I have a cold water tank in the loft, and my overflow pipe drips outside, I think it is because the ball valve may be long overdue to be changed. Is this a reason for the overflow to be dripping. 1) Check if water is dripping out of the valve when it should be shut. 2) If it is then try adjusting the arm to provide more closure force. A modern valve can be adjusted by moving the ball down, an older one needs to be bent downwards *gently*. This may cure it, but is only a temporary fix. 3) Find out what sort of valve it is. There are books and no doubt web sites which will tell you. If it is a type with a washer extract this and see if it is worn, if it is replace. Before doing this turn off the mains water. 4) Complete replacement of the valve may be necessary, but can usually be avoided.

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