PVC Water line keeps getting pin holes


The water line that goes from my boiler, carrying warm water keeps getting pin hole leaks. The line is a standard flexible white plastic insulated pipe, covered in a red mantle.

About a year ago, I discovered the first pinhole leak, spraying water into the mantle. The result was a big pool of water under my floor. A plumber came by and replaced part of the pipe with a new part.

And what do you know... A little while after, a new leak appeared, about 10CM below the original leak. The plumber came back and replaced an even bigger part of the pipe.

Now, again, the same water line is leaking... the leak is just below the replaced part, leaking water into the mantle...

The plumber ensures me it's just a faulty pipe. The problem is that the whole line is not exposed, so it would be very difficult to replace it in its entirety.

The pipe is the same brand as all the other water lines of my water system. Only this one keeps rupturing. What is going...

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When you do a repair, is the pipe fairly thin? Generally once you start getting pinholes you will chase them forever. It's probably time to repipe with pex.

Copper is great, except when it isn't. Some soils erode copper, some water supplies erode copper. Electrolysis generally occurs at the connection or contact point of two dissimilar metals, not at pin-hole locations throughout the system.

A mild shock is the result of voltage potential. Proper grounding of everything eliminates the difference so it does not happen. You could try running a voltmeter to the water pipe and another ground, say the ground prong in a receptacle to insure the two are properly bonded. You should also check the bonding connections at the ground rod or ufer and in the panel.

Oftentimes the sense of a mild shock is a result of difference in temperatures or textures and not really a shock at all.

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1 Answer

We have a Goodman GSK9 gas furnace. There is a weep hole on the PVC outside of the house, that in the winter develops a vry large icicle against the house and has damaged our wood siding. When we plugged...

Hello Jmranes,
It sound to me like your getting alot of condensation on your exhuast pipe and a weep hole was drilled to "BAND AID" the issue. These is not how 90% plus furnaces are installed. If you are referring to the outside intake and exhaust PVC piping, then there shouldn't be any weep holes. When the furnace is properly installed, the furnace comes with a condensate kit (refer to owners manual) that is mounted on the side of the furnace and all the condensation that collects overflows and should be piped directly into a floor drain. As for the intake and Exhaust for side discharge application, the Exhaust PVC pipe should come out through the side of house and immediate goose neck up (90 degree) with a straight piece of PVC pipe about 2' to 3'...

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This type of pipe is mostly used for hot and cold water distribution, as well as being regularly used in HVAC systems for refrigerant lines. Although once used in gas piping, this is no longer allowed in most jurisdictions.

Copper piping works in both underground and above-ground applications, but copper can be affected by some soils and should be sleeved if used underground. Due to the price of copper and longer labor needed to install, many builders are switching to alternative water... distributions piping, such as PEX.

Copper comes in different thicknesses which are labeled M, L, and K. M is the thinnest grade of copper. Copper can be connected in different ways, including compression fittings or with a torch so you can sweat solder it....

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topic 27151

Q. I am an artist and my husband is a residential designer. We have galvanized pipes now and are going to replace them, due to little water pressure. What is safest, copper or CPVC (chlorinated poly vinyl chloride) for plumbing a house? I read that PVC will leach toxins. How is PVC different from CPVC and what might be the advantages over copper. How do they differ in price?


Bellskye Thomas
artist - College Park, Georgia

Copper pipe (courtesy madeinchina.com) - PVC pipe (courtesy prettyhandygirl.com) - CPVC pipe (courtesy Flow Guard) - PEX pipe (courtesy pex-plumbing.org) - PPR pipe (courtesy extruder.com.cn)

A. I am interested in why you want to change from galvanised pipes to copper or CPVC "due to little water pressure". I cannot see how changing the pipes will alter the water pressure, unless the pipes are blocked with chalk or something.

Anyhow, firstly, CPVC is "chlorinated polyvinyl chloride" - it is a "polymer"...

