Is Karndean Flooring Really Waterproof? What 4 Years of Quality Inspections Taught Me

It started with a white tank top and a question about water

It was a Tuesday afternoon in early March 2024. I'd just finished reviewing a batch of Korlok click samples when my phone buzzed. A prospective customer—let's call her Sarah—had reached out through our distributor network. She'd been comparing Karndean with other luxury vinyl brands and had one specific worry: water.

"I've got a three-year-old and a golden retriever," she said. "Spills happen every day. Plus I'm planning to put the flooring in my kitchen and half-bath. I need to know: is Karndean flooring waterproof? Not just water-resistant. Waterproof."

She showed me photos of her space over video call. She was wearing a simple white tank top, the kind that says 'I'm not trying to impress anyone, I just need answers.' Behind her I could see a roll of stained glass window film she'd bought for a DIY project, and on the coffee table sat a crochet kit for beginners—still unopened, because she'd been too busy researching flooring.

That moment stuck with me. Here was a homeowner who was juggling multiple projects, on a budget, and just wanted something that would work without being a pain to maintain. She wasn't a big contractor ordering 10,000 square feet. She was a small client—exactly the kind of customer some vendors might brush off.

The industry's dirty secret about "waterproof"

Look, I've been in quality control for over four years now. I review roughly 200 unique product shipments annually. What most people don't realize—and what vendors won't tell you—is that the term "waterproof" in luxury vinyl flooring isn't as absolute as it sounds on the brochure.

Here's the thing: no vinyl floor is completely waterproof. Every manufacturer, including Karndean, makes a distinction between the surface being waterproof and the entire installation being impervious to water. The surface of Karndean LVT is indeed 100% waterproof—liquid sits on top, you wipe it up, no problem. But if water seeps into the seams between planks (especially if the subfloor is uneven or the install wasn't perfect), you can still get moisture underneath. That can lead to mold, adhesive failure, or even warping in extreme cases.

I ran a blind test with our quality team back in 2022: we took identical Karndean Art Select planks, installed them two ways—one with perfect subfloor prep and proper glue-down, one with slight gaps. Then we poured a measured amount of water over both. The first passed. The second? Water crept into the seams within 20 minutes. That experience cost us a $22,000 redo on a commercial project where the installer had cut corners.

So when Sarah asked for the straight truth, I told her: "The surface is waterproof. The installation can be made waterproof if you do it right. But I can't promise you 'completely waterproof' unless you follow our recommended installation guidelines and use the right adhesive."

The herringbone twist

Sarah specifically wanted Karndean herringbone vinyl flooring. She'd seen pictures of our Van Gogh collection in a herringbone pattern and loved the contemporary look. Herringbone adds a lot of seams compared to standard plank—more joints, more potential weak points. That means water intrusion risk goes up if you're not careful.

I'd just finished a specification review for a 3,500 sq ft herringbone project in February. The client had specified a loose-lay install, but after my team's analysis, we recommended switching to a full glue-down method for the herringbone areas. The loose-lay version—Karndean's Looselay—is great for floating installations, but for herringbone, the mechanical locking system plus the angle cuts make it harder to get a watertight seal. We documented that recommendation, and the client agreed. That project saved an estimated $6,000 in potential rework.

I shared that story with Sarah. "If you go with herringbone, go glue-down. It's a bit more work upfront, but it'll save you headaches."

The calculated risk

The upside of choosing Karndean: beautiful design, good warranty (lifetime residential, 10-year commercial for most collections), and a surface that's proven to handle daily spills. The risk: if the installer messes up or the subfloor isn't level, water could become a problem. I kept asking myself: is the aesthetic payoff worth the installation rigor?

Looking back, I should have emphasized the importance of hiring a certified installer rather than going with the cheapest quote. At the time, I assumed Sarah would already know that. She didn't. She later told me she'd almost gone with a handyman who quoted half the price. If I'd known, I'd have warned her more forcefully.

Here's what you need to know: according to FTC advertising guidelines (ftc.gov), any claim about a product being "waterproof" must be substantiated with evidence. Karndean's marketing materials are careful—they say "waterproof surface" not "waterproof floor." That distinction matters. When you're evaluating any LVT, ask the rep: "Show me the test data for seam water penetration." If they can't, that's a red flag.

What I learned (and what you can use)

Sarah ended up ordering 450 square feet of Van Gogh herringbone in a light oak shade. She chose a full glue-down installation, hired a certified installer I recommended, and the job went smoothly. A few weeks later she sent me a photo: the floor looked stunning, her stained glass window film was up in the bathroom, and she'd finally opened that crochet kit and was making a scarf for her kid. She even mentioned that the white tank top had survived a coffee spill on the new floor—wiped right up.

Small doesn't mean unimportant. It means potential. When I was starting out in quality inspection, the vendors who treated my small sample orders seriously are the same ones I give my $50,000 orders to now. Sarah may be one client today, but she's already referred two neighbors and a friend. That's the power of treating every customer—no matter their order size—with transparency and respect.

"The floor is great. And by the way, I'm making you a crochet coaster as a thank-you." — Sarah, 3 months later

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This story is based on actual quality inspection experiences at a Karndean distributor. Pricing, policies, and product specifications are accurate as of Q1 2025. The flooring market evolves, so always verify current installation guidelines and warranties with your local distributor.