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Water Under LVP Flooring: What to Do, and When the Subfloor Is Damaged
Water under luxury vinyl plank (LVP) flooring usually won't dry out on its own. "Waterproof" planks keep spills out from the top, but water from a toilet, appliance, or pipe leak runs through seams and edges and sits on the subfloor. Stop the leak, wipe up what you can, and have the planks lifted so the subfloor can be checked and dried before the floor goes back down.
Good Life Home Co. fixes the leak, the subfloor, and the floor with one in-house team in Fort Collins, Windsor, and Loveland. Call or text 970-610-6200.
Written with Luke Buelow, licensed Colorado master plumber, Good Life Home Co.
Luxury vinyl plank (LVP) in a Fort Collins, Windsor, or Loveland bathroom, kitchen, or laundry can look dry on top while water sits under the vinyl plank. A toilet or appliance leak is a common way that happens. The repair for a toilet is toilet leak floor damage repair: stop the leak, check the subfloor, and replace the floor after the area dries. Replacement is usually the better route.
Is LVP waterproof? Yes on top, not underneath
The plank itself shrugs off a spill you wipe up. The installed floor has seams, a gap at every wall, an underlayment, and a wood subfloor or a concrete slab under it.
Water from a leak gets in at the seams and edges and spreads under the planks. The planks then hold that water against the subfloor like a lid. Most LVP is a floating floor: planks click together, and a gap at the walls lets water travel away from where it started.
Many manufacturers limit a "waterproof" warranty to water on top of the planks. The warranty often does not cover the subfloor, and it often does not cover damage from a plumbing leak or a leaky appliance. Check the warranty for the product in your house.
Where the water under LVP usually comes from
The leak has to be found and stopped first. Usual sources are a toilet seal, a supply line, a dishwasher, a fridge water line, a washer, or a water heater. Leak and water damage repair starts there. A freeze can split a supply line too. See frozen pipes in Northern Colorado.
A toilet leak
A failed wax seal, or a cracked or too-low flange, leaks a little with each flush, under the floor where you can't see it. After new LVP goes in over an old floor, the flange can sit too low. Toilet leaking under LVP is toilet leak floor damage repair.
The tell: soft or lifting planks around the toilet, sometimes on one side, plus a toilet that moves or a smell at the base. Running and fill-valve problems are toilet repair. If the toilet moves, see why a toilet rocks and whether the floor is rotten.
A supply line or shutoff valve
The line to the toilet, sink, or fridge can drip at a connection. It does not wait for someone to use the fixture.
The tell: the damaged area grows even when nobody uses the fixture. See supply line leaks.
The dishwasher or the fridge water line
A slow drip at the hookup runs under the cabinets and the planks. We find the leak at the supply line or the connection.
The tell: seams lifting or swelling in front of the dishwasher or the fridge.
The washer or water heater
In a laundry or utility room, the leak is at the hookup, the valve, or the water heater. We find that leak.
The tell: lifting at the edge of the room nearest the appliance. See water heater leaks and water heater repair.
Under the sink
A drain or supply drip in a vanity or a kitchen sink cabinet reaches the floor at the toe kick.
The tell: a swollen cabinet bottom or toe kick, with lifting planks just outside the cabinet. See under-sink leaks.
Water coming up under LVP on a basement slab is usually ground moisture, not a plumbing leak. That is a different problem, covered in the questions below. This page does not diagnose a slab.
Signs water is under your vinyl plank floor
Buckling or peaking
Planks rise in a wave or a ridge at a seam. Near a toilet, sink, dishwasher, fridge, or water heater, think water first. In a sunny room, or where trim pins the floor at a wall, heat or a blocked expansion gap can buckle planks with no leak. If the ridge is near water, or the floor feels soft, find the leak first.
Seams separating or edges lifting
Gaps open between planks, or an edge curls, near a wet area. The seam is often where the damage shows first.
