Moisture-proofing a bathroom requires creating an impenetrable barrier beneath the finishings and ensuring proper airflow. This is achieved by installing a liquid waterproofing membrane in wet zones, sealing all joints, and using mold-resistant materials, moisture-resistant paint, and a strong ventilation system.
How to Prevent Bathroom Condensation & Mould
Steps
Now, let's look at ways to combat moisture for a healthy bathroom.
The Japanese practice of hanging futons and pillows outside to “air out” isn't just traditional — it kills mold and mites that love humid bedding. Wipe down bathrooms after every use. Exhaust fans during showers, wipe tiles and mirrors, keep surfaces dry. Bathrooms are ground zero for household mold.
Rock salt: Place bowls of rock salt in damp areas like closets or basements. It draws in moisture and requires no energy. Charcoal briquettes: Like rock salt, they absorb humidity and can be placed discreetly around the home.
Waterproof Paint & Sealants
If your wall is flat, mold-free, and in reasonably good condition, a waterproof paint or sealant can make a huge difference. This solution forms a barrier against water infiltration - and it's much cheaper than adding tile or a separate membrane.
Avoiding common basement waterproofing mistakes can save you time, money, and frustration down the road.
Keeping a bathmat outside of your bathroom is an elegant solution. They will absorb the excess moisture from your feet. If you are opting for floor mats then go for mats made up of microfiber, cotton, and memory foam. Even a PVC mat option is also available in the market.
Install an Exhaust Fan: The most important fitting in a windowless bathroom is a good-quality bathroom exhaust fan. Investing in a quality model here will remove steam and excess moisture from the air and circulate the air for good flow.
Sometimes, humidity or dampness (water vapor) in the air can supply enough moisture for mold growth. Indoor relative humidity (RH) should be kept below 60 percent -- ideally between 30 percent and 50 percent, if possible.
A dehumidifier is recommended more for use in the bathroom when your humidity levels are persistently high and the room remains continually humid. However, a bathroom extractor fan is a necessity in any bathroom and the best solution for use during showering, bathing, and for a short time afterwards.
Implementation can be challenging, requiring precise application and suitable conditions. There's a risk of trapped moisture, which can induce mold growth and material failure. Some waterproofing methods limit flexibility post-application, potentially causing structural issues.
Signs of Excess Moisture
Using a Waterproof Primer
The most popular way to waterproof your drywall is to use oil- or latex-based waterproofing primer. These primers are made by most paint manufacturers and are designed to prevent mold and mildew from growing on the surface of your drywall.
Apply a Liquid Waterproofing Membrane
Think of this as your invisible armor. Roll or brush on a liquid waterproofing membrane like RedGard or AquaDefense over the entire floor and a few inches up each wall. 🛡 Must-Have Qualities: Mold and mildew resistant.
Bathroom condensation occurs when warm, moist air produced by showers and baths comes into contact with cooler surfaces, such as windows, mirrors, or tiled walls. This contact causes the moisture in the air to turn into water droplets, also known as condensation.
"The key to preventing mildew and odor on your used towel is to hang it up on a towel rack fully spread out in a well-ventilated area," textile care expert Frej Lewenhaupt explains. "This allows the moisture to evaporate evenly and quickly, which reduces the chance of bacterial growth."
Microfiber. The soft material is often used to clean glasses, phones, and computer screens. Made from polyester, it's water-resistant before a coating is applied. Once the material is treated, it's 100% waterproof.
The average lifespan of a waterproofing membrane depends on the type used, where it's installed (such as bathroom, roof, basement or balcony), and how well it's maintained. As a rule of thumb, waterproofing membranes last anywhere from 5 to 25 years, with premium membranes reaching the higher end of that range.
Here are the top six waterproofing methods in 2025 that can keep every part of your home secure and resilient for years to come.
Waterproof wall panels from Multipanel are a great alternative to ceramic wall tiles. Not only do they provide a 100% waterproof finish, they are much faster to install and are much easier to clean and maintain than traditional tiles.
Installing a Shower Screen or Partial Glass Panel
The strategic installation of a glass panel is the most effective and elegant way to reconcile the doorless aesthetic with practical water containment.
In fact, bathrooms without adequate waterproofing can cause a range of serious problems including rising damp, corrosion of plumbing, compromised electrics, mould, mildew, warping and rotting of a timber floor and structures, and concrete cancer.