A leaking overflow on the tank is a common cause of a faulty ball cock which is also known as a float operating valve part 1 or part 2.
Overflow tank in attic leaking.
Go into the loft and take the lid off each tank.
Take the lid off each tank and check how high the water level is in each one.
In every attic there should be an isolation valve to the tank so there should be no reason to turn the mains water supply of until the emergency plumber arrives to fix the plumbing.
At the very least shingles.
There are normally two but can be virtually any number depending on the size and type of system you have.
Rainy weather causes the first type of leak to be discovered.
The water level in a tank is too high so it is running out the overflow.
Stop the water feed into either of the water tanks by turning the.
These type of water leaks are easy to find but also easy to fix if your good at a bit of diy plumbing.
Flush the toilet to drain the water.
A cheaper way to fixing a float operating valve is by replacing the valve but in some cases as experienced the valve is then weaker and no longer under manufactures guarantee.
To turn the water feed off on a toilet cistern use the isolation valve.
Water leaks occur through roof failure ice dams and water condensation or frost build up inside an attic.
This is a valve located on the water pipe that.
Once done refill the tank with cold water.
Use a flat head screwdriver to turn the screw a quarter turn clockwise.
The most common leaks coming through the ceiling from the attic would be the float operating valve followed by a burst pipe due to the cold or a joint on the pipe work that may of been knocked at some point.
In all cases if you do not know which is the problem cistern then a visual inspection will tell you.