What causes green spots on pipe like this?

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Old 11-19-17, 09:04 AM
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What causes green spots on pipe like this?

This is under the bathroom floor. Is this from freezing?
 
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Old 11-19-17, 09:25 AM
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Water on copper causes the green.
If there is nothing dripping on that pipe.... it looks like it may be rotting.

The pipe can corrode from the inside out in the presence of heavy minerals.
Is that the only place where it looks like that ?
 
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Old 11-19-17, 11:57 AM
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Yes that's it. This is city water and most pipes in the house do not look this way, and they're all the same age.

To be clear, it would not rot from the inside out, correct? Only if water was externally getting on it?
 
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Old 11-19-17, 06:13 PM
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Just coated it in some Rustoleum flex rubber stuff for now until I can fix it next year.
 
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Old 11-19-17, 06:40 PM
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You need to re-read what I posted. It CAN corrode from the inside out.
 
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Old 11-19-17, 09:47 PM
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In heavy minerals... but what about town water that is treated?
 
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Old 11-20-17, 11:07 AM
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In my opinion, the spot on the left looks exactly how pinhole leaks in copper pipe look. I bet if you took a knife to it and scraped the oxidation off, you'd probably find yourself with a leak (I don't suggest testing it unless you're ready to replace it).

There's a lot of conflicting theories about what causes pinhole leaks in some copper pipes and not others... as Pjmax said, it usually has to do with certain minerals and/or pH of the water. (sometimes)

It could also have to do with that length of pipe and a manufacturing defect however many years ago. Keep an eye on it. It may be years and years until it starts leaking (if it ever does), or could start next week.
 
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