The Two Camps: Glue-Down Rigidity vs. Grip-and-Go Flexibility
If you're managing a flooring upgrade for your office—say, 3,000 square feet of open-plan space or a dozen meeting rooms—you've probably run into the big question about Karndean: rigid core vs. loose lay.
As someone who's been wrangling vendor quotes and installation schedules since 2021, I've gone back and forth on this myself. Let's break down what actually matters when you're the one signing off on the purchase order.
Here's the comparison framework: We're looking at three key dimensions—installation complexity, floor preparation requirements, and long-term maintenance. By the end, you should have a clear sense of which approach fits your specific project.
Dimension 1: Installation Complexity (Time & Skill Required)
The Korlok Click System: Tighter Fit, More Patience
Karndean's rigid core products, like the Korlok Select line, use a click-lock mechanism. I've watched our installer work with this on a 2,000 sq ft floor. It's precise work—each plank needs to be angled and clicked into place, and you really can't rush it.
What this means for you: Expect a minimum of 2-3 days for a mid-size commercial space (1,500–2,500 sq ft). The installer needs to be fairly experienced with LVT click systems. Our guy had been doing it for about 5 years, and he said the Korlok was "medium difficulty"—not the hardest, but not a beginner job.
Here's a surprise (at least it was for me): the click system actually worked better in rooms with a lot of corners and obstacles. The ability to cut planks and snap them in place individually gave us more control around columns and door frames.
The Loose Lay System: Faster but Tricky in Its Own Way
Karndean's loose lay planks (like those in the Van Gogh collection) have a textured backing that grips the subfloor. No adhesive, no locking mechanism—just lay them down and trim to fit.
On paper, this sounds easier. In practice? It can be faster for large, uninterrupted spaces. For a 1,500 sq ft open area, our installer finished in about a day and a half. But here's the trade-off: loose lay requires near-perfect subfloor flatness. Even small dips mean the planks can shift or gap over time. (We learned this the hard way on a project that had a slightly uneven concrete slab—had to redo 400 sq ft. That set us back a week and $1,200 in materials.)
The bottom line on complexity: If you have a complex floor plan with lots of cuts and corners, rigid core (click) is probably your better bet. If it's a wide-open space with a flat subfloor, loose lay can save you a day of labor—but only if your prep work is spot on.
Dimension 2: Floor Preparation Requirements (The Hidden Cost Driver)
Rigid Core: Forgiving of Minor Imperfections
One thing I really appreciate about Karndean's rigid core is that it tolerates subfloor variances up to about 3/16" over 10 feet. That's not a huge margin, but it's enough that you might avoid a full self-leveling compound pour.
In our case, we planned for a leveling compound cost of about $1.50–$2.50 per square foot. But because the rigid core was a bit more forgiving, we only needed spot-leveling on about 15% of the area. That saved us roughly $3,000 on a 2,000 sq ft project.
As of January 2025, that's the kind of saving that makes a real difference in a commercial budget. Prices for leveling compounds have gone up about 8% year-over year, so any way to minimize that is welcome.
Loose Lay: The Uphill Battle for Flatness
Loose lay is less forgiving. Karndean recommends a flatness tolerance of 1/8" over 10 feet. Exceed that, and you'll likely see the planks shifting, gapping, or even curling at the edges.
During our second project (the one we had to redo), we learned that the subfloor had a high spot of about 1/4". That little bump caused the loose lay planks to lift at the joint. The manufacturer's warranty actually requires that flatness tolerance, so we had no choice but to grind it down and re-level. That added 2 days to the schedule and about $1,800 in labor and materials.
Verdict on preparation: If you're working with an older building where the slab condition is unknown, rigid core gives you more breathing room. Loose lay is a better fit for new construction or recently leveled floors where you know the flatness is already within spec.
Dimension 3: Long-Term Maintenance and Repairs
Rigid Core: Easier to Fix in Sections
Here's a practical consideration that's relevant for commercial spaces: what happens when a section gets damaged? Heavy furniture being dragged, a spill that seeps into a joint, or just normal wear in high-traffic areas.
With rigid core click systems, you can replace individual planks—if you have access to the edge. In an open room, that's straightforward. In a room with permanent fixtures (like built-in cabinetry), it's harder because you need to unlock from the side. But it's still doable.
We've had to replace about 6 planks in our conference room over 3 years. Each one took our maintenance crew about 20 minutes. Not a huge deal.
Loose Lay: Simple Fix but Higher Risk of Repeat Issues
Loose lay planks are actually easier to replace individually—just lift them up and put new ones in. No cutting, no unlocking. The challenge is that if the subfloor issue causing the problem isn't fixed, the new plank will face the same fate.
Our redo taught me this lesson: after we fixed the high spot, the loose lay has been fine for 2 years. But that 1/4" variance caused the original planks to fail within 6 months. So the repair was easy, but the root cause was the floor prep.
Maintenance conclusion: Both systems are repairable, but loose lay requires you to be more diligent about the subfloor. If you're confident in your slab condition, loose lay is simpler to fix. If there's any uncertainty, rigid core gives you more insurance.
So, Which One Should You Choose?
Based on what I've seen across multiple projects (and a couple of costly mistakes), here's my honest recommendation:
Choose Karndean rigid core (Korlok Select or Art Select) if:
- You're working with an older building or unknown subfloor condition
- The floor plan has lots of corners, columns, or irregular shapes
- You want a more forgiving installation window (less critical on flatness)
- Your budget allows for a slightly higher material cost (rigid core is roughly 10–15% more expensive per square foot than loose lay, as of early 2025)
Choose Karndean loose lay if:
- The subfloor is newly leveled or you're certain it meets the tight flatness spec
- You have a large, open area with minimal obstacles
- You want faster installation (saves roughly 1 day per 1,500 sq ft)
- You need lower material costs upfront
I realize that might sound like a cop-out answer, but trust me—the wrong choice for your specific situation can cost you thousands. If your subfloor is iffy and you go loose lay, you might end up re-doing it. If your subfloor is perfect but you pay extra for rigid core, you've wasted money you could have spent elsewhere.
Take it from someone who's been burned: spend the time checking your subfloor first. That's the single best way to make this decision. And if you're still on the fence, go with rigid core. It's more expensive, but it's also more forgiving—and for a commercial project, that peace of mind is often worth the premium.
Pricing as of January 2025. Verify current rates with your distributor—material costs have been volatile in this space.
