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Compression joints weeping but not obvious why

Discussion in 'Plumbing and Central Heating' started by DAVIESnot, 21 Nov 2015.

  1. DAVIESnot

    DAVIESnot

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    Hello
    I am reasonably competent (but have never soldered). If the two joints in question were accessible I would merely replace. Boring details at the end.
    I darent tighten any further but both are leaking about a pint a week which is tolerable to empty a container every week. I have tried different tapes on the market but accessibility prevents getting a tight wraparound.
    Is there a solution or compound hat I could 'paint' over joint which would improve barrier? I do know this is not ideal, but pragmatic.
    Here are the boring details
    One is underneath plastic pipe into small service tap which feeds shower - hot. Have checked olive by the way. Intact and no debris apparent.
    Second is behind a tall kitchen cupboard and is near main stopcock. It is stopper which effectively changes a soldered T junction to an L bend. I darent tighten or even untighten again because I risk damaging soldered joints nearby ( which I imagine have certain limits before they crack.
    Apologies to anyone who is offended by my suggested solution to my own problems!.
    The main issue really is accessibility.
    When I designed kitchen I obviously left stopcock in reach which it is. Originally the T junction went to the bathroom next door. Then when I redid bathroom I had to redo supply hence the stoper. Boring reason involves fitting a pressure reducing valve elsewhere because of shower mixer. Both joints were originally fone. I test things by wrapping them in tissue for a day. That way I know my joints are fine initially.
    Many thanks
     
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  3. 75pete

    75pete

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    Boss White. Sold by most plumbers / Diy shops
     
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  4. Gas2Air

    Gas2Air

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    Leave it leaking or get someone that knows how to tighten a compression correctly.
     
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  5. DAVIESnot

    DAVIESnot

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    Great answer!
    Could I benefit from your expertise....
    What might I have done incorrectly?
    I know that one common fault is over tightening
    Are there any other common faults.
    Thanks
     
  6. DAVIESnot

    DAVIESnot

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    Thanks 75pete
    A practical suggestion
    ...love looked up the product and it is used on thread while assembling..
    Does anything exist that can be painted over. As I said I darent unscrew one awkward joint because of damage I could cause nearby.
     
    Last edited: 21 Nov 2015
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  8. Aquaheat

    Aquaheat

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    Damage won't be caused to any other joints as you should be holding against while loosening and tightening.

    Reason it is weeping is not easy to say on here but could be due to pipework not being straight and under pressure, not tightened properly in the first place, no jointing compound used.

    Best to take out and remake.

    As for a compound that you can just paint on then no.
     
  9. OwainDIYer

    OwainDIYer

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    If it's potable water then you need Fernox Hawk or similar.

    If it's only weeping slightly then try tightening up just a tiny bit more.
     
  10. stardanny

    stardanny

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    Check that there is no scratch or groove on plastic pipe where the olive sit

    Daniel.
     
  11. oilhead

    oilhead

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    Fernox LS-x or similar ( 'No nonsense' equivalent)
     
  12. Tay7

    Tay7

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    You need to undo the joints and wrap a few rounds of ptfe tape round the olive and then retighten.
     
  13. DIYnot Local

    DIYnot Local

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