Why would my overflow pipe be dripping?

Question

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.

Carl · Accepted Answer

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

Simon · Answer

The overflow pipe dripping is usually from the ball valve in the storage tank not shutting off and causing water level to increase.

Dean · Answer

Your overflow valve will be dripping due to a ball valve or vent dripping into the tank or a valve letting by.

James · Answer

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.

Paul · Answer

Your overflow pipe may be dripping due to a leaking ball valve, or an open vent discharging into the tank.

Paul · Answer

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.

Lee · Answer

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.

Paul · Answer

Yes the ball valve in the feed and expansion tank might need changing.

Matt · Answer

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

Martin · Answer

The ball valve is not shutting off and needs to be replaced.

Why would my overflow pipe be dripping?

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