Soft spots
The floor gives underfoot. LVP does not go soft by itself. Softness under LVP usually means the underlayment or the subfloor has taken on water. A dip in the subfloor or a soft underlayment can do it too, but near a toilet or an appliance, treat it as a leak. See what a soft floor near the toilet means for how deep that damage can go. This page does not repeat that layer list.
Other clues
A damp smell that won't clear, staining at the baseboard, swollen baseboards, or a swollen cabinet toe kick all belong with the floor clues. So does a stain on the ceiling below. Have it checked. If that ceiling needs work after the leak is fixed and the area is dry, that finish is drywall repair.
Will water under vinyl plank flooring dry out on its own?
Usually not reliably. The planks act like a lid, so the water sits on the underlayment and the subfloor. Fans on the surface dry the surface. Manufacturers say that if water has reached between the vinyl and the subfloor, the flooring has to come up so the subfloor can be dried and cleaned before any flooring goes back down. We then replace the floor. Floors are replaced after the area dries.
A spill you wiped up right away is different. That is what the waterproof surface is for.
Don't caulk or seal the seams to keep water out, lay new planks over a wet area, or wait to see if a soft spot goes away.
What to do today
None of this needs tools. It limits the damage and gives us what we need before we come out.
- Stop the water. Turn off the supply valve behind the toilet, under the sink, or behind the appliance, clockwise, if it's easy to reach. If you can't find the source or it won't stop, shut off the main water.
- Stop using the fixture. Don't flush a toilet you suspect, and don't run the dishwasher or the washer.
- Wipe up the surface water and pull rugs and anything stored on the floor out of the wet area.
- Mark the edges. Put painter's tape at the edge of the buckling, lifting, or soft area so we can see if it grows.
- Take photos of the floor, the fixture or appliance, the baseboard, and any stain on the ceiling below.
- Find leftover planks. If you have spare boxes from the install, note the product name. It helps the matching conversation.
- Check below if it's easy. Look at the ceiling under an upstairs bathroom or laundry, or look from the access point in a crawlspace or unfinished basement with a flashlight.
Stop and call now if:
- Water is still coming and you can't shut it off at the fixture.
- The floor is soft or gives.
- The toilet moves.
- The ceiling below is stained, sagging, or dripping. Stay out from under it and leave that light off.
- The damage spreads past one room.
Don't caulk or tape the seams to seal the water in, lay new planks over a wet area, pull a toilet up yourself if the floor is soft, run a heat gun or space heater on the planks, or wait for a soft spot to firm up.
Call or text 970-610-6200 with photos of the floor and the fixture next to it. Same-day service is often available when the schedule allows.
What the repair involves: leak, subfloor, then floor
- Find and fix the leak. A licensed Colorado master plumber finds the source and repairs it: the seal and flange, a supply line or valve, or a drain connection. The price is agreed before the repair begins.
- Take up the wet planks. The flooring in the wet area comes up so we can see how far the water went and reach the subfloor.
- Dry it. If the wet area is small, cleanup and drying stay with the repair. If the water spread across rooms or a large area, we say so and refer that part to a restoration partner. The leak repair can still be ours. See restoration company or just the repair.
- Repair the subfloor. Remove water-damaged underlayment and subfloor and install new. If a toilet leak reached the flange or the floor joists, those get repaired too. That scope is toilet leak floor damage repair.
- Replace the floor after it's dry. Floors are replaced after the area dries, and replacement is usually the better route. Then the trim, transitions, and toilet go back in. How much floor gets replaced, the damaged area or the whole room, is agreed before work starts.
If something different turns up once the floor is up, we stop and talk first. That is the No Change Order Guarantee. The price we agree to on site is the price you pay for that scope. If the job changes, we talk first — we do not surprise you later.
Can you reuse vinyl plank flooring after water damage? Replacement is usually the better route
Usually, replacement is the better route than lifting the old planks and laying them back down. That is our experience, not a manufacturer rule.
