04:52AM | 12/26/04
Member Since: 12/11/04
6 lifetime posts
I have a copper line coming through my slab for water service. Right now the slab is broken up in the corner where the line comes in. I would like to pour new concrete to fill it in. I was told that concrete will eat the copper if directly placed against the pipe, but I've also read that the copper will actually corrode concrete. Which is it? I know of other homes that have concrete poured right against the copper also, and have not heard any complaints. Most importantly, I would like to know if any corrosion will occur, how long would this take to happen.


05:55AM | 12/26/04
Concrete does eat copper and our building and plumbing codes require the copper to be insulated from the concrete. I discussed this in your last post below on Friday.

The amount of time it takes to eat through varies widely. I've seen it last over twenty years and I've seen fail within two years. I don't know why there is a difference. It may be the composition of the concrete or other factors


03:26PM | 08/08/07
Member Since: 08/07/07
2 lifetime posts
Was curious if there was a response to this item regarding unprotected copper plumbing in which a new concrete foundation had been poured directly onto?

Does conrete erode copper plumbing when poured directly onto it during construction?


12:40PM | 08/09/07
Member Since: 01/24/06
1548 lifetime posts
ALL piping passing through concrete EVEN cast iron should be protected by an arch, lintel or iron pipe sleeve.

Copper expands and contracts like most metals and having it rub against concrete is a sure way to have it destroyed

The piping had to be coated to to protect it.

You asked how long it should take to corrode I would figure based on 60 seconds to one min and 60 min to an hour times 24 hours 86,400 times 5 -10 years give or take a few years and the coefficient of expansion per degree of temperature change per in per foot and the type of copper K,L,M, DWV, ACR, or Drawn or annealed and the nominal diameter and the concrete mix and the lime content and the sift of the sand mixture and the thickness.

So a rough guess would be 4 years 8 days 9 hours and 14 minutes and 12 seconds This of course does not take the PH factoring into consideration.

This was one amazing Question


03:24PM | 08/09/07
Member Since: 08/07/07
2 lifetime posts
The home in question was our first "new" home is about 3 1/2 years old. 11,000 in damages by the time the slab was busted open to find and repair the leak, replace carpeting and laminates, baseboard, bathroom tub and tiling. a real nightmare.

thanks again!


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