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Mold is a common issue that many homeowners have to deal with at some point. It looks unsightly and can pose health risks if left untreated. While there are various methods available to eliminate mold, one natural and effective solution often overlooked is sunlight. Does sunlight kill mold? Yes as the UV rays can destroy the mold. The DNA of mold spores becomes damaged and kills the mold.

Let’s learn more about sunlight killing mold.

Sunlight causes the mold spores to become damaged and prevents them from reproducing. It also dries out moisture.

How Does Sunlight Kill Mold?

Sunlight has been proven to be a potent natural mold killer. The ultraviolet (UV) rays present in sunlight have the ability to destroy mold on contact. When exposed to UV rays, the DNA of mold spores becomes damaged. Thus preventing them from reproducing and effectively killing the mold. Additionally, sunlight helps dry out the moisture molds thrive on, making it harder for them to survive and grow.

How Long Does It Take Sunlight to Kill Mold?

The time it takes for sunlight to kill mold can vary depending on several factors. These factors are: the type of mold, the surface it is growing on, and the intensity of the sunlight. In general, mold exposed to direct sunlight for several hours can start to show signs of deterioration within a day or two. However, keep in mind that larger mold infestations may require more prolonged exposure for complete eradication.

Indirect sunlight kills mold too.

Does Indirect Sunlight Kill Mold?

While direct sunlight is the most effective in killing mold, indirect sunlight can still have some impact. Indirect sunlight refers to light that does not directly hit the affected area but is still present in the room. Although it may take longer for mold to die in these conditions, having well-lit spaces can prevent further mold growth. It can also contribute to its elimination.

Are There Disadvantages To Using Sunlight To Kill Mold?

While sunlight is a natural and cost-effective solution for mold removal, it does have its limitations. One disadvantage of relying solely on sunlight is that it may not reach all areas where mold growth occurs, particularly in hidden or hard-to-reach places such as inside walls or under carpets. Moreover, if the mold has penetrated porous materials like wood or fabric, sunlight alone may not eliminate the problem entirely.

Is It Worth It To Use Sunlight To Kill Mold On Items?

Using sunlight to kill mold on items can be a practical and efficient approach, especially for smaller objects that can easily be moved outdoors. Exposing these items to direct sunlight for an extended period can help eradicate mold and prevent further growth. However, for larger items or those difficult to move, alternative methods such as professional mold remediation may be necessary to ensure complete eradication.

Other Recommended Maintenance

Now that you know about sunlight killing mold, let’s take a look at a few other areas of recommended maintenance. One of those is getting rid of mold on the pool deck. Unfortunately, sometimes mold will show up on the pool deck so to get rid of it, you can use a scrub brush, bleach, water, pressure washer, and vacuumThe solution will do most of the work for you.

Another is heat-killing mold. If you have mold on fabric, you can wash it and put it at extreme temperatures to kill most mold spores. Using a professional company to clean is best.

Lastly, while looking at a mold inspection, it is a good idea to also sign up for a termite inspection. You don’t want to have a surprise in your home that you have termites. They can take over and ruin the structure of your home.

When Do I Call a Professional?

While sunlight can be effective in killing mold on certain surfaces, there are situations where calling a professional mold remediation service like American Property Inspections is essential. If the mold infestation is extensive, covers a large area, or affects critical structural components of your home, seeking professional help is crucial. Additionally, if you have respiratory issues, allergies, or compromised immune systems, it is recommended to consult with professionals to avoid potential health risks.


Sunlight is indeed capable of killing mold due to its UV rays, which damage the DNA of mold spores and inhibit their reproduction. While direct sunlight is more effective, indirect sunlight can also contribute to mold elimination. However, it’s essential to consider the limitations of using sunlight alone, especially in hard-to-reach areas or when dealing with extensive mold infestations.

If you need a mold inspection, reach out to American Home Property Inspections for a full mold inspection in the Clermont, FL area.


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