Why would my overflow pipe be dripping?

Hi all,
I’ve noticed that my overflow pipe has started dripping near enough constantly. It is fitted just beneath the roof tiles and has been doing this for a few days now.
Are there any usual causes for an overflow pipe to be dripping? and if so, is it something I can fix myself?
If this is a simple tweak I would much rather fix it myself rather than hire a plumber.

Asked by Akinfolayan on 4th Nov 2019
Expert Trade Answers
"Hi normally this is because of your ball valve in your tank is not shutting off properly it will be either stuck or worn out. Try moving it up and down to see if its stuck and repairs the issue if not its a new ball valve needed. Small work fairly straight forward"
Answered on 10th May 2020 - Member since May 2020 - report
"The overflow pipe dripping is usually from the ball valve in the storage tank not shutting off and causing water level to increase."
Answered on 22nd Nov 2019 - Member since Oct 2019 - report
"It’s likely that the ball valve in the tank in the loft has failed and needs a new washer, however, personally I always just replace the valve as a whole."
Answered on 16th Jan 2020 - Member since Jan 2020 - report
"Your overflow valve will be dripping due to a ball valve or vent dripping into the tank or a valve letting by."
Answered on 5th Nov 2019 - Member since Oct 2018 - report
"Your overflow pipe may be dripping due to a leaking ball valve, or an open vent discharging into the tank."
Answered on 4th Nov 2019 - Member since Jan 2017 - report
"Most common cause for a continuous overflow leak is perished washer in the float valve. If you are unsure of what to do, you would be better off getting a plumber as it should be an easy fix."
Answered on 10th Feb 2020 - Member since Jan 2020 - report
"This is usually due to a faulty float valve not closing fully. Turn off the water at the mains or isolation valve if there is one and replace it. Very easy job. Sometimes they can be repaired but for the sake of less than £10 just buy a new one."
Answered on 13th Jan 2020 - Member since Nov 2018 - report
"Yes the ball valve in the feed and expansion tank might need changing."
Answered on 25th Nov 2019 - Member since Sep 2019 - report
"I would suggest you check your water level in the tank. If this is too high then it's doing its job, instead of flooding your roof space it's going down the overflow. It' possible that the ball valve in the tank itself is not shutting properly causing the fault.

Changing these would require the water to be isolated. There may be videos online showing how to do this but I doubt it, otherwise, call a plumber.

Good luck,
Regards"
Answered on 4th Nov 2019 - Member since Oct 2019 - report
"The ball valve is not shutting off and needs to be replaced."
Answered on 27th Jan 2020 - Member since Jan 2020 - report
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