Over flow pipe leak

Question

So I own a first floor flat and each flat has our own water tank, the flat below mine has a large wet/damp patch on their wall around their tank over flow pipe, they informed me that the plumber could not find any issue with their water tank and that they could see it was coming from my overflow pipe, I had a plumber over straight after that who repaired the ball cock, but about a week later I notice the wall was wet again and it looked like drops of water were coming out of their overflow, I’ve had my plumber back again who checked my area thoroughly including my bathroom and said there were no issues in my flat and he said if it was ever my overflow pipe then my wall would have been wet too which it isn’t. We’ve had a lot of rain over the last couple of weeks too so would this be keeping the wall wet, it looks really bad and the wall is starting to go black but I don’t know what else to do?

Sebastian · Answer

May have a water pressure issue and its putting water into the tank which is then being discharged through the overflow pipe

Darrell · Answer

Rain will wet the entire wall. leaking pipework will be more concentrated.
My guess is that your neighbour has an incorrectly fitted tap or mixer valve.
Causing back feed. which then back fills the tank causing it to overflow periodicly

Michael · Answer

Probably damp . check tanks. Outside walls guttering etc.

Luke · Answer

Without seeing your tank ect but based  you saying you had the float valve replaced and plumber could not find an issue similar story down stairs

I would guess that a pressure relief valve is discharging extra water into the tank causing it to come out of the overflow pipe

And this is why it's not happening all the time

Get someone to adjust the level at which your tanks ball value stops the  water flowing into your tank (lower the level) so that there will be more space between the water level and the overflow outlet  
Then if extra water enters this should hopefully help trail and error or fit a larger tank same effect 
Or check the water pressure and adjust the pressure if possible 
But if your pipes are fine you ball value is fine and it's intermittent then it's a water pressure issue and a water relief valve causing the problem
As for the black mould mould remover cover area with plastic sheeting until issue is resolved

Saroosh · Answer

Given the situation you've described, where the flat below yours has a wet/damp patch around their water tank overflow pipe, it seems there might be a persistent issue that needs further investigation. Here are some steps you might consider:

Collaborate with the Neighbor: It's helpful to maintain communication with your downstairs neighbor. Working together to solve the issue can lead to a quicker resolution. They might have more observations or insights that could assist in identifying the source of the problem.

Professional Inspection: Consider hiring a different plumber or a specialist in water leakage detection. Sometimes, pinpointing the exact source of a leak requires specific expertise or tools. A professional with experience in leak detection might be able to identify the source more accurately.

Building Management or Homeowners Association (HOA): If your property is part of a managed building or governed by an HOA, report the issue to them. They might have protocols in place to handle water leakage problems that affect multiple units.

Weather Conditions: While heavy rain could potentially contribute to the dampness, it's essential to verify if the issue persists during dry weather too. If the problem continues even in dry conditions, it might indicate a more significant underlying issue.

Mold or Water Damage Specialists: If the wall is starting to show signs of blackening, there might be a risk of mold growth or structural damage. It could be beneficial to consult with specialists in mold remediation or water damage restoration to assess the severity of the issue and prevent further damage.

Persistent dampness leading to blackening of walls isn't just an aesthetic issue; it could indicate a more significant problem that needs prompt attention. Continue pursuing the matter until the source of the leak is definitively identified and resolved to prevent any further damage or inconvenience to both your property and the neighboring flat.

Tony · Answer

It the vent pipe causing heat steam dome the heating 
Common problem 
Vent pipe needs extending if possible
Could also be problem with boiler overheating

Jipson · Answer

Probably one of the pipe {main/ hot /supply/waist} have leak , need to investigate properly ,

Tomas · Answer

it is possible that there is water coming from the roof, it should be checked more seriously

Philip · Answer

I would check guttering if close by, or you could have damp in cavity wall.

So I would get someone to look at guttering and wall cavity if sign of damp.

Possibly Could be ball valve vibrating causes a wave effect and causing leaking joint to ball valve.
If your covered by British gas or dyno

Dyno use pushfit fit that occasionally washer, olive or fibre washer might need changing.

Hope some of these might help.
Give you an idea.

Over flow pipe leak

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