How do you check for moisture under vinyl flooring?

Author: Prof. Jakayla Parker  |  Last update: Saturday, April 25, 2026

How Do You Check for Moisture Under Vinyl Flooring? Use moisture meters or conduct a relative humidity (RH) test to check for moisture under vinyl flooring. RH tests involves drilling a hole into the concrete and placing a probe to measure the moisture levels.

How can I tell if there is water under my vinyl floor?

Bubbling: A buildup of water beneath vinyl can cause it to bubble, which is visibly noticeable and can be felt when walking on the flooring. The bubbles can remain even after the water dries up. Gapping: Water can loosen the adhesive that holds vinyl flooring down, which can cause a gap between two planks.

How do you stop moisture under vinyl flooring?

Use moisture barriers or underlayment specifically designed for LVP flooring to prevent moisture from seeping up from the subfloor. Proper sealing around the edges and at the joints can also prevent water from penetrating beneath the planks.

How to tell if there is mold under vinyl plank flooring?

Signs of Mold Under Vinyl Plank Flooring

Musty Odor: One of the first indicators of mold under your flooring is an unmistakable musty smell. This odor is a strong sign that mold is present, even if you can't see it. The scent is often described as damp, earthy, or like rotting leaves.

How to detect moisture under flooring?

Moisture testing before installation of a floor covering

These tests can be carried out with Tramex concrete moisture meters, RH probes, moisture content probes and surface thermometers. These are available in specifically designed concrete moisture test kits.

🚨 Attention all luxury vinyl plank (LVP) owners! 🚨When water is trapped beneath your LVP flooring.

Can you 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.

Can a moisture meter read through vinyl flooring?

How Do You Check for Moisture Under Vinyl Flooring? Use moisture meters or conduct a relative humidity (RH) test to check for moisture under vinyl flooring.

How do you get rid of mold under vinyl flooring?

Borax is highly recommended as a mold remediation product. To get rid of mold using borax, you'll need to mix it with one gallon of hot water. Then, apply the solution to the area affected by mold beneath the flooring. Next, scrub the area with a brush until the mold cannot be seen anymore.

What are symptoms of black mold exposure?

The most common symptoms of black mold exposure include:
  • Sneezing.
  • Coughing.
  • Nasal congestion.
  • Postnasal drip.
  • Red eyes.

Will a dehumidifier dry under vinyl plank flooring?

To dry out vinyl surfaces, you can use fans, a heater, towels, or a mop. If the water gets under the flooring coming from an area below the floors (like a pipe leak), then you need to fix that first. Then you should follow up with a shop vac and/or dehumidifier to eliminate excess moisture.

What happens if you don't put a moisture barrier under vinyl flooring?

When moisture penetrates your flooring, it can cause mold, mildew, and the potential for water damage. A moisture barrier helps control the water vapor's movement to help protect your floors. Therefore, if you're installing floors in an area that sees moisture, even a little, a vapor barrier is needed.

How do I get rid of moisture under my floor?

The most common and effective way to do this is by using a dehumidifier in tandem with fans to help draw out the air humidity and excess water quickly. Other common ways to dry out your concrete floor include, but are not limited to: Using a wet vacuum to suck up excess moisture.

Can mold grow under vinyl plank flooring on concrete?

Yes, mold can grow under vinyl flooring if moisture becomes trapped underneath the flooring material. Vinyl flooring is not a breathable material, which means that moisture cannot escape through the flooring.

How to get rid of moisture under vinyl flooring?

Dry Out the Subfloor:

If water has seeped under the flooring, it's crucial to dry out the subfloor completely before reinstalling the vinyl. Use fans, dehumidifiers, or professional drying equipment to ensure all moisture is removed.

How to tell if water is under the floor?

If you see water coming up through the seams, or hear a squishing sound, you can know for sure that water is underneath your floor and it needs to be removed.

What destroys vinyl plank flooring?

Enemies of Vinyl Flooring
  • Dirt and Grit: Acting like sandpaper, dirt and grit particles can scratch the wear layer of the vinyl, especially at entryways and high-traffic areas. ...
  • Sharp Objects: Dropping sharp objects like knives or tools can puncture or gouge vinyl.

How do I test myself for black mold exposure?

Urine Mycotoxin Test Kit

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.

What spray kills black mold?

Treat the Area. For a natural solution to getting rid of black mold, combine one part baking soda with five parts distilled white vinegar and five parts water in a spray bottle. Alternatively, you can use a chemical-based mold and mildew remover, all-purpose cleaners, bleach or dish soap.

What are the 10 warning signs of mold toxicity?

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 happens if water gets under vinyl flooring?

On the other hand, water under vinyl planks and subfloor that collects and has a place to infiltrate could turn into a bigger problem. Mold and mildew can form where moisture has a gap to enter. This can lead to damage that's bad enough to where you will need to rip up the floor and have it replaced.

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.

How to test for mold under flooring?

Musty odor: Mold has a distinct musty smell. 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.

How do you check for moisture under flooring?

This standard calls for the use of a thermo-hygrometer with in-situ probes to measure the relative humidity conditions deep in the slab—an approach that is far more reliable than taking surface-level moisture measurements with a flooring moisture meter.

How can you tell if mold is under vinyl flooring?

Common signs to predict mold growing under your vinyl flooring
  1. Locations with exposure to moisture:One of the most common signs of mold growth is to analyze the places with exposure to moisture. ...
  2. The unbearable musty smell:Usually, there is an earthy, mushy odor when mold grows in the surrounding.

What is the moisture test for LVT?

Moisture levels

Firstly, you can use a hygrometer to measure the relative humidity (RH). LVT products can only be installed on subfloors with moisture levels below 75% RH. If the reading is above 75% RH, you must install a surface damp proof membrane (DPM).

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