extend copper line under the slab

Derry · Dec 17, 2011

Hello,

I need to extend a 3/4" soft copper water line under a slab.
I can put a fitting under the slab OR I can slightly bend the pipe so it comes out of the slab in a 2x4 wall.
My question is:
Is it OK to bend a 30 years old soft copper pipe?

Thanks

Derry · Dec 20, 2011

I edited my last post to make it more clear. Any suggestion?

Sponsor · 2022-01-29T12:20:58-0800

hj · Dec 20, 2011

copper

Yes, if you do it carefully. It will be a hundred times better than making joints under the floor.

Derry · Dec 20, 2011

I'll go for that and put a fitting if it breaks...
I found the copper pipe was damaged by the backfill, does anyone know what should I use to protect it? I'm planning to use 2 ft of 3/4" clean stone around the pipe.

hj · Dec 21, 2011

quote; put a fitting if it breaks...

IF you put a fitting it, it either has to be a flared fitting, NOT compression, or brazed, NOT conventional soldering.

Derry · Dec 22, 2011

Thank you HJ!
Do you know if I should wrap the pipe in the backfill and where the slab touch the pipe, if yes what should I use?

hj · Dec 22, 2011

We use the plastic sleeving to protect copper lines.

Derry · Dec 23, 2011

Thanks again HJ. I'll have to wait january for the town to close the water main on the street. It seems everyone has its own view about the fitting under a slab. A plumber suggested to use a corporation fitting (I couldn't see one on the web), he said it's not with brass but with rubber and very strong, the town is always using this, they wouldn't use this if it wasn't reliable since these kind of repairs are very expensive. Anyway I think the best is "no underground connection".

hj · Dec 23, 2011

quote; they wouldn't use this if it wasn't reliable since these kind of repairs are very expensive

1. They are using it on COLD water.
2. They are NOT using it under a concrete slab.
3. They do NOT have to "pay" a plumber to redo it if it fails.

extend copper line under the slab

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