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Old 07-15-2011, 02:19 AM   #1
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Sweating Toilet Tank


I have a sweating toilet tank in the basement and upstairs, but the one downstairs is really bad. There's water all over the floor due to it.

I've setup a dehumidifier in the basement to help with condensation, and added a higher CFM bathroom fan to get rid of water vapour faster following showers. Is there anything else I can do?

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Old 07-15-2011, 02:20 AM   #2
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Sweating Toilet Tank


Note, I've also checked for a leak into the toilet bowl using dye, but that doesn't seem to be the problem. It would make sense though, assuming that the cold water is constantly filling the tank making it sweat.

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Old 07-15-2011, 07:03 AM   #3
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Sweating Toilet Tank


There are styrofoam insulation kits available for the inside of toilet tanks. They help the problem of sweating. But as suggested, check for leaks, inside and out. If the flapper valve is leaking water from the tank to the bowl, the tank will be constantly refilling with cold water.
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Old 07-15-2011, 07:49 AM   #4
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Sweating Toilet Tank


When the water in the tank reaches room temeperature it should not be sweating. If after several hours of no use it is still sweating you need to check that the flush valve isn't seeping and that the commode is shutting off properly. A seeping flush valve will allow a commode to continually fill with fresh cold water. If it is shutting off and stops sweating after the water warms up, then it is only a problem for a period of time until the tank water warms. Some people run a mixing valve to the toilet supply that allows a small amount of hot water to temper the tank water so it stays above dew point.
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Old 07-15-2011, 08:16 AM   #5
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Sweating Toilet Tank


Are you sure the bathroom fan is venting outside?Is the fan on a timer to keep running for 30 minutes or so after the shower is done? With the humidity in toon town recently is this a recent problem or does it happen in winter also?
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