The slowest leak ever

Joined
21 May 2003
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United Kingdom
Under my lounge floor is pipework feeding the rads. There's one section which has quite a few joints and junctions, and recently a section of pipework was replaced. In doing so, an existing joint neaby (part of a copper tee junction) must have been disturbed slightly, and is leaking - or more like weeping. I'm currently checking it weekly - and it's damp, but barely a drip below in the pot I've put there.

If it was anywhere else, I'd forget about it. But because it's in my lounge floor, with downstairs neighbours to consider, I'd like to know for sure that it's sorted. I'd also as I'd like to put the floorboards back and all our furniture back into place! I'm just worried that getting someone in to replace or reseal that junction will disturb yet another one in the surrounding pipework.

What are the options? Are there any plumber's tricks of the trade that could work here? The joint has already been tightened as much as the last plumber dared. Could it seal itself in time?

Cheers for any suggestions.
 
Assuming this is a compression joint, dismantle it and reassemble adding jointing compound :idea:

Better still, as it's inaccessible, cut it out and replace with a soldered joint.
 

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