High-Rise Hot Water Pipe Leak Repair

Plumbing in Canadian houses is pretty reliable, but if you live in an apartment building or condo, you probably know from experience that plumbing leaks are much more common. Water systems in high-rise structures operate differently than what’s installed in houses, and this difference leads to an annoying issue. However, I have an up-and-coming solution that I find interesting even though I’ve only ever spent short stints in a high-rise.

epoxy line in eroded hot water pipeMy parents live in a condo, and when I shower during longer visits with them, I’m impressed at how quickly the hot water starts flowing out of taps when you turn them on. That’s because hot water is constantly flowing through main pipes just behind the wall, and as pleasant as this is for those impatiently waiting to get clean, the constant circulation of water creates an erosion problem that’s becoming more and more common.

High-Rise Hot Water Pipe Leaks Inevitable

Constant flowing water eats copper pipes from the inside out, leading to pinhole leaks in areas with internal turbulence. It used to be that after 15- to 25-years of service, more than half of copper pipe wall thickness was gone. For a variety of reasons, dozens of Canadian high-rises have begun to spring hot water pipe leaks when they’re less than five years old.

Two Possible Plumbing Repairs

  1. The usual repair involves patching pipes with strips of rubber and screw clamps, but there’s only so far you can take this. Pipe replacement is the traditional long-term fix for eroded pipes, and though it certainly solves the leaking problem, it’s pretty disruptive to residents. Walls need to be opened, new pipes installed, then drywall, paint and wallpaper replaced. And even when you’re done, if the repair involved new copper pipes, they’re still open to the same erosion process that caused leaks in the first place.
  2. Lining pipes with liquid epoxy is the second option for dealing properly with pinhole pipe leaks, and a process as strange as this made me curious enough to look into the details more closely. This operation retains all existing pipes – weak spots and all – but coats the inner surface with a 2mm to 3mm layer of food-grade epoxy. As unlikely as it sounds, this lining approach strengthens the remaining pipe and fills those weak spots that would have sprung leaks eventually. Pipe lining happened at my parents’ condo this past Christmas, and except for the equipment you’d see stationed here and there in the halls, it was quite painless.

Besides convenience, expected working life of lined pipes is another advantage. There’s no reason to expect replaced copper pipes not to spring leaks again in 10 to 25 years (maybe sooner), while the expected working life of epoxy lining is 40 to 60 years.

eroded copper pipe with epoxy liningI’m always leery about the unwanted substances that water will pick up in contact with synthetics. For what it’s worth, epoxies used for pipe lining meet the world’s strictest safety testing. The fact that it’s only on the hot water side of systems offer another layer of safety, too. Health agencies everywhere always warn against cooking with or drinking water drawn from the hot side of any water system, regardless of what the pipes are made of.

Changes May Be Coming

For reasons I don’t fully understand, pinhole water leaks happen regularly even in single-family cold water supply pipes south of the border. Aggressive water chemistry and high chlorine levels may have something to do with this, and as the Canadian water treatment industry changes, we may be in for the same troubles here. So if pinhole pipe leaks ever happen at your home, you now know at least one non-disruptive way of fixing the problem.

Posted on January 30th, 2012


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