Is Laminate Flooring Waterproof? What St. Louis Homeowners Should Know

Short answer: most laminate flooring is water-resistant, not waterproof. The surface and the locking joints can handle spills and quick cleanups, but the fiberboard core underneath swells if water sits on it or gets in. A few newer lines carry "waterproof" labels and warranties, but even those have limits, so for bathrooms, basements and laundry rooms we usually recommend luxury vinyl plank instead.

Is laminate flooring waterproof?

Not in the way vinyl is. Laminate is built in layers: a clear wear layer, a printed design layer, and a core of high-density fiberboard (HDF), which is made of compressed wood fibers. That core is the weak point. When it absorbs moisture it swells, and once it has swollen it does not go back to its original shape.¹

Manufacturers have made real improvements. Pressed bevels, sealed edges and tighter click joints all slow water down, and some brands now sell "waterproof" laminate with a written warranty. But "slows water down" is not the same as "waterproof." One flooring industry writer notes that beveled and wrapped edges only delay water getting in, and that water can eventually find its way through the joints.¹

Waterproof vs. water-resistant: what the labels mean

• Water-resistant means the floor can handle surface moisture for a limited time. Wipe up a spill promptly and it should be fine.
• Waterproof should mean water cannot damage the floor even if it sits there. For laminate, that claim is usually based on a lab test, not on a flooded room.

The North American Laminate Flooring Association (NALFA) has a standard "Surface Swell, Assembled Joint" test method, and NALFA certification requires independent third-party testing.¹ Even so, there is no single universal "waterproof" standard, and individual manufacturers can test with different amounts of water and for different lengths of time. A common test pours water over assembled joints and measures how much gets through in 24 hours, which does not tell you what happens during a slow leak that goes unnoticed for days.¹ Always read the warranty itself: what it covers, how long, and what installation conditions it requires.

One more thing that trips people up: the "AC rating" on a laminate box measures abrasion (scratch and wear resistance), not water resistance. A high AC number does not make a floor more waterproof.

What happens when laminate gets wet

A quick spill on the surface is usually harmless. Trouble starts when water stays on the floor or reaches the core:

• Edge swelling. Plank edges puff up and the seams become visible.
• Peaking and lifting. Boards push up at the joints or lift off the subfloor.
• Warping and bubbling. The surface can bubble or cup.
• Delayed damage. In one test described by an industry writer, a plank submerged for a week looked fine at first, but as it dried, which took up to three months, the layers swelled.¹
• Mold risk. Moisture trapped between the floor and the subfloor can lead to mold and odor.

Damaged laminate planks generally cannot be dried out and saved. They have to be replaced.

Where laminate works, and where it does not

Room	Standard laminate	"Waterproof" laminate	Luxury vinyl plank
Living room, bedrooms, hallways	Great fit	Great fit	Great fit
Kitchen	Fine with prompt cleanup	Good with prompt cleanup	Best choice
Laundry room, mudroom	Not recommended	Use with caution	Best choice
Bathroom	Not recommended	Use with caution	Best choice
Basement	Not recommended	Use with caution	Best choice

Our recommendations for St. Louis homes come from what we see on the job. Basements here can pick up moisture through the slab, and bathrooms and laundry rooms see regular splashes and the occasional overflow. In those rooms, a floor that is truly waterproof all the way through is worth the small difference in cost.

Waterproof alternatives to laminate

Luxury vinyl plank (LVP) is made of vinyl rather than wood fiber, so the planks themselves do not swell when wet. That is why it is our go-to for wet and below-grade spaces. You still want to clean up standing water promptly and seal around the room perimeter where the manufacturer calls for it, but the floor itself is not what gives way. You can see the options on our luxury vinyl plank and waterproof flooring pages.

Tile is also unaffected by water and is a classic choice for bathrooms and entryways. See our tile flooring page.

If you are weighing laminate against vinyl for the whole house, our guide Luxury Vinyl Plank vs. Laminate Flooring compares them side by side. For specific rooms, we also have pages on kitchen, bathroom and basement flooring.

How to protect laminate floors from water

1. Wipe up spills quickly. Do not leave water sitting on the floor or in the seams.
2. Mop lightly. Use a barely damp microfiber mop and a manufacturer-approved cleaner. Skip steam mops and wet mopping.
3. Use mats at doors and sinks. They catch tracked-in snow and slush and drips from the dishwasher and sink.
4. Check the usual leak spots. Look around the dishwasher, refrigerator ice-maker line, washing machine hoses and water heater now and then.
5. Seal the perimeter and transitions. Follow the manufacturer's installation instructions, since some warranties depend on it.
6. Act fast on a leak. Stop the water, remove it and lift or dry affected areas as soon as you can. The sooner, the better the chance of avoiding replacement.

Frequently asked questions

Is laminate flooring waterproof?

Standard laminate is not waterproof. It is water-resistant for spills and surface moisture. Some products are marketed as waterproof laminate, but their protection has limits, so read the warranty details before you buy.

Can I put laminate flooring in a bathroom?

We generally do not recommend it. Steam, splashes and standing water around tubs and toilets are a lot for a fiberboard core. Luxury vinyl plank or tile is a safer choice.

Can laminate flooring go in a basement?

We usually advise against it, especially on a concrete slab that can transmit moisture. Basements are a better fit for waterproof luxury vinyl plank.

Is laminate waterproof for kitchens?

Laminate works in many kitchens as long as spills are wiped up quickly. If you have a dishwasher or ice maker that could leak, or you simply want peace of mind, LVP is the safer option.

What is the difference between waterproof laminate and vinyl plank?

Waterproof laminate still has a fiberboard core with improved edges and joints. Vinyl plank has no wood-fiber core, so the plank itself does not swell when wet.

Does the AC rating tell me if laminate is waterproof?

No. The AC rating measures abrasion resistance, not water resistance.

Not sure which floor is right for your room?

Tell us where the floor is going and we will give you an honest recommendation. Request a free estimate or call Kelly's Flooring at (636) 677-5555. We are a family-owned flooring store at 2311 Little Antire Rd in High Ridge, Missouri, serving the St. Louis area since 1978, and we can show you laminate and waterproof vinyl samples side by side.

Sources and method

1. Paul Hambidge, "The Waterproof Laminate Myth: Why Consumer Expectations May Never Be Met," originally published in Floor Trends Magazine (op-ed, April 24, 2025), republished by CTaSC. This is the opinion of a flooring industry executive and is cited for his descriptions of laminate construction, edge and joint behavior, the NALFA test, and the 24-hour test method. ctasc.com
2. Room recommendations reflect Kelly's Flooring's installation experience in the St. Louis area and are general guidance. Always follow the manufacturer's installation instructions and warranty terms for the specific product you choose.