To dry water under vinyl plank flooring, you must act quickly to prevent mold and subfloor damage. Because vinyl is non-porous, water underneath won't evaporate on its own. You will need to remove baseboards, lift the affected planks, and use fans, dehumidifiers, and a wet/dry vacuum to dry the subfloor completely.
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.
Short answer: yes, mould can grow under vinyl flooring — but only when moisture gets trapped between the planks and the subfloor. Vinyl itself is non-porous, so the planks don't host mould.
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.
Employ drying techniques like dehumidifiers and fans to remove moisture trapped under flooring. Waterproof vinyl and laminate floors have specific vulnerabilities that need addressing to prevent long-term damage. Regular inspections and proper installation are key to effective water damage prevention.
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.
Luxury Vinyl (LVP & LVT)
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. However, if the water has been sitting for more than a day or has reached the subfloor, repairs become more complicated.
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.
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.
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.
If your house smells musty, or you notice discoloration on your flooring, you may have mold under your vinyl flooring. Mold seldom remains hidden for long, so if you see mold creeping up from under your vinyl flooring–you're probably looking at a much bigger problem.
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.
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.
Water vapor can cause serious damage to your home. For instance, if your flooring gets wet, it could cause mold and mildew, and even destroy your floor (source). No one wants that, so vapor barriers are there to help prevent the floor from getting wet.
The best months to buy flooring are late December through February and mid-May to early June. During winter, flooring stores clear out old inventory with deep discounts—often 15–30% off.
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.
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.
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)
Yes. Both dry and wet Swiffer mops are safe to use on vinyl plank, as long as you're using cleaning pads that don't leave behind residue. Just avoid soaking the floor.
So, you are trying to figure out if water damage is causing your subfloor to rot and what signs you should watch for. You check for soft, spongy, uneven, or squeaky floors, musty smells, staining, warped boards, and visible mold; then confirm with a moisture meter or by opening up a small test area.
MGO (magnesium oxide) subfloor panels are leading the market with impressive moisture resistance. These panels stay structurally sound in humid environments and won't swell, warp, or rot when moisture hits them. MGO boards reach a material strength of 13.36Mpa and easily handle standard 24-inch joist spacing.
You might need to replace your subfloors—the base layer that supports your flooring—if you're dealing with squeaky floors, warping, or water damage. For an average-sized room of 300 square feet, expect to spend about $900 to $3,000 on the cost to replace subfloors, or $3 to $10 per square foot.
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.
Mold can begin growing and colonizing within 24 to 48 hours of a water event. While spores germinate almost immediately, it typically takes 3 to 12 days for colonies to become visible, and 18 to 21 days to fully mature.
It's essential to have the electrical systems checked and fixed after water damage. For these reasons, it's not safe to sleep in a room with water damage at first. Only after experts confirm it's safe, and all the issues are fixed, should you sleep there.