To check for moisture under installed vinyl plank flooring (LVP/LVT), use a high-quality pinless moisture meter set to a shallow scanning depth (typically 14 14 to 38 38 of an inch) to read through the vinyl without damaging it. For deeper analysis, you can pop off a wall baseboard or door transition to test the exposed subfloor directly.
Early Signs of Moisture Beneath Vinyl Planks
For homes with removable flooring materials like carpet or vinyl planks, you can conduct more direct inspection. Carefully lift a corner in a suspected problem area and examine the underside and subfloor for dampness, discoloration, or visible mold growth.
Moisture issues in LVT floors do not originate from the floor planks themselves. Instead, they mostly result from moisture accumulation directly underneath the LVT floor planks. Although LVT floors are waterproof and do not absorb water, they also inhibit the exchange of humidity between the areas above and below.
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.
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.
Water can sit on the surface of Luxury Vinyl Plank (LVP) flooring for 24 to 48 hours or more without causing damage. However, because LVP features a click-lock installation, water can seep through the seams if left too long, causing mold, subfloor damage, or edge-peaking.
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.
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 damage can look different depending on your flooring material. Watch for: Hardwood: Warping, cupping, or crowning; boards may separate or feel uneven; you might notice dark stains or a musty odor. Luxury Vinyl (LVP/LVT): Curling edges, lifting tiles or planks, soft spots from subfloor damage.
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.
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.
Spray the affected area with the vinegar and let it sit for an hour to allow the vinegar to penetrate the surface and kill the mold at the root. Rinse the surface with warm water, spray again with vinegar, and allow to dry. -Hydrogen peroxide can remove mold.
The Hidden Mold Problem Beneath LVP
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.
A dehumidifier will not effectively dry underneath luxury vinyl plank (LVP) flooring on its own. Because LVP is made of non-porous plastic, it acts as a waterproof barrier that traps moisture underneath. For the trapped water to dry, you must remove the baseboards and pull up the affected planks to allow the subfloor to breathe.
Luxury Vinyl (LVP/LVT): Curling edges, lifting tiles or planks, soft spots from subfloor damage. Carpet: Persistent dampness, discoloration, odor, or a spongy feel underfoot—signs the padding is affected.
Yes, mold can absolutely grow under vinyl plank flooring. Because vinyl is waterproof and non-porous, it does not allow air to pass through. If moisture gets trapped underneath, the flooring acts like a plastic lid, trapping water and creating an ideal, dark breeding ground for mold.
Yes, you can use Dawn dish soap on vinyl floors. It is a safe, cost-effective way to cut grease and grime. However, you must use it sparingly—adding just 1 to 2 drops per gallon of warm water—and always rinse the floor with clean water afterward to prevent a dull, sticky film from building up.
Standing water can still seep through and damage the subfloor if no waterproofing layer is installed. However, they can be prone to dents and scratching. Also, they may fade when installed in areas constantly exposed to the sun. Vinyl planks also can't withstand extreme temperature changes very well.
Yes, you can safely use standard Swiffer wet pads or a Swiffer WetJet on Luxury Vinyl Plank (LVP) floors. Because LVP is water-resistant and durable, the light moisture from Swiffer pads falls well within safe damp-mopping limits, making it a great option for quick clean-ups.
Healthiest Flooring Types Compared
Four Ways to Prevent Moisture Damage Under Luxury Vinyl Flooring
What are the most popular vinyl plank flooring colors in 2026? Light oak, greige, and soft brown tones continue to be favorites. These colors feel fresh and versatile, working well with neutral palettes, natural light, and the relaxed, airy look many homeowners are going for right now.
15 Mistakes to Avoid When Installing Glue Down Vinyl Plank Flooring