---and if your work failed? What a night mare.

I still think you should at least consider a repipe job----above the slab---
Thanks oh'mike:

We are most likely going to take your advice and have a plumber do the drilling through the slab and any brazing or pipe connecting, and thank you for your help with this.

I just don't know how to do under slab plumbing problems. I can do sweat fittings, but that's about the extent of it.

Since I have dug a hole and have found pipes and can see where the pipes go into the slab, there is no leak from the pipes that are in the ground. The leak comes dripping from under the slab when the hot water is on so the leak is within the slab itself under the sink area. We also have no water in our house like under the cabinet, on the floors, etc. Digging alone, it's taken me quite a while with all the weather to dig this hole so no hot water for quite a while. The wife may leave. She doesn't seem to appreciate bathing from a tea-cup.

We see a bit of an angle from where the kitchen sink connects to the water supply and where the under-slab pipes actually are.

We are thinking now that we have a hole under the slab, and can see the leak, couldn't the plumber (from inside the house) drill under the kitchen sink, through the slab, and replace the pipes since he will be able to get to the pipes through the hole we've dug?

I value your input. Thank you for your help.

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Old 01-06-2014, 10:47 PM   #17
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Serious slab leak - need advice


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Do you know where the pipe you think is leaking enters the ground? Cut it and cap it turn the water back on and see if that is it. If it is you can try one thing that may work.
If it is 3/4 or 1/2 inch you can insert a smaller pex pipe through the broken line reattach it to the fixture and your water supply you now have water. The other way is you break the concrete from both ends where the pipe comes up. Tie replacement pex to one end and then pull it through with the broken pipe. I have done both.
Thanks Ghostmaker:
That is an interesting idea. We have 1/2 inch pipe. We are going to have to break concrete since we are about 100% sure the leak is within the slab between the sink and the pipes under the house. Pex comes in many diameters, right? So, you could get 3/8ths inch pex, tie it to one end of a piece of pipe or something long enough to go through the broken pipe, pull it up through the broken pipe, and finish the connection under the sink? That sure sounds like an easier fix than removing so much concrete.

I guess what I'm wondering is, is pex strong enough for a slab leak fix such as this? How would a 3/8" piece of pex effect the water pressure?
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Old 01-07-2014, 05:54 PM   #18
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Serious slab leak - need advice


If your just feeding a single sink you can use 3/8 inch pex through the pipe. If the distance is not that far I would just break out both sides tie the 1/2 good pex on one side and pull the bad pipe out from the other side. That is the better repair. You may need to extend the bad copper so you can get a grip on it just add a bit more copper to it.

With a pex manofold it is common to run 3/8 inch pex from the manofold to the toilets and the lavs as individual runs. It is actually the better way to do it since hot water travels 75 foot a min through 3/8 inch pipe versus 52 foot a min in 1/2 inch pipe. Your only feeding 1 fixture and as long as it is a sink it will be fine.

Any other way will probably cost you a small fortune for the repair.
The pipe
http://www.amazon.com/SharkBite-U850...2F8+pex+tubing

http://www.pexsupply.com/Sharkbite-C...Feg-Mgod4XEASA the coupling to your good 1/2 copper

http://www.grainger.com/product/19F9...140108001543:s The faucet connector you put on the faucet end.

http://www.sears.com/shc/s/p_10153_1...0125xMPTLSx025 Use this instead of the coupling if you want a way to shut off that line.

I would try this total cost is 70 dollars and time. If you don't find enough water then go the more expensive tear out the slab way...

Last edited by Ghostmaker; 01-07-2014 at 06:24 PM.
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Old 01-07-2014, 07:25 PM   #19
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Serious slab leak - need advice


Quote:
Originally Posted by Ghostmaker View Post
If your just feeding a single sink you can use 3/8 inch pex through the pipe. If the distance is not that far I would just break out both sides tie the 1/2 good pex on one side and pull the bad pipe out from the other side. That is the better repair. You may need to extend the bad copper so you can get a grip on it just add a bit more copper to it.

