Do you own an outdoor sauna or a sauna in general? If so, you might’ve noticed how easy it is for moisture to build up in those warm, humid environments. While that’s perfect for your relaxation, it’s also a paradise for mould. Mould thrives in damp spots, and without regular care, it can creep into your sauna, causing not just damage but potential health issues.

This guide will show you how to keep your sauna mould-free, so you can enjoy your peaceful retreat without any nasty surprises.

Why Mould Forms in Saunas

Mould grows best in environments where warmth and moisture are abundant—basically, your sauna’s ideal conditions. Saunas, especially outdoor ones, tend to trap humidity after each session. Without proper ventilation, this moisture lingers, creating a perfect breeding ground for mould to thrive.

Mould loves to hide in crevices, on wooden surfaces, or even on accessories like cushions or towels that might not dry out properly. If your sauna isn’t regularly cleaned or maintained, it doesn’t take long for mould to settle in and start spreading.

Signs of mould can be as obvious as visible black spots on the wood or as subtle as a musty smell. In some cases, you might not see it at all until it becomes a full-blown problem. That’s why understanding the conditions that lead to mould is key to keeping it under control.

Prevention Methods to Keep Mold Away

Keeping your outdoor sauna free from mould is all about prevention. A few simple steps can make a world of difference in keeping moisture levels in check and preventing that dreaded mould growth.

Proper Ventilation

One of the most effective ways to prevent mould is by ensuring proper airflow. After each sauna session, leave the door open for a while to let the steam escape. If your sauna has vents, make sure they’re open to allow air circulation. Ventilation is crucial because mould loves damp, stagnant air.

Letting fresh air in after each use dries out the space and makes it less appealing for mould to grow.

Regular Cleaning Routine

A good cleaning routine is essential for keeping mould at bay. Wipe down the wooden benches and floors after each session to remove any moisture. Use a non-toxic cleaner, preferably something natural like white vinegar, to disinfect surfaces without harsh chemicals.

Make sure to regularly wash any towels, cushions, or mats you use inside the sauna as they can absorb moisture and contribute to mould growth if left damp.

Monitor Humidity Levels

Keeping an eye on the humidity inside your sauna can help you manage moisture effectively. You can invest in a hygrometer to measure the humidity and aim to keep it below 60%. If the levels start creeping up, consider installing a dehumidifier or simply airing out the sauna more frequently. The goal is to prevent the kind of lingering moisture that mould thrives on.

Seal Gaps and Cracks

Small cracks in the wood or gaps in the sauna's structure can let in moisture, creating hidden spots for mould to grow. Make it a habit to inspect your sauna for any cracks or gaps, and seal them up when necessary. A quick fix with some wood filler or a sealant can prevent water from sneaking into places you can’t easily clean.

Best Sauna Maintenance Practices

Regular maintenance is your best defence against mould. By keeping up with these simple practices, you can ensure that your sauna remains a relaxing space and not a breeding ground for unwanted mould.

Use Mould-Resistant Materials

If you're in the process of building or renovating your sauna, consider using mould-resistant materials. Certain types of wood, like cedar or hemlock, are naturally resistant to mould and decay. They’re also popular choices for saunas due to their durability in humid environments.

Investing in these materials might cost more upfront, but they pay off in the long run with less hassle from mould.

Wood Treatment and Care

Wood is a key material in saunas, but it's also porous, meaning it can absorb moisture if not treated properly. Regularly oiling or sealing the wood can help create a protective layer that repels moisture. Use products specifically designed for sauna wood, and avoid any harsh chemicals that could damage the wood or affect the air quality inside your sauna.

A little upkeep with wood treatment can go a long way in preventing mould.

Towel and Cushion Care

Any fabric left inside a sauna, like towels or cushions, can hold onto moisture long after you’ve finished your session. It’s a good idea to remove them from the sauna immediately after each use and hang them to dry in a well-ventilated area. Wash them frequently and make sure they’re completely dry before bringing them back into the sauna.

This prevents moisture build-up and reduces the risk of mould forming on your fabrics.

Leave the Door Open

One of the simplest yet most effective tricks is to leave the sauna door open after each use. This lets fresh air in and moisture out, ensuring the interior dries out thoroughly between sessions.

It's a habit worth forming because it reduces humidity and keeps the air flowing, which is exactly what you want in mould prevention.

How to Remove Mold from Your Sauna

If you’ve spotted mould in your sauna, there are a few steps you can take to remove it safely and effectively.

Here’s what to do:

• Safe Cleaning Products:

  • Use white vinegar and water (equal parts) as a natural cleaning solution.
  • Avoid bleach—it’s too harsh for the wood and may cause damage.
  • Spray the vinegar solution on the mould, let it sit for a few minutes, then wipe clean with a cloth.

• DIY Mold Removal Techniques:

  • Create a paste with baking soda and water for tougher spots.
  • Gently scrub the affected areas with a soft brush.
  • Rinse with clean water after scrubbing and allow the area to dry.
  • Repeat the process if necessary until the mould is fully removed.

• When to Call a Professional:

  • If the mould is deep in the wood or covering a large area, DIY methods may not be enough.
  • Call a sauna maintenance specialist for professional treatment to ensure the mould is fully removed.
  • Professionals can provide long-term solutions if the mould keeps coming back.

Tips for Long-Term Mold Prevention

Once you’ve got your sauna mould-free, you’ll want to keep it that way. The key to preventing mould in the long run is to stay on top of maintenance and manage moisture levels.

Here are some practical tips for keeping mould away for good:

• Install a Dehumidifier:

  • Placing a dehumidifier in or near your sauna can help reduce the overall humidity, especially in more humid climates.
  • Choose a model that works best for the size of your sauna to keep the air dry between uses.

• Routine Inspections:

  • Make it a habit to check your sauna regularly for any signs of mould, even in hard-to-reach areas like corners and behind benches.
  • Catching mould early makes it easier to remove and prevents larger problems down the track.

• Keep Towels and Accessories Dry:

  • Ensure that all towels, cushions, and mats are completely dry before bringing them back into the sauna.
  • After each use, hang them outside the sauna to air out or wash them if necessary.

• Maintain Proper Ventilation:

  • Leave the door open for at least 30 minutes after every session to let the sauna dry out.
  • Make sure any built-in vents are functioning properly to keep air circulating inside.

• Set Up a Mold-Resistant Sauna:

  • If you’re building or renovating, choose mould-resistant materials like cedar or treated wood.
  • Invest in high-quality insulation that doesn’t trap moisture, which can prevent mould growth from the start.

Conclusion

Keeping your outdoor sauna mould-free might seem like a big task, but with the right approach, it’s really just a matter of regular upkeep and a few preventative measures. By ensuring good ventilation, maintaining a regular cleaning routine, and staying mindful of moisture levels, you can easily keep mould at bay.

Whether you’re building a sauna from scratch or maintaining an existing one, taking care of these small details will help you enjoy a clean, healthy, and relaxing space for years to come.

A little effort now can save you from bigger headaches down the track.