Water seeping through where pipe exits slab foundation


Originally Posted by



Thanks for your quick reply. Regarding my policy, I thought it was clear they pay for damage caused by the broken pipe and damage caused to repair the pipe.

So if the pipe broke and had to be fixed in the ceiling or walls than the repair is covered. If the pipe has to be repaired in the slab then its not? Why is the slab considered "outside" of the house?

I think maybe you missed something in my response.

Has nothing to do with the slab being inside or outside. It has to do with whether or not the slab was damaged.

In order for anything to be covered, there has to be damage to covered property by the water that leaked out of the pipe.

Damage caused by water that is discharged from a plumbing system is covered. But it wasn't the water that damaged the pipe, it was the deterioration of pipe that damaged the pipe, and deterioration is not a covered cause of loss.

The water did not damage the slab...

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[Summary]How to Fix Leaking Pipes Under a Slab Foundation | Home Guides | SF Gate Elusive leaks Hard to find slab leaks require the use of specialized listening devices. After the water is turned off, air is pumped into the lines to force out remaining water.


How to Fix Leaking Pipes Under a Slab Foundation | Home Guides | SF Gate

Elusive leaks

Hard to find slab leaks require the use of specialized listening devices. After the water is turned off, air is pumped into the lines to force out remaining water. This allows the plumber to listen for escaping air from the damaged pipe. Once the leak is identified, the plumber can ascertain the best way to go about repairing it. Sometimes it is better to re-plumb the entire house rather than waste money repairing old plumbing. This is recommended when a home is plumbed with old galvanized piping. Repairing those old pipes is often not cost effective because they are extremely hard to...

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Hi, new to this forum.

Question about a hot water pipe burst under a concrete slab floor in a small commercial building. The hot water supply pipe that services three sinks in the building is imbedded into the slab about 2 - 3 inches below the floor's top surface. There is no floor covering over the concrete.

Water escaped from the line through a breach in the pipe for at least a month before being discovered, and now there is a crack in the floor. A void is suspected under the slab caused by the water pressure scocuring out the sand that was laid and compacted at the time the stucture was built. The void that we suspect exists is approximately in the middle of the slab, roughly 10 to 12 feet in from the front of the slab. there is a new crack in the surface of the slab in the area where the void is suspected.

Slabjacking or pressure grouting is being considered to fill the suspected void but there is an argument by the insurance adjuster that the concrete (20...

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Pulpo: the pipe supplies a hose bibb in the yard and i don't care if it is no longer functional. Frankly, it's a trip/mower hazard, as it barely protrudes above the ground. [EDIT] - the addition is the only part built on a slab and the rest of the house was re-piped with PEX from the street valve to the house, then PVC/CPVC for the cold/hot supply lines, respective. Solvent to FPT unions were used to connect the addition's galvanized supply lines to the new plumbing.

Norm201: The addition is a bathroom which is functional and much-used. To cap this pipe off at the source, so to speak, would require removing a toilet, tearing up the tile and then cutting into the slab. I can easily see that amount of work costing $1000's.

I would much prefer to cut away some more of the slab to get at some "fresh" pipe and then somehow cap it off. Obviously there is no way to get a pipe threader in there, so I was thinking there might be some kind of epoxy I could inject into the...

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When it comes to your plumbing, most people don’t even think about it until there is a problem. In most cases, plumbing leaks in Jacksonville FL are noticeable before they cause extensive damage by leaving water stains, soft spots, and a musty odor behind. But what if the leak happens in your concrete slab foundation?

Signs of a Slab Leak
In most cases, because water pipes are located beneath your floors and gravity will keep the plumbing leaks in your Jacksonville, FL home away from your floors, it will be difficult to know you have a leak until your utility bill shows up. It might be reflected in the water bill alone if the leak is in one of the cold water pipes, but you might also feel some sticker shock on the electric or gas side of the bill if the leak is in a hot water pipe. Some of the signs of a water leak under your slab include:

You see that your water meter seems to be spinning at a higher rate than normal, or you notice that the water heater runs more...
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Bernoulli's equation reads:

Pi + 1/2(density)(Vi)^2 = Pe + 1/2(density)(Ve)^2 , where P and V are
the pressure and velocity and the i and e subscripts indicate initial
and exit values. There is no height term since the pipe is horizontal.