With a pex manofold it is common to run 3/8 inch pex from the manofold to the toilets and the lavs as individual runs. It is actually the better way to do it since hot water travels 75 foot a min through 3/8 inch pipe versus 52 foot a min in 1/2 inch pipe. Your only feeding 1 fixture and as long as it is a sink it will be fine.

Any other way will probably cost you a small fortune for the repair.
The pipe
http://www.amazon.com/SharkBite-U850...2F8+pex+tubing

http://www.pexsupply.com/Sharkbite-C...Feg-Mgod4XEASA the coupling to your good 1/2 copper

http://www.grainger.com/product/19F9...140108001543:s The faucet connector you put on the faucet end.

http://www.sears.com/shc/s/p_10153_1...0125xMPTLSx025 Use this instead of the coupling if you want a way to shut off that line.

I would try this total cost is 70 dollars and time. If you don't find enough water then go the more expensive tear out the slab way...
Ghostmaker:

This is great info. I don't wish my problem on anyone else, but if there are others with a similar problem I hope they are reading this. So appreciate your time to give me and anyone on this forum these tips.

Thanks from a desperate Dallas (new to my resume) digger.
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Old 01-17-2014, 04:38 PM   #20
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Serious slab leak - need advice


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Originally Posted by oh'mike View Post
Finding the leak under your slab is the challenge---with it isolated by the wood floor structure---you need to have an experienced plumber help---a plumber will have x-ray vision (just kidding) from years of working on houses similar to yours---'

If you are lucky enough to find the leak and expose the bad pipe----I would have a plumber do the brazing---that is a learned skill--using an expensive torch--no need to own one of those for a one shot deal---and if your work failed? What a night mare.

I still think you should at least consider a repipe job----above the slab---
Thought I would give you an update on our slab leak. Got the hole dug and exposed the pipe. Digging the hole was slow due to weather such as wind, cold, and rain. Had to dry out the hole a number of times to just be able to get in it.

We did have a plumber come out and his first comment was, "man that is one really good hole. In fact, it's about a $1600 hole." He and his helper came out today and fixed the leak. They drilled through the foundation on the outside, re-routed the plumbing using PEX, and connected it to the pipe under the foundation using the hole I dug. It cost around $375.00 I probably could have done this myself, but felt like a plumbers experience was worth these bucks to be done with this 1 1/2 month situation and the salvation of my marriage. Didn't realize how much water is wasted by human beings by simply using a hot water heater, but hot water is truly divine. BTW, found a source for 1" x 30" drill bits for $108.00 at confast.com. Don't know how good these bits are but compared to the $300 I was told by other sources, just wanted to pass this along.

Thanks to all for your time to give me tips on what to do.
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Old 01-17-2014, 05:33 PM   #21
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Serious slab leak - need advice


That was one sweet job---keep that plumbers number---you got a good price and I think he admired your extraordinary effort.!
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Old 01-17-2014, 05:55 PM   #22
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That was one sweet job---keep that plumbers number---you got a good price and I think he admired your extraordinary effort.!
Thanks oh'mike. Will do.

And, since we are members of a social network called "NextDoor" (which is where we got the referral to this local plumbing company in the first place and which is a national organization who organizes neighborhoods for the purpose of referrals, etc.) I will post our results and glowing referral to these guys on the network. It's Chambers Plumbing in Richardson, Tx. If all things remain equal, we will be using them for the rest of our lives. They were fair, fast, honest, accurate, and reasonable.

Cheers
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Old 01-17-2014, 06:20 PM   #23
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Serious slab leak - need advice


It sure is nice to see a good plumber get a pat on the back----I'll let this one stay---

Glad your house is back in order---Mike----
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Old 01-17-2014, 06:43 PM   #24
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Serious slab leak - need advice


Good plumber.. He's a keeper.

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