Green CH pipe

Bargain Bucket · 16 Jan 2021

I have the floorboards up and have noticed one length of CH pipe that is thick with green crust along it's entire length (It's about 2m long, between two compression joints). Its as dry as a bone so no abvious leaks. Do I need to be concerned and replace it?

KenGMac · 16 Jan 2021

No and no.

Copper will become green.

Copper turns green because of chemical reactions with the elements. ... Just as iron that is left unprotected in open air will corrode and form a flaky orange-red outer layer, copper that is exposed to the elements undergoes a series of chemical reactions that give the shiny metal a pale green outer layer called a patina, as seen on major buildings, Churches Etc where the copper external dome changes colour

Ken.

JohnD · 16 Jan 2021

indoors? a "crust" sounds odd all the way along the pipe. It's more common at a joint, from flux or a water leak.

I like to clean it off with a green nylon scouring pad and wipe off with a damp cloth.

If, in future, it comes back, that indicates an active leak and is easy to spot.

Maybe Ken gets more industrial pollution, but my copper pipes, indoors or out, just patinate to dark brown, like an old penny.

Nige F · 16 Jan 2021

Bargain Bucket - would you post a pic? I'm with JohnD -never seen verdigris like yours on an inside pipe.

Bargain Bucket · 17 Jan 2021

Will do. Might take a day or so as my I did my back in last night (recurring problem as I get older).

Bargain Bucket · 24 Jan 2021

As requested, here's the green pipe.

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Green CH pipe

Bargain Bucket

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JohnD

Nige F

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