Where's Leaky? Wetness, swelling and white streaks! | UK Plumbers Forums | Plumbers Forums

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Discuss Where's Leaky? Wetness, swelling and white streaks! in the UK Plumbers Forums area at Plumbers Forums

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Combination tank on a raised shelf in a 2 door cupboard. Top cupboard door is jammed shut as it has 'swelled up'. Some evidence of 'wetness' but hard to say where it is coming from but...the ceiling above the cupboard, outside of the cupboard, is showing wet patches. Is there a plumbing equivalent of fluorescent dye used in automotive?
I think it could be
  1. leak from roof into cupboard (obviously nothing to do with plumbing
  2. condensation from header tank
  3. header tank overflow pipe/joint leaking
  4. header tank ball and/or valve worn
  5. something I have no idea about
I'm going up sometime today to have a sniff about!
Cupboard from outside.png
Looking directly up to ceiling in cupboard showing tank.png
White streaks.png
 
Your list of possibilities looks about right to me.

Is there a lid on the header tank? (There should be!) Use a pair of binoculars to check the area of roof above the cupboard for missing/broken/split tiles which are often visible from ground level.

You can get tracer dyes, such as fluorescein, from a merchant or a lot of people use food dyes. I doubt they will help in this case. If people are going to wash in water from the tank after you've added dye to it, make sure you check nobody is allergic. Once you've added dye to the system it'll a heck of a job to get it clean again....
 

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