Planks that sat on a wet subfloor can be swollen, cupped, or damaged at the locking edges. Old planks don't always lock back tight or sit flat. Replacing them means the new floor goes down on a dry, repaired subfloor and is done once.
How much gets replaced, the damaged area or the whole room, depends on the floor, the layout, and whether new planks can match the old ones. We talk through it and agree on it before work starts. If you kept leftover boxes from the original install, tell us the product name. If the product is discontinued, new planks may not match the rest of the floor, and that is a conversation before work starts. We don't promise a match.
Why one team matters when water gets under LVP
Water under LVP usually needs a plumber for the leak, a carpenter for the subfloor, and a flooring installer for the planks, and sometimes drywall and paint below. Good Life Home Co. has a licensed Colorado master plumber and an in-house repair crew that handles the flange, subfloor, floor joists, flooring, trim, paint, and drywall, under one price agreed up front and backed by the 3 Year Workmanship Guarantee. If our workmanship fails within three years, we come back and make it right. Materials follow manufacturer coverage.
Repair the subfloor under the toilet is that same visit when the toilet is the source.
On a different floor, a Loveland toilet was leaking. Luke walked through the leak and the repair options before the floor came up. The team then removed multiple layers of old tile, found water damage underneath, rebuilt the floor, and restored the toilet. That was tile, not LVP. Read the Loveland case study.
The site shows 5.0 from 63 Google reviews. Bob, in a Google review published on the site, said: "Luke was great to work with and came up with some very good solutions for a couple of our challenging repairs." The owner is a licensed Colorado master plumber. The company was founded in 2021. We do this work as a plumber in Fort Collins, a plumber in Windsor, and a plumber in Loveland.
Frequently asked questions
What should I do if water gets under my LVP flooring?
Stop the leak first, at the fixture's valve or the main. Then wipe up the surface water, stop using that fixture, and take photos. Water that's under the planks usually needs the planks lifted so the subfloor can be checked and dried.
Will water under vinyl plank flooring dry out on its own?
Usually not reliably. The planks hold the water against the underlayment and subfloor, so it can't escape. Manufacturers say the flooring has to come up so the subfloor can be dried and cleaned, and then the floor is replaced once the area is dry.
Isn't LVP waterproof?
The planks are, from the top. The installed floor has seams, an edge gap at the walls, and a subfloor under it, and leak water gets through those and sits on the subfloor. Many waterproof warranties cover only topical water and exclude damage from plumbing or appliance leaks.
Why does my LVP floor have soft spots?
A soft spot near a toilet, sink, or appliance usually means water has reached the underlayment or subfloor under the planks. It can also come from a dip in the subfloor or a soft underlayment, but if it's near water, treat it as a leak. Lift a plank or have it checked before the damage spreads.
Why is my LVP flooring buckling?
Water under the planks is a common cause, especially near a toilet, dishwasher, fridge, or water heater. Heat, strong sun, or trim pinning the floor at the walls can also make planks buckle. If it's near water or the floor feels soft, find the leak first.
Why is there water under my LVP on a concrete basement floor?
It can be a plumbing leak, but water coming up through a slab is often ground moisture, which is a different problem. Check nearby fixtures, the water heater, and the laundry first. If there's no plumbing source, it's a moisture issue for the slab, not a leak repair.
Can I reuse my vinyl planks after water damage?
Usually, replacement is the better route. Planks that sat over a wet subfloor can swell, cup, or get damaged at the locking edges, and old planks don't always go back down tight and flat. We replace the flooring after the leak is fixed and the area is dry, and we agree on how much gets replaced before work starts.
Who fixes the leak and the floor under LVP?
Usually two or three different trades, but Good Life Home Co. does it with one in-house team. A licensed Colorado master plumber fixes the leak, and the same crew repairs the subfloor and replaces the flooring once the area is dry. The price is agreed before work starts.