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How to Prevent Moisture Under Mattress

When we lay down to sleep in our bed, the last thing we want to feel is dampness and moisture. Many of us have experienced waking up feeling uncomfortable from moisture that has accumulated underneath our mattress. This isn’t only unpleasant but can lead to the growth of mold and mildew if left unchecked.

There are some simple steps you can take to ensure your mattress stays dry and free from moisture. Let’s explore how you can prevent moisture under your mattress and be sure to get a good night’s rest!

Table of Contents

Why is the Underside of my Mattress Moist?

The main culprit behind this moisture is usually humidity in the environment combined with a lack of ventilation around the mattress. If your bedroom does not have proper air circulation, then moisture can build up underneath the mattress. This can cause mold and mildew to grow, which is both unhealthy and uncomfortable.

What Causes Moisture Under Mattress?

Moisture under your mattress can be caused by a variety of factors, and it’s important to identify the source so you can take steps to prevent it from happening again. Common causes include perspiration – when we sleep, our body heat rises and our bodies sweat more than usual, which can cause moisture to build up.

Spillages are another common culprit; if any liquids – whether it be water or something else – are left unchecked on the mattress for too long, they can seep in and cause mold or mildew. Lastly, plumbing fixtures, humidifiers or air conditioners that are leaking, as well as pet urine, can also lead to moisture accumulation under your mattress.

How to Prevent Moisture Under Mattress

Nobody likes waking up in a damp bed, so it’s important to understand how to prevent moisture from building up under your mattress. Here is the easy method you can do.

Reduce Humidity

Reducing humidity in your bedroom can be a game changer when it comes to keeping your mattress dry. To start, make sure you keep window frame and door open to allow for proper ventilation.

If you have an air conditioner installed, use it sparingly as these can contribute to higher humidity levels if used too often. You should also invest in a dehumidifier that will help pull moisture out of the air and collect it in a tank or reservoir.

You also can consider using rugs instead of wall-to-wall carpeting, as carpets can hold onto moisture more easily than other flooring materials. Make sure to regularly clean any furniture or décor that may be collecting excess moisture. 

Increase airflow to the mattress

One of the effective solutions to prevent moisture from building up under your mattress is to increase airflow. The key to this is creating an open space between the mattress and the box spring.

To do this, remove any plastic or fabric coverings that may be trapping in moisture, then place wooden blocks or risers along the sides of the bed frame for added height. This will create a gap that encourages air circulation and prevents moisture from getting trapped.

Additionally, make sure you’re using breathable sheets and blankets that allow for adequate ventilation. Finally, adding a fan near the bed can help draw out any excess moisture in the air and keep your mattress dry. 

bedroom with open window

Increase natural airflow

If you don’t have the option of opening windows in your bedroom, there are still ways to increase natural airflow and help prevent moisture from building up under your mattress. The key is to keep the air moving beneath and around it. This can be done by placing a box fan or two near the bed, making sure they’re pointed away from the bed so that air will flow under and around it.

You can also try using a dehumidifier, which will help to improve the air movement and keep your mattress dry. Make sure you’re using breathable sheets and blankets that allow for adequate ventilation. These simple steps can go a long way towards preventing moisture buildup!

Create artificial airflow

If you’re looking for a more permanent solution to preventing moisture build-up under your mattress, creating artificial airflow is the way to go. A great option for this is to install a fan in your bedroom ceiling or wall. This way, you can ensure that air will always be circulating around your mattress and help keep it dry.

You don’t need to leave the fan running all day – just a few hours each day should be enough – but it’s important to make sure the fan is pointed away from the bed so that air can circulate freely beneath and around it.

Ventilation space beneath the mattress

If you’re looking for a way to make sure there’s enough ventilation space beneath your mattress, then the best thing you can do is make sure your bed frame has slats. By having slats rather than a flat sheet of plywood, it will create just enough gap between the mattress and the underside of the bed frame to allow air to circulate freely.

This will help stop mold from growing and keep your mattress in top condition. To be extra safe, you could also invest in a fan that points away from the bed and leave it running for a few hours each day – this will ensure that any excess moisture in the air won’t settle on your mattress.

Keep the Area Dry

The best way to prevent water vapor from collecting under your mattress is to keep the area dry. This means keeping the room well-ventilated and making sure it’s not too humid. You can do this by using a dehumidifier, running an air conditioner or opening windows if possible.

Additionally, always try to wipe down any spills right away and make sure that you’re not leaving wet clothes or towels on the floor near your mattress. Finally, be sure to use a mattress protector as this will help keep your mattress dry even in damp conditions. 

Check it Regularly

The best way to prevent moisture from collecting under your mattress is to check it regularly. This means checking for any wet spots or damp patches that could be a sign of mold or mildew. You should also look out for any musty odors that could indicate the presence of bacteria or mildew in the area.

If you spot anything suspicious, it’s important to take action right away to help stop the problem from getting worse. If you’re unable to find and address the source of the moisture yourself, then it’s best to call in a professional who can help identify and remove any mold or mildew growths. With regular checks, you’ll be able to keep your mattress dry and free from mold and mildew buildup.

Is it safe to sleep on a moldy mattress?

No, it is not safe to sleep on a moldy mattress. Sleeping on a moldy mattress can expose you to harmful spores that can affect your respiratory system, cause skin irritation and even trigger asthma attacks. Mold can also cause damage to the mattress itself and could result in an increased risk of bed bug infestations. Therefore, it is important to replace any moldy mattresses as soon as possible in order to ensure a safe and healthy sleeping environment.

What can I put under my mattress to prevent mold?

You can use either a mattress pad or an airtight, plastic cover to act as a moisture barrier that will help protect against any kind of liquid or moisture from seeping into the mattress. Additionally, it is important to ensure adequate air flow around the bed by placing it at least 6 inches away from the wall to keep condensation and humidity levels in check. Changing and washing your sheets regularly is also critical – this helps discourage dust mites, which can aggravate asthma symptoms.


When it comes to keeping your mattress dry and free from mold and mildew buildup, prevention is key. You can check it regularly for any wet spots or damp patches that could indicate the presence of mold or mildew.

You can also encourage airflow with open windows or fans, wipe underneath the bed regularly, use a dehumidifier if necessary, and increase ventilation in the area to reduce humidity levels. With regular checks and preventive measures in place, you should be able to keep your mattress dry and safe from unwanted moisture.

Author: Jessica

Jessica is a lover of both life and gardening. She loves to share his passion for both on social media. He often posts about his latest gardening projects, as well as tips and tricks for others who might be interested in starting their own gardens. She also frequently posts about the different aspects of his life that he enjoys, from spending time with friends and family to exploring new places.

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