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do pex joints ever leak a few days later

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do pex joints ever leak a few days later

Old 06-14-2019, 07:24 AM
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Default do pex joints ever leak a few days later

I have seen a few larger new construction homes/offices on rare ocassions leak when a copper ( 3/4 inch usually) water piping joint was overlooked when sweating the joints but somehow did not leak when first pressurized.
But leaked later.

Any similar problems with pex?
A friend just did about 20 or 30 joints under his house when he rerouted a hot water recirculation system. How often should he leak check it and for how long?
I think he used a new crimp tool, and he is not a plumber. but sometimes the pros have boo boos also?

Last edited by edwardh1; 06-14-2019 at 07:40 AM.
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Old 06-14-2019, 07:49 AM
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Not an expert on PEX but I recently used it to plumb a hunting cabin. I had one small leak. When I examined the crimp I saw my mistake. Put on a new crimp and the stuff is working fine for over a month. I think the crimp either works immediately or it doesn't. Not sure how it would spring a leak later.
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Old 06-14-2019, 08:05 AM
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No clue on PEX but they pressured my copper system for over a week before hooking up the water. The also inspected each joint to make sure nothing was missed.
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Old 06-14-2019, 08:24 AM
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Once he's bled all the air out, and has the city water turned on, I'd check once or twice for a couple of days. Whenever I've used it, I give it about 24 hours as a precaution but that's probably overkill. A properly crimped joint/fitting shouldn't leak, period.
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Old 06-14-2019, 09:42 AM
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I have about a dozen PEX connections done by a plumber. Been about 5 years, no leaks that I know of.
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Old 06-14-2019, 09:50 AM
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I redid my entire house in pex. Also I have done many renovations. Not a single leak.
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Old 06-14-2019, 10:12 AM
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Every new house my rule is main water valve on only while people are working there for the first week minimum after plumbing fixtures or sprinkler system are connected.

Ive had PEX leaks that were found days after water was turned on because it took days for the tiny drip to work its way through Sheetrock untill it became visible. I also had a pex connection(compression non crimp) going in to the Manabloc manifold blow off 18 months after work was completed with no leaking up to that point. Lucky the homeowner happened to be home at the time so no damage.

the crimper should come with go/no go gauge to check your work if it’s the copper ring kind
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Old 06-14-2019, 10:15 AM
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Iíve remodeled a kitchen and master bath with pex. No leaks. The key is to use a quality crimper and rings and verify your connections with a go no go gauge.

As well as pressurize your system before buttoning everything up. That goes without saying. I would avoid the shark bite stuff to transition from copper to pex. Have not heard good things about those fittings.

https://www.pexuniverse.com/how-to-go-no-go-gauge-work

edit: sorry I typed slower than the previous poster.
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Old 06-14-2019, 10:20 AM
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I go under my house about every 6 months just to check on things. It does help that I can almost stand up under my house.
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Old 06-14-2019, 10:27 AM
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Originally Posted by bjm9818 View Post
Every new house my rule is main water valve on only while people are working there for the first week minimum after plumbing fixtures or sprinkler system are connected.

Ive had PEX leaks that were found days after water was turned on because it took days for the tiny drip to work its way through Sheetrock untill it became visible. I also had a pex connection(compression non crimp) going in to the Manabloc manifold blow off 18 months after work was completed with no leaking up to that point. Lucky the homeowner happened to be home at the time so no damage.

the crimper should come with go/no go gauge to check your work if it’s the copper ring kind
You reminded me of my second house. New construction, after we lived there for 2 years, we saw a wet spot on the first floor kitchen ceiling, directly under an upstairs bathroom. Ah, crum...

Turns out the person who installed the kitchen ceiling drove a sheetrock screw right into a cold water supply line for the upstairs bathroom. It took 2 years for that to start leaking. Seems every home I've ever lived in has had some kind of problem because a nail or screw was driven into something running inside a wall. The most exciting one was when a nail shorted a 120 VAC hot wire to the shield on a TV cable!
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Old 06-14-2019, 10:33 AM
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The PEX out to my pier has never leaked at the fittings. However, I have had some dry rot issues that led to splitting over the winter. Some pieces have been in place since 2009 with no issues at all.
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Old 06-14-2019, 10:52 AM
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My RV is nothing but PEX. It froze numerous times last winter before I figured out how to fix it. Its been over a year and zero leaks. It did crack my water pump housing though, nothing to do with PEX.
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Old 06-14-2019, 10:58 AM
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When I used to build homes, I had two catastrophic PEX leaks that occurred several weeks after install. One was not noticed until an entire bathroom ceiling came crashing down with wet insulation and drywall and the other flooded the entire house overnight. They were both crimp connections. I have had zero failures with the heat shrink clamps and am a pretty big fan of them.
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Old 06-14-2019, 03:57 PM
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My buddy used pex in his house.. been 10-15 years now... Every two months or so, there is a new leak..... He's considering redoing all the fittings...
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Old 06-14-2019, 04:01 PM
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Pex fittings are pretty bullet proof with the go no go guage and new tools and material. I haven’t had any problems knock on wood.
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Old 06-14-2019, 04:09 PM
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I was a plumber for five years right after high school and have continued to do occasional side jobs. I plumbed my house with PEX fifteen years ago and have had zero leaks, in fact I have yet to have a PEX fitting leak.

I have always used brass fittings and SS bands. A good quality crimping tool is important, and if it is cold out it is a good idea to warm the fittings a little bit with a heat gun after crimping.

The sharkbite fittings are junk. Using an expanding tool with PEX bands works but the tools are finicky. Iíve never used the copper bands, so I canít speak to them. Plastic fittings used with bands are an accident waiting to happen, the elbows can break at the inside radius. Cheap cast brass fittings can also do this, the machined fittings are much stronger.

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Old 06-14-2019, 04:32 PM
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I hate pex pipe for one reason it looks like shit until the walls are closed up. Properly installed copper looks so much better. With that said in the past 15 or so years that Pex has been around Iíve only had two seen two failures. Both were user error. Never crimped one failed immediately unfortunately the other one held long enough in a kitchen ceiling for us to install cabinets, soffits and countertops before it let loose in the middle of the night.
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Old 06-14-2019, 04:43 PM
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Never had one just "Let Loose" the tool I use has a feel to it

If it does not feel right something is wrong ...
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Old 06-14-2019, 05:22 PM
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Originally Posted by Tommysmicroskiff View Post
Never had one just "Let Loose" the tool I use has a feel to it

If it does not feel right something is wrong ...
never said a properly crimped fitting let loose. It was never crimped held pressure for a few then let go. It was never crimped.
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Old 06-14-2019, 05:57 PM
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As a plumber I see a lot of service calls on the cheaper grade pex that commonly us a crimp ring of some type or another. (the box store pex, there is a difference) On my own installs I use cold expansion type pex aka know as uponor and pex rings. I will not install any other type, it has proven itself to me and have had zero issues with it. If this product fails it was install incorrectly.
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