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[Summary]Home Improvement & Remodeling : How to Fix PVC Water Pipes If a PVC water pipe is damaged, the cut section needs to be removed and replaced with a new section that is glued into place. Learn about using PVC primer and PVC glue to fix PVC water pipes


Home Improvement & Remodeling : How to Fix PVC Water Pipes

If a PVC water pipe is damaged, the cut section needs to be removed and replaced with a new section that is glued into place. Learn about using PVC primer and PVC glue to fix PVC water pipes with help from a certified home inspector in this free video on water pipe repairs.

Expert: Mark Blocker
Bio: Mark Blocker has more than 30 years experience in residential carpentry, construction and home inspection.
Filmmaker: Daron Stetner

3 Ways to Repair PVC Irrigation Pipe

Repair PVC irrigation pipe using a new product, the flexible coupling, or a compression coupling, or a...

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PVC pipe is commonly used by plumbers and DIY enthusiasts because of its reasonable price, durability and ease of use. Water supply and wastewater lines can both be made from PVC pipes. Usually, PVC is trouble- and maintenance-free once it’s installed. Occasionally a pinhole leak or larger leak can occur and, when it does, you have some options of how to remedy the situation.

Why the Leak

The first question you need to address is why is the pipe leaking. PVC pipe doesn’t just “wear out.” The water inside the pipe may have frozen and expanded, causing the leak. Or something rubbing on the pipe externally wore it thin in a spot. The leak may come from a joint, indicating the joint may have been incorrectly installed. Identify the problem and ensure that it can be eliminated after you make the needed repair.

Tape It

With a drain line that doesn’t carry pressurized water, you can fix a leak by taping the hole with plastic tape. Eventually, you should...

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The copper plumbing lines in the house we bought last year have started to develop pin-hole leaks. Many of the solder joints are discolored. I thought copper was the best you could do for plumbing. So what's the problem here and how should we deal with it?

Copper is indeed the gold standard for plumbing -- or at least it used to be.

Copper is relatively easy to work with. And copper doesn't rust, unlike galvanized steel pipe, which you'll still find in some older homes.

That made copper the first choice for residential plumbing systems for many years. In its day, copper was even used for drain and waste lines -- a category now the domain of PVC pipe.

But copper isn't perfect. Besides being more expensive to buy and more time-consuming to install than some of its competitors, copper can be damaged by several common conditions in water and soil.

And as a result, newer forms of plastic pipe are gaining popularity among both do-it-yourselfers and...

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What Causes Copper Pipe to Leak?
(pipe failure)

Contrary to popular belief copper water piping doesn't last forever. In its original design criteria, copper piping was projected to last for 20-25 years, but failure can often occur in as little as two years due to water chemistry.

Changes in water chemistry, unrelated to water quality, have caused the water to become aggressive towards the copper piping.

Copper is the most widely used material for plumbing systems because of its ease of use, resistance to corrosion, and resistance to permeation by liquids and gases, which may be sources of corrosion and contamination.

Copper piping has been used for domestic water supply for over 50 years. Since 1963, over 5.3 million miles of copper plumbing tube has been installed in about 80 percent of all U.S. buildings.

Hot or warm spots in the floor, soaked carpeting, ceilings or walls and abnormally high water bills are signs of failing copper...

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Q. In the past year I've had three pinhole leaks in my copper water pipes. My insurance company has refused to pay any more claims for damage caused by leaks, and the cost to repipe my house is more than I can afford. When I asked my plumber why these leaks keep happening, he didn't have a definite answer. I thought copper piping was supposed to be good quality. Why do these leaks keep happening?

A. As copper plumbing becomes old, pinhole leaks become increasingly common. The primary cause for this, however, is not merely aging of the pipes, as we shall see. Unfortunately, pinhole leaks in copper pipes typically occur in places where they are not observed until there has been significant water damage and mold infection. Plumbers have varying explanations for these leaks, but several causes are widely recognized within the industry. The three most common of these are chloramines in municipal water systems, particles of corrosion from aging water heaters, and high water...

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