If water gets under Luxury Vinyl Plank (LVP) flooring, it becomes trapped and cannot evaporate because the vinyl acts as a vapor barrier. This leads to mold and mildew growth, rotting wooden subfloors, foul odors, and can eventually cause the planks to buckle, cup, or compromise the click-lock joints.
Ideally you would remove some planks and run a dehumidifier until all is dry. You probably at least want to remove one row of plank to see how much water is still under, if you can, then decide if more removal is needed. If you remove properly, you can re-use them.
Water trapped under Luxury Vinyl Plank (LVP) rarely dries out on its own. Because LVP is made of vinyl, it creates a non-porous vapor barrier that prevents evaporation. If water is left sitting, it creates a dark, stagnant pocket that will ruin the subfloor and trigger mold growth.
Early Signs of Moisture Beneath Vinyl Planks
Yes, mold can grow under luxury vinyl plank flooring when moisture remains trapped. The space beneath the flooring provides a dark, enclosed environment that supports mold development. Mold growth can lead to several serious concerns, including: Damage to subfloor materials.
Dust, adhesive residue, and paper-backed underlayment can all feed mold under your floor. Add trapped moisture and a warm room, and mold can start forming fast. According to FEMA, mold can begin growing on damp surfaces in as little as 24 to 48 hours. That's why what happens before your vinyl goes down is so important.
Early signs of mold exposure frequently mimic seasonal allergies. They include sneezing, a runny or stuffy nose, coughing, postnasal drip, and red, itchy, or watery eyes. Skin irritation or rashes may also occur, and mold can trigger or worsen asthma symptoms like wheezing and chest tightness.
Black spots or water stains, especially yellow or brown, are also signs of mold. Mold can grow under any flooring, including vinyl, especially where it meets the wall. Experts can find and fix mold problems. They make sure to remove toxic black mold, which is very harmful.
It takes as little as 24 hours for mold to start growing under wet laminate flooring, and if water is dirty—from dishwashers, groundwater, toilets, or dirty carpet—bacteria can start growing in as little as 12 hours.
A wet subfloor is not automatically ruined. Plywood or Oriented Strand Board (OSB) can handle exposure to water, provided it is dried out completely and retains its structural integrity. However, it must be replaced if it becomes soft, spongy, warped, or shows signs of rot.
LVP does have a water-resistant surface, but it is laid on top of the underlayment and subfloor, which can suffer from water damage. Water damage to vinyl plank flooring can cause the core material of the flooring to expand, resulting in warping, buckling, and even layer separation within the vinyl planks.
Luxury Vinyl Plank (LVP) flooring typically lasts 15 to 30 years, depending on the quality of the planks, the thickness of the wear layer, and foot traffic.
Look for: Permanent water stains and unsightly mold water damage markings on ceilings, walls and floors. Erosion of drywall, often causing it to be warped or changed in texture (TIP: newer water spots will feel firm to the touch, while older water damage will create a spongy, mushy feeling)
Luxury vinyl is typically water-resistant and sometimes even waterproof on the surface, but problems can arise if water gets underneath. If you catch the issue early, you may be able to lift the affected planks, dry the area beneath, and reinstall them without long-term damage.
"Good news! You can, in fact, replace damaged click luxury vinyl planks without needing to unclick your entire floor. However, the process does take some finesse and we recommend hiring a professional installer for the work."
Dry the Area Thoroughly: Use dehumidifiers and fans to dry the area. Focus on the subfloor too. Space heaters with fans help dry things faster. Remove Affected Flooring Sections: If the flooding is bad, you might need to take out some flooring.
Yes, a one-time water leak can absolutely cause mold. Mold spores exist naturally everywhere; if they land on a damp, porous surface (like drywall, wood, or carpet) and the moisture isn't removed quickly, mold can begin to germinate and grow within 24 to 48 hours.
Remediation and removal of mold won't be covered by your homeowners insurance unless the mold resulted from a covered peril, and coverage is often limited.
In A Nutshell: Misconceptions About Mold
Your home can be 100% mold-free: No, there are always mold spores in the air. Anyone can effectively remove mold: No, you need professional services for that.
Mold toxicity (or mycotoxin illness) occurs when you are exposed to mold spores that produce toxic byproducts. These symptoms can mimic other conditions and often range from mild respiratory irritation to severe neurological and immune responses.
Mold is generally at its worst from early spring through early fall (specifically July through October), peaking during the warmest and most humid months. Mold thrives in warm temperatures (60∘F to 80∘F) combined with relative humidity levels above 60%.
Dawn dish soap does not kill mold, but it acts as an effective surfactant to lift and scrub visible mold away from non-porous surfaces. While it washes away the active growth and prevents airborne spores from releasing, you must use a disinfectant afterward to ensure the mold roots are destroyed.
Additionally, spraying a solution of equal parts vinegar and water or a diluted hydrogen peroxide solution into the air can help to kill airborne mold spores.
The answer is yes but with important context. While air purifiers cannot eliminate existing mold growth on surfaces, they play a crucial role in capturing airborne mold spores before they settle and multiply throughout your home.
Yes, you can completely recover from mold toxicity. Recovery is highly achievable once you remove the source of exposure and take steps to support your body's natural detoxification and healing processes.