How to stop a toilet tank from sweating

Toilet tanks in the hot and humid summer months can condensate or sweat, so badly that you may think it is actually leaking. The reason this happens is the water coming into your home is much cooler then the temperature in your home and just like a cold drink on your coffee table, the tank will sweat. The water dripping off the tank can also lead to floor damage, besides being an annoyance. But the solution is not a complicated one, it just costs a little money. You can purchase a toilet tank insulating kit that should solve the problem however if this is not practical for your tank you could also, purchase  a pre insulated tank or install a mixing valve that will add a mix of hot and cold water to the tank.

*If your toilet flapper is worn or your fill valve is not properly adjusted, causing water to slowly trickle to the bowl, this can create  condensation on the toilet tank.

Tools and materials you may require

Installing the toilet tank liner

• Turn off the water to the toilet tank.
• Flush the tank and use a sponge to soak up all the water left inside the tank.
• Inspect the condition of the tank, look for any cracks, build up of sediment or rust and give it a throughout cleaning.
• Allow the toilet tank to dry completely before attempting to add the insulation. A hair dryer can speed this up a little.
• Measure and cut the insulation to size. If the ballcock will be in your way, you can remove it by disconnecting the water supply and removing the nut under the tank.
• Start by applying the adhesive to the large panels and installing them first. Use a liberal amount and spread it out evenly.
• Install the side panels and allow to dry.

Other solutions

• Of course you can always purchase another toilet tank for your model that has insulation pre installed and would be cheaper than hiring a plumber to install a mixing valve.
• A mixing valve can be installed adding hot water to the toilet supply. Although I would not recommend a homeowner to attempt this.
• A water storage tank can be installed to allow the water more time to come up to room temperature, but now we're getting really expensive.