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Reaccurring Pinhole leaks

Friend's house is 6 years old. For the past 2+ years he has had to replace the plumbing around the hot water heater as well has continuous pin hole leaks that keep popping up in a +/-20 stick of pipe in the attack that winds around the AC unit and feeds the upstairs bathroom as well as their master bath. He has had either 7 or 8 pin hole leaks in this pipe in the attack. He has had plumbers and electricians come out to the house to look at it and at one time we thought it was because the plumbing wasn’t grounded because they got a really high amp reading. He had another guy come out and did the same thing and nothing, no amps were detected at all. Currently they only turn the water on in the house when they are cooking or bathing, other than that the water is turned off because they just can’t trust it. His master bedroom and bath are missing sheetrock and carpet sections from the last repair a few months ago and he doesn’t want to spend the money to fix it because another leak will happen and he will have to tear it out again.

Re: Reaccurring Pinhole leaks

It sounds like it's type M tubing. But I must say even type M should last longer then six years. I would start by having a water test done. It sounds like he has a real aggressive water condition and is in need of water treatment.


Re: Reaccurring Pinhole leaks

The problem with pin holes is, that if you get them in one place, you'll get them in other places too, and fast.

Tell your friend to: first test the water as John said, then repipe with type L copper.

Won't be cheap.

Re: Reaccurring Pinhole leaks - Other things to check.

Here are some other places to look for your problem. While agressive water may be the cause, there are other places to look.

Do you have a softener? If so, and it is set to zero or close to zero hardness, it may be making the water agressive. See if you can run the finished hardness at about 8 - 10 grains.

Do you have any type of an alarm system. If they grounded the alarm system to the water pipes, the d.c. current from the alarm can attack copper.

Anything else using the water pipes for a ground? Lighting, washer, dryer, doorbell? Take it all off and run ground wires.

Do you have a ground rod? If you whole house is grounded to the water pipe by your meter, is it jumpered across the meter? Appliances attached to the water pipes in the house need a connection to ground, if the meter fittings are not installed prolerly they may insulate the house from the ground. There should be a jumper wire around the meter. A ground rod is better.

Is the water heater plumbed correctly? Do you have a bi-metalic connector on each water line? If not you need them.

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