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Why Is My Wood Floor Turning Black?

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Does your beautiful wooden floor naturally appear in traces? Although not much, only a few traces make you feel uncomfortable with your wooden floor. Why is my wood floor turning black? There are quite a few reasons to answer this question. If you want to know the cause of fixing them, please refer to our practical sharing below!

Why Is My Wood Floor Turning Black?

Why Is My Wood Floor Turning Black

Humidity, mold and UV rays in the sun are the main causes of your wooden floor turning black. Learn more about the reason below to help you have the most appropriate solution.

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Wet Wooden Floor

The phenomenon of wood turning black from water is evident in some types of wood when moisture comes into contact with their surface. This occurs due to the reaction between the minerals in the water and the wood’s inherent tannins. As a result, a light floor can transform, adopting a darker or even black shade.

Additionally, it’s crucial to monitor pets on wooden floors since their urine can produce similar detrimental effects.

Mold Growth

Mold is one of the main causes of your wood floor turning black. When the wood floor is damp, it will quickly form a black mold that grows on the floor surface. When the floor is not dried in time, mold thrives with a denser number of molds. It creates nasty black patches on your light wood floors. These black streaks can spread with the growth of mold, and you need to take measures to prevent them in time.

UV rays

UV rays in the sun are considered one of the possible causes of your wood floor becoming darker. In particular, oak floors easily darken if exposed to direct sunlight for a long time. You need preparation and solutions when wooden furniture in the house is directly exposed to UV rays.

How to Remove Black Stains from Hardwood Floors

Fortunately, your wood floor turning black will only happen on the board’s surface, not from below or deep within. Therefore, black streaks on wooden floors will be easier to deal with. Here are some remedies to remove black stains from the hardwood floor for your reference.

Way To Get Rid Of Wet Black Stains

How to remove black stains from your hardwood floor?

Removing wet black stains from your wooden floor is not difficult. If the discoloration occurs only on the wood surface, we can use 100 grit sandpaper to remove them.

Here are some detergents you can try to remove black stains hardwood floor:

Baking Soda

  • Make a paste by mixing baking soda with a little water.
  • Apply the paste to the stain and let it sit for about 15-20 minutes.
  • Scrub gently with a soft cloth or brush.
  • Wipe away the residue and rinse the area with clean water.
  • Dry the floor thoroughly.

Hydrogen Peroxide

  • Test on an inconspicuous area first to ensure it doesn’t bleach or discolor the floor.
  • Dampen a cloth with hydrogen peroxide.
  • Place the cloth on the stain and let it sit for 10-15 minutes.
  • Gently scrub and then rinse with clean water.
  • Dry the floor completely.


  • Mix equal parts of white vinegar and water in a bowl or spray bottle.
  • Apply the solution directly to the stain.
  • Allow it to sit for a few minutes.
  • Scrub gently using a soft brush or cloth.
  • Rinse the area with clean water and dry it thoroughly.

Or you can follow the instructions below:

  • Clean black floor surfaces and dry them with a dehumidifier
  • Use 100 grit sandpaper and sand the surface of the wooden floor that is black
  • Sand in the grain’s direction for better results
  • You can use steel wool to help the sanding area match the original surface
  • Use layers of lacquer, varnish or wax to restore the original floor surface
  • You can get rid of wet black stains with just a few simple steps.

Way To Get Rid Of Mold

Way To Get Rid Of Mold

Removing mold from floorboards is not difficult, but you need more protective gear to protect your health. Mold can damage floor surfaces and can also be harmful to your health. Follow the instructions below to clean black stains on wooden floors safely:

  • Wear protective safety gear: You should wear safety glasses and rubber gloves and especially do not ignore the mask covering the nose and mouth.
  • Vacuum the black mold floor: suck up the loose mold spores on the black wood area with a vacuum cleaner to prevent them from escaping.
  • Destroy mold: If the mold has not grown deep into the wood floor, you should use soap or a safe cleaning solution to remove the mold completely. You can also use distilled white vinegar to kill the fungus.
  • Sand the wood as the mold grows deeper: If the mold has grown deep into the wood floor, you will need to sand the wood to remove the entire wood floor with the fungus. For the perfect original finish, you need to use fillers, varnishes, or lacquers.

Way To Prevent UV Rays

Way To Prevent UV Rays

Wooden items or wooden floors in the house are very easily affected by UV rays. You can’t avoid UV rays, but there are solutions you can find:

  • Curtains: One simple solution you can make is to use curtains. Curtains block UV rays very well but sometimes make the room darker.
  • Window Film: Use films that can limit UV rays entering the house. Flims can decorate your home with a variety of product images.
  • Wood Coating: Wood coatings have been around for a long time. With increasingly advanced coatings, it’s easier to protect items.
  • Furniture Placement: Depending on the arrangement of the furniture, it can prevent UV rays from reaching the wooden objects directly.

=> Also, we have some wood floor care tips might helpful for you!

Is Black Mold Cleaning Bad For Me?

Black mold releases toxins that adversely affect the body. Depending on the concentration, it can affect even healthy people. If there are children or infants at home, remove those mold immediately for your family.

=> You might need: Polish Your Floor for Holidays

Do I Need A Floor Cleaning Contractor?

To protect yourself and your wooden floor in the best way, you should find a reputable cleaning contractor. They are the people who can assist you in removing mold or cleaning wooden floors. Any problems will be properly resolved.

Iconic Cleaning is one of the reputable office and commercial cleaning company in Galway, offering a wide range of cleaning service packages. With years of experience, we can make it easy for you to remove any black stains from your wood floors in the best possible way.

Hopefully, through our sharing in this article, you have found the answer to the question, “why is my wood floor turning black”.