How Condensation on the Toilet Cistern can Ruin Your Bathroom and how to Avoid it

Bathrooms are hot. When the radiators are off all over the house, there is a good chance that the towel rail in the bathroom is still on. Bathrooms are likewise really damp, it’s what they are for! All of these elements are a recipe for condensation issues.

Include heat and water together and you get humidity. The bathroom is absolutely choc a bloc with humidity!

Add to this heat and humidity an extremely cold surface area such as your cold water toilet tank or the cold water pipes which feed your tank, the bath and the basin.

Your cold water, coming from the mains, is usually between 5 and 20 degrees. Warmer if it originates from a cold water tank in the loft, but nevertheless, much colder than the temperature in your bathroom.

This cold water makes the surface of the toilet tank very cold and, or course, the surface of the cold water taps really cold too. The moment the humid hot from the bathroom strikes the cold surface of the cold pipelines or toilet cistern, it immediately turns to liquid, spilling water all over the flooring. This is called sweating in the trade and you can be sure that in one week alone the tank and cold pipes sweat a fair bit!

There are a couple of methods to stop, or quite minimise, condensation on the toilet tank. The very first is to have plenty of air changes in the room. This is simple if your bathroom has a window; you just open it 2 or 3 times a day.

If you do not have a window nevertheless, you are dependent on the extractor fan to take the hot air (and the smells) out of the bathroom and new air to enter through the door. The new air nevertheless, is simply old air from downstairs. Just as warm and just as likely to condense!

Bathroom extractor fan

We might include some warm water to the tank. That would warm the cistern walls up and minimise condensation– BUT– the pipes included is beyond most DIYers and, if the bathroom is used regularly, it can be quite pricey. The warm water likewise cools down very rapidly when its combined with the cold in the cistern, so very little of a service really.

We might box the pipelines and the tank in and ensure that inside the boxing is a great deal of insulation keeping whatever great and warm so the moisture in the air does not condense. This is a great option where practical but once again, quite pricey.

Boxing in pipework

What can we do? If we cant warm the water up, or change the air temperature level, all we have left is to change the temperature of the tank walls. Why do not we insulate the cistern.

This, it turns out, is simpler than you would envision with using a basic Yoga mat and a tube of Everbuild’s Forever White Sealant.

Simply cut the Yoga mat to the shape of the within the tank, making holes for the flush pipeline and water inlet pipe, stick it to the surface area and let it all dry.

Toilet tank with Yoga mat glued to walls.

When the water is turned on, the yoga mat insulates the cistern but even better than that, a few of the water squeezes up in between the mat and the sides of the tank. This acts then exactly as a wet fit does to a diver. The thin layer of water gets warm and warms the contents of the tank. Condensation is lowered extremely and your bathroom floor is conserved!

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