Type M Cu For Hot/Cold Water Lines Question
Live in a 35 year old house outside of Boston.
Had a leak in a Copper water pipe that the plumber finally found.
Unfortunately, I forgot to ask him if it was in a hot or cold line, as this might, perhaps, be meaningful ?
Anyway, what surprised me was that it was pinhole leak in the middle of a run.
Not at a joint or fitting, etc. Right in the middle of a line.
Apparently they used the thinnest Copper they could find when they built the place.
I used a caliper on it, and found it to be 0.028, which I guess is a grade M. (outside diameter of 5/8 inch)
But, it still should take the household pressure without any problem, I would think. True ?
The plumber replaced it with heavier wall stuff of approx. 0.038, which is probablyType L
a. 35 years ago, was this (Type M) a "very common" Copper gage they used for household hot and cold water lines ?
b. Is it still allowed, or the Codes prohibits it now all over ?
c. What might make a pinhole leake in the middle of a clear run ?
I guess the pinhole can be considered as a corrosion type of breakthrough.
d. How common is something like this is the thinwall Type M tubing ? What causes ?
Any thoughts on this would be most appreciated.