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Author:
gmum (IL)
I noticed the main water supply into my house enter thru cement foundation. I can tell a portion of this pipe has developed green corrosion on the outside of the pipe about an inch where it enters the foundation thru a caulk type material...... and then it has turned to black which you can scratch off down to bare copper.... I assume this is all from outside moisture.
So it got me to thinking, is this green corrosion harmful?
Is it normal for a pipe in contact with moisture/ground to turn colors like this?
Im thinking of sanding it off and see if it reappears but I am afraid to touch the pipe.
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Author:
Paul48 (CT)
They are both stages of copper oxidation. If you leave it alone, it's probably good for another 75 years, or so.
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Author:
gmum (IL)
So this corrosion is a normal thing?
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Author:
packy (MA)
remember, they bury that pipe and it is subject to a heck of a lot more corrosion underground than in your basement. don't worry about it..
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Author:
gmum (IL)
I didn't know if they sleeved underground copper or not. In the few places I have lived I don't think I have ever seen a sleeve even where it goes thru cement.
Now I have dug around outside and found a gas line once that had a rubberized coating, I assume that was copper under it.
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