What does mold under laminate look like?

Author: Nakia Stiedemann  |  Last update: Sunday, July 27, 2025

Visual inspection is a key strategy in detecting mold growth. Discoloration or dark spots on your laminate flooring can be a clear sign of mold. These spots may appear green, black, or brown, hinting at the presence of mold beneath the floor.

How to tell if mold is under laminate flooring?

If you notice a persistent musty odor in a room, it could be a sign of mold growth beneath the flooring. Discoloration or stains: Look for any discoloration, warping, or stains on the surface of the laminate flooring. Water damage caused by mold growth can lead to changes in the appearance of the flooring material.

How long does it take for mold to grow under laminate flooring?

It only takes as little as 24 hours for mold to start growing under wet laminate flooring, if the water is dirty, it has come from a dishwasher, outside groundwater, a toilet or dirty carpet it can start growing bacteria even quicker, in as little as 12 hours.

How to get rid of mold under laminate?

The Best Way to Remove Mold Under Laminate Flooring?
  1. Use a HEPA filter vacuum. ...
  2. Apply mold-killing spray. ...
  3. Vacuum the area. ...
  4. Apply an anti-mold coating. ...
  5. Encapsulate the mold. ...
  6. Prevent mold underneath laminate flooring by using a moisture alarm. ...
  7. Install a vapor barrier.

What happens if moisture gets under laminate flooring?

If water gets under laminate flooring, it can cause the planks to swell, warp, or lift. In severe cases, the flooring may need to be replaced to prevent further damage.

Mold contaminated floor joists

How do you check for moisture under laminate flooring?

Tools Needed for Testing Moisture in Laminate Flooring

Moisture Meter: The most accurate way to measure moisture in flooring is with a moisture meter. Look for a pinless (non-invasive) meter, which can measure moisture without puncturing the floor's surface.

What happens if you don t put moisture barrier under laminate flooring?

Instead of taking measures to install a vapor barrier, some DIYers elect to install their laminate floors without protection. This measure can prove costly, as moisture damage can quickly warp and possibly ruin a wide variety of materials.

Is there a way to test for mold under flooring?

The only way to know for sure is to carefully pull up the floorboards or tiles where you suspect mold to be growing underneath. You can also use a mold test kit or have your home inspected by a professional, depending on your budget and the severity of mold.

What are the symptoms of mold exposure?

Although symptoms can vary, the most common symptoms seen in people exposed to mold indoors include:
  • Nasal and sinus congestion.
  • Eye irritation, such as itchy, red, watery eyes.
  • Wheezing and difficulty breathing.
  • Cough.
  • Throat irritation.
  • Skin irritation, such as a rash.
  • Headache.

What does mold under flooring look like?

Visible Signs

One of the most apparent indicators of mold is visible damage to your flooring. Look for: Discoloration: Patches of yellow, green, or black can signal mold growth. Warping: Uneven or bulging floorboards suggest moisture buildup, a breeding ground for mold.

What kills mold under flooring?

Borax is highly recommended as a mold remediation product.

What does mold look like on laminate?

Discoloration or dark spots on your laminate flooring can be a clear sign of mold. These spots may appear green, black, or brown, hinting at the presence of mold beneath the floor. Don't ignore these spots or stains, as they may signify an urgent mold issue that needs addressing.

What is the life expectancy of laminate flooring?

The average lifespan of laminate flooring ranges from 15 to 25 years. Several factors influence its longevity: Quality: High-quality laminate with a thicker wear layer will outlast budget-friendly options. Installation: Proper installation on a level subfloor ensures greater stability and wear resistance.

Should I put something under my laminate flooring?

We would recommend an underlay of 3 – 5mm for laminate flooring. It should be at least 3mm thick to provide comfort and ground levelling properties. But, it should be no more than 5mm thick. If it's any thicker, you could experience problems with the laminate's locking system.

Will a dehumidifier help with mold?

Mould will easily grow and spread if the right conditions are present. So, dehumidifiers don't kill mould, but they can help to prevent it from growing inside your home by reducing humidity. However, the best way to deal with it is to get rid of its source.

Can mold grow under vinyl plank flooring?

Mold Growth: Mold can thrive under vinyl plank flooring due to moisture. Health Risks: Exposure to mold can lead to respiratory issues, allergies, and more serious health conditions. Vinyl Plank Flooring: While durable and versatile, can be a breeding ground for mold if not properly maintained.

Can I test myself for mold exposure?

Urine mycotoxin tests are ideal for testing yourself (and your family members) for mycotoxin exposure. They're absolutely painless, totally non-invasive, and incredibly easy to use.

How long can you be exposed to mold before getting sick?

According to the CDC, people usually experience their first symptoms within 2 to 9 hours of their first exposure. On the other hand, some people could go for weeks or months before feeling sick if their exposure is limited enough. This is why it is also important to check damp, dark areas of your home for mold.

How to know if there's mold under laminate?

Look around the room and see if you can find any signs of mold growth, including a musky odor, as well as black or dark green streaks in-between the planks. If it ever gets to this point, you'll need a full replacement, as the mold can infiltrate your home and wreak havoc on your health.

Does homeowners insurance cover mold?

Homeowners insurance doesn't usually cover mold damage or removal unless it's the result of a covered peril. If the mold in your residence was caused by something sudden or accidental, such as a bursting pipe or some other covered incident on your policy, you may be protected.

What is the black stuff under the vinyl floor?

If you see black stuff under your vinyl flooring, it's probably mold. There is a chance it could just be dirt, dried-out adhesive, or slight water damage, but some of those are causes for mold growth, so you should remove it immediately anyway. In some older homes, it could be black mastic asbestos.

Is it normal to have moisture under laminate flooring?

Even small amounts of moisture, when left unattended, can seep through the seams and cause damage. Humidity: High humidity levels in your home can lead to moisture buildup beneath your laminate flooring. This is particularly common in regions with a humid climate.

What happens if you don t leave a gap for laminate flooring?

Without an expansion gap, the flooring would be constrained by the surrounding walls, causing it to buckle and potentially even damage the subfloor.

What is the rosin paper under vinyl plank flooring?

Flooring Industry

Building Construction typically use red rosin paper to help reduce air and moisture flow through a wall or floor. This creates a “slip sheet” so different materials can slip by each other as they expand and contract. Keeping dust from dust from working down the floor and minimizing squeaking.

Previous article
What scents attract crickets?
Next article
How wide of an opening for a washer and dryer?