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Old 03-31-2012, 07:18 PM   #1
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Slab leak or not?


I just recently had a slab leak, and the plumbers jack hammered a hole in the slab and fixed the T joint that had a hole in it. That was 3 weeks ago. Now I know that once you find 1 leak there's a good chance that more leaks are to come.

I know where the hot water line runs under my slab and along the entire line I can feel the carpet/tile warm. The warm "spot" is not exactly a spot. It is a straight line about 3ft in width that runs exactly above the hot water line, which is about a foot under the slab.

I find it hard to believe that a slab leak would warm the slab in a straight line like that, but I am also not sure if the hot water pipe would warm the slab when its not even in the concrete. It's in dirt underneath the slab. What are you thoughts?

Thanks.

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Old 03-31-2012, 07:30 PM   #2
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Check your meter---is it running when all fixtures are turned off?

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Old 03-31-2012, 07:38 PM   #3
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Check your meter---is it running when all fixtures are turned off?
Oh forgot to mention. I live in a condo building with 8 shared units. The hot water lines are all connected so I can't use that method.
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Old 03-31-2012, 07:46 PM   #4
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Shucks---that's all I have!

In a prefect line? Most likely just heat loss from a hot water line----
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Old 03-31-2012, 07:49 PM   #5
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Shucks---that's all I have!

In a prefect line? Most likely just heat loss from a hot water line----
Yea, I walked along the line with my bare feet and side stepped to both sides until the carpet cooled. Its pretty much a straight line. I just didn't think that the hot water line was hot enough to heat through 1 foot of dirt and ~3in of concrete.
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Old 03-31-2012, 07:51 PM   #6
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Slab leak or not?


What material is the line?
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Old 03-31-2012, 07:54 PM   #7
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What material is the line?
Copper
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Old 03-31-2012, 08:04 PM   #8
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Unusual should be no connections under a slab when copper is the supply, anyhow depending on the age of the line and the fill thatís under the foundation it may be time for a repipe. Once copper under a slab starts leaking itís all downhill.
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Old 03-31-2012, 08:09 PM   #9
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Unusual should be no connections under a slab when copper is the supply, anyhow depending on the age of the line and the fill thatís under the foundation it may be time for a repipe. Once copper under a slab starts leaking itís all downhill.
The building was built in the 70's, so maybe that's how they used to do it? Any how, thanks for your comments.
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Old 03-31-2012, 08:47 PM   #10
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Oh forgot to mention. I live in a condo building with 8 shared units. The hot water lines are all connected so I can't use that method.
Is it a multi-level condo? If so and if the copper water lines are starting to develop leaks, will there be a chance of an upper floor leak damaging your belongings?

The hot water lines in copper will usually develop leaks before the cold lines do if the pipes are deteriorating.

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Old 03-31-2012, 08:52 PM   #11
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Is it a multi-level condo? If so and if the copper water lines are starting to develop leaks, will there be a chance of an upper floor leak damaging your belongings?

The hot water lines in copper will usually develop leaks before the cold lines do if the pipes are deteriorating.

HRG
Yikes, I don't even want to think about a leak from upstairs right now. Still recovering from my slab leak. I live in a 2 story building.

Anyone know if it is physically possible for the water that is contained in the copper pipe to warm the concrete slab?
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Old 04-01-2012, 01:25 AM   #12
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Anyone know if it is physically possible for the water that is contained in the copper pipe to warm the concrete slab?
Is your cold water warm?

When we had a slow hot water leak under our concrete slab, it affected the cold water line. Turning on the cold water in either of the back-to-back bathroom sinks would run cold for about 4 to 5 seconds (as I recall), then gradually get warmer, then gradually get colder again. That's the symptom that made me realize that the hot water pipe was leaking under the slab.

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