Toilet Tank Question

If a toilet tank is over sweating on the outside of the tank to the point of the floor having to be mopped up every day, is this a sign that the styrofoam liner on the inside has to be replaced? If so, is it worth it to replace the liner?
All the other mechanics inside the tank seem to be in good shape and the level is setting itself correctly (not leaking over the liner).
Anyone replaced the liner before with success?
Thanks Andre
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Andre Denis wrote:

More likely, the tank is "running". That is, water is leaking past the flapper into the bowl and fresh *cold* water is constantly entering the tank. Put food dye in the tank and see if it appears in the bowl.
One other possibility is excess humidity in the house. One lady complained of tank sweating; found that her new furnace had a humidifier but no humidistat! Thing was on all the time.
Jim
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Thanks Jim
I tried putting some food colouring in the tank first and left it there for a couple of hours. There doesn't seem to be any leakage at all into the bowl. No colour at all moving into the bowl until flushing.
It seems the problem may be created by way of your other suggestion, humidity in the air from our new furnace. We had a new furnace installed a couple of months ago. I kept the humidifier running (probably way too much) so that our windows are also dripping. I turned the humidifier off all together a couple of days ago and this has reduced the window and toilet tank condensation significantly.
The tank that was sweating was in a small room with the door closed most of the time and the heating duct no more than four feet from the tank.
Thanks for the help Andre
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Andre Denis wrote:

giveit a try??? dont know if it will work or not but pretty cheap fix if it does..... just make sure it stick OK so chunks dont go down the hole.
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None of the toilets in our house have or have ever had a styrofoam liner, and they don't sweat. Are you in an area with really high humidity? I'm a bit baffled.
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Leaking flapper valve.

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