If you're looking at Karndean flooring, you've probably noticed there's more than one way to install it. Not just glue versus click, but different types of glue-down and different types of click systems. And if you're like I was back in early 2022, you might assume they're all pretty much the same.
I assumed that. I was wrong. And that mistake cost me $3,200.
Here's what I learned: there's no "best" Karndean installation method. There's only the right method for your situation. The trick is knowing which questions to ask before you decide.
Three Installation Methods, Three Different Use Cases
Before I get into the mistake, let me lay out the three main Karndean installation options and what they're actually good for. Based on my experience and conversations with installers who've done more of this than I have, here's the breakdown:
1. Loose Lay (Karndean Looselay)
How it works: The planks have a special backing that grips the subfloor. No glue required except at the perimeter and seams.
Best for: Commercial spaces where you might need to access the subfloor later (think underfloor heating repairs). Also good for large open areas with minimal doorways or obstacles.
The catch: It doesn't work well in rooms with lots of small cuts or heavy rolling loads (like appliance dollies).
2. Glue Down (Karndean Opus, Da Vinci, Van Gogh)
How it works: Each plank is adhered directly to the subfloor with a full-spread adhesive.
Best for: High-traffic commercial spaces, areas with heavy furniture, and rooms where you want a completely seamless look.
The catch: The subfloor must be perfectly prepared. I'm talking flat, clean, and dry. Any imperfection shows through. And once it's down, it's not coming up easily.
3. Click Lock (Karndean Korlok, Rigid Core)
How it works: Planks lock together mechanically. No glue. Often has a built-in underlayment.
Best for: DIY installers, rooms with inconsistent subfloors, and situations where you want the option to replace individual planks later.
The catch: The click mechanism creates slight movement, which can cause seam separation in extreme temperature fluctuations. Also, the extra layers make it slightly thicker than glue-down.
My $3,200 Mistake: The Wrong Method for the Wrong Room
In September 2022, I specified Karndean Van Gogh for a commercial office space. About 1,200 square feet. The client wanted a wood-look floor that could handle rolling desk chairs and occasional water spills from the break area.
I recommended glue down. Seemed obvious. It's durable, water-resistant, and professional. We ordered the materials, prepped the subfloor, and installed it over a weekend.
The problem? The subfloor wasn't as flat as I thought. There was a 1/8-inch depression near the window that I'd missed during inspection. With glue-down, that depression translated into a visible dip in the floor surface. It caught the light wrong. It looked wrong.
We had to tear out a 400-square-foot section and redo it. The cost: $3,200 in materials, labor for removal, and a new adhesive order. Plus a week delay while the client's office sat half-finished.
Here's what I should have done: asked the client about their subfloor condition before I chose the method. If I'd known about the depression, I would've recommended Karndean Korlok (rigid core click). The built-in underlayment and locking system would have bridged that dip without showing it.
How to Know Which Method Is Right for You
Okay, so now you know the three methods. But how do you pick? Here's a simple decision tree I now use (and I wish I'd had it before that $3,200 mistake):
Ask yourself these questions in order:
- Is the subfloor perfect? (Flat within 1/8 inch over 10 feet) → If yes, you can consider glue-down. If no, skip to question 2.
- Will the room have rolling loads? (Heavy furniture, appliance dollies, or rolling desk chairs) → If yes, loose lay is risky. Go with glue-down or rigid core click.
- Do you need future access to the subfloor? (Underfloor heating, plumbing access) → If yes, loose lay is your best bet.
- Are you installing it yourself? → If yes, click lock (Korlok) is the most forgiving for DIY. If hiring a pro, any method works.
- Is the space temperature-stable? (No extreme heat/cold, direct sunlight) → If unstable, avoid click lock. The mechanism can fail with thermal expansion.
Based on your answers, here's the quick recommendation:
- Glue down (Opus, Da Vinci, Van Gogh): Perfect subfloor + high traffic + professional install
- Loose lay (Looselay): Fluctuating subfloor + future access needs + large open space
- Click lock (Korlok, Rigid Core): Imperfect subfloor + DIY install + stable environment
The One Decision Tool That Would Have Saved Me $3,200
I mentioned earlier that I now maintain a pre-installation checklist for my team. After the Van Gogh disaster, I added one specific step that's saved us from similar mistakes:
The subfloor profile test. Before choosing the installation method, we lay a 6-foot straightedge across the subfloor in the room's longest dimension. We mark every point where the gap exceeds 1/16 inch. If we find more than two gaps in a 10-foot section, we don't use glue-down. Period.
We've caught 47 potential errors using this checklist in the past 18 months. That's 47 projects that didn't end up costing someone $3,200.
So here's my advice: don't just pick a Karndean product based on looks. Pick the method based on your floor. It's the difference between a beautiful installation and a costly mistake.
Bottom line: Know your subfloor before you know your flooring. Trust me on this one.
