extend copper line under the slab

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by derry, Dec 17, 2011.

  1. derry

    derry New Member

    Messages:
    16
    Location:
    Quebec
    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
    Last edited: Dec 20, 2011
  2. derry

    derry New Member

    Messages:
    16
    Location:
    Quebec
    I edited my last post to make it more clear. Any suggestion?
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,607
    Location:
    Cave Creek, Arizona
    copper

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

    derry New Member

    Messages:
    16
    Location:
    Quebec
    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.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,607
    Location:
    Cave Creek, Arizona
    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.
  6. derry

    derry New Member

    Messages:
    16
    Location:
    Quebec
    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?
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,607
    Location:
    Cave Creek, Arizona
    We use the plastic sleeving to protect copper lines.
  8. derry

    derry New Member

    Messages:
    16
    Location:
    Quebec
    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".
  9. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,607
    Location:
    Cave Creek, Arizona
    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.
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