Is there something to line a toilet tank so it does not sweat?

Liz Daugherty
by Liz Daugherty
We have water from a spring and during the summer is very cold when coming into the toilet tank. The sweating then drips to the floor and the water goes around the base of the toilet. Thanks

  8 answers
  • Gary B Gary B on Jun 23, 2018

    Don't know of an insulation for that but you may want to install a very small fan in that room, leave it on during humid weather

  • Liz Daugherty Liz Daugherty on Jun 23, 2018

    Thank you I will try it.

  • Lisa Lisa on Jun 23, 2018

    You can try stryfoam insulation that they use to insulate basement walls. They come is sheets and can be cut to size. If you check the internet you will see kits that are sold with the styrofoam to be used on theinside of the tank along the walls.

  • B. Enne B. Enne on Jun 24, 2018

    This shows how to install those kits. But in some Big Box stores they are now 1/4 -1/3 the price of a whole new cheaper toilet.

    The 2nd video shows someone using expanding foam. I don't know if you have an extra toilet to use in the meantime.

  • Tom Stuart Tom Stuart on Jun 24, 2018

    Liz, this is a common problem with cold water in a warm humid bathroom. It’s the same as putting out a glass of ice water. You can get a toilet cover which will insulate the tank so it is not in contact with the humid air. Walmart and Amazon have these. Do a Google search for “toilet tank cover” and you will find many sources.

  • William William on Jun 24, 2018

    You can glue 3/4" styrofoam sheets inside the tank. Make sure it's clean and dry. Use construction adhesive.

  • Franklinrawley Franklinrawley on Jun 24, 2018

    there are Styrofoam inserts that you can glue or maybe they have a double stick tape that you put inside the tank. I have seem these and they seem to work.

  • Debra Adkins-Brown Debra Adkins-Brown on Jun 24, 2018

    You can buy an insulation kit made for toilets at just about any hardware or homesupply store. I bought and installed one several years ago and it not only ended the condensation but it saved water. You can make your own with 1/2 inch or less styrofoam and a strong glue like Gorrilla Glue. Just turn off the water to your toilet, flush, and dry out the tank completely. Cut pieces of styrofoam to fit the front, back, sides, and bottom of the tank making sure all the plumbing parts will have enough clearance. Then glue the styrofoam inside. Leave it to dry for at least overnight before turning the water back on.

    You can get one of those styrofoam boards that kids use for science exhibits at the dollar store and even glue two together if you feel you need to but one layer should be enough. That will save you quite a bit over what I paid for the kit.