Let's say the inital pressure Pi is very high say thousands of bars. I
want to find the velocity on exit from the pipe when it empties to the
ambient pressure, Pe = 1 bar.
In addition to the Bernoulli principle an equation used to calculate
the velocity of a fluid stream is the continuity equation AeVe = AiVi,
where A is the cross-sectional area of the pipe, with e and i again
meaning initial and exit values. This equation holds since assuming an
incompressible liquid the total volume flowing in must equal the volume
flowing out.
Therefore if the pipe is at constant diameter the velocity should stay
the same. But that means in the Bernoulli equation above the...

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Assuming you have lived there for a few years so you know what is normal, I would start with a couple of checks before paying for a professional. Some of these possible causes might cause water seepage for a week or more after a rain or similar water source event, as it seeps down to the floor level. Some others would cause continuing seepage - I think it is pretty self-evident which is which. These are ALL causes I have seen cause concrete slab dampness, though usually in basements not on-grade garage floors. If you are pretty sure the source is under the garage floor, I would skip to #15 through #18 first, then try the others after that.

1) if you have kids, or grandkids visiting, check they have not been playing with water near the foundation

2) look for a leak at or near furnace or hot water heater that might be going into a crack in the concrete, then appearing as seepage through the concrete elsewhere

3) check for a hose or hose bib (faucet) leaking or...

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Stop Leaks Around Conduit, Water Supply Lines, Sewer Pipes and Protrusions with Polyurethane Foam

Concrete foundations and basements have several penetrations through the walls. These include water supply lines, sewer pipes, conduit and gas lines. These penetrations can allow a direct path for water to leak through. At the time of installation, water plug is used to seal the water out. Over time the bond to the concrete can deteriorate and water will leak in.

Polyurethane foam injection around the pipe that goes through your concrete basement wall will stop the water leak.

Hydra Stop 300 Finished Foam

The liquid Hydra Stop 300 resin expands 20-30x its initial volume.

Adheres to:

Copper PVC Plastic Concrete

Water Leaks Around Conduit, Pipes, Water Lines and Penetrations in Concrete Walls

All penetrations through a concrete foundation can leak water. That is because when the water line, conduit, sewer pipe or other...

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When pipes are run through the walls of your foundation, they are typically sealed up with concrete, hydraulic cement, or caulk. Sometimes, they're not sealed at all! These penetrations are one of the weakest links in the foundation walls when it comes to holding back groundwater, and it's very common for them to leak water. To solve this problem, a series of solutions have been tried. All of them work at least some of the time.

Sealing the Crack with Caulk or Cement

Often, caulk or cement is coated over the crack in an attempt to seal off the crack. However, this repair is a superficial one, and it does not stop water from working its way into the crack. Water will still fill the crack behind the patch, and a white, powdery mineral buildup, called efflorescence, builds up behind the crack. The efflorescence will break down the seal, while the water pressure pushes at the caulk or cement. Soon, the combined forces of water and efflorescence will break the seal, and...

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Asking what it costs to fix leaks is pretty ambiguous unless you know where your basement water is leaking from. This can be difficult, unless the leak is obvious, because water travels. But like it or not, the cost is defined by the cause so until you are able to determine the source of your leak, you’re working with an open checkbook.

If you have to hire a qualified contractor to find the leak for you, it can get quite expensive. Calling a plumber may not even be the right trade or the only trade to handle your leak. When a leak has gone untreated for a period of time, there may also be residual damage that needs repair in addition to the leak itself compounding your costs.

There are steps you can take to save contractor cost by determining where your basement water is leaking from yourself. The source of your water leaks can be pretty easy to locate. When you have found the likely source (through process of elimination), then you are better equipped to decide...

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