Most floating floors sold today snap together without a drop of glue. That mechanism traces back to one Belgian company, Unilin, which developed glueless click locking and now licenses the technology to flooring makers around the world. If you have ever heard a plank make a satisfying snap as it seats into the last one, you have used a click joint that owes its design to Unilin.
Where the click system came from
Before glueless click, floating floors were held together with glue in the joint or nailed to the subfloor. Both were slow and messy, and mistakes were hard to undo. Unilin's breakthrough was a machined profile that lets one plank hook mechanically into the next, so the joint holds itself closed under normal foot traffic. No adhesive, no fasteners.
How the joint actually locks
Each plank has a tongue milled into one edge and a matching groove on the other. You present a plank at a slight angle to the row already down, then lower it, and the profiles fold and lock together. Short ends often use a drop-lock or push-down action instead. The two families you will hear about most:
- Angle / fold-down: tilt the plank in and press it flat; the long edge locks as it drops.
- Drop-lock (drop & lock): the end joint clicks down vertically once the long edge is engaged, handy in tight spaces against a wall.
- The finished joint resists horizontal pull and vertical lift, which is what keeps gaps from opening over time.
Why a licensed Unilin click matters
A locking profile looks simple in a diagram, but the tolerances are not. A licensed Unilin click is cut to a proven, tested geometry, so the joints seat tightly, stay closed, and can be taken apart and reused without chewing up the edges. Uncredited copies often loosen the tolerances to dodge the license, and that is where you get joints that gap, peak, or crack on the second install.
- Proven engineering: the profile is validated for repeated locking, not reverse-engineered by eye.
- Tight, durable joints: less chance of gaps, height differences (peaking), or edge damage.
- Reversible: planks can be lifted and relaid, which matters for repairs and for taking a floor with you.
- Defensible: a real license means the maker is not cutting corners on the one part that holds the floor together.
MILAT Floor builds its SPC planks on a licensed Unilin click, so the locking edge is the tested article rather than a lookalike. It installs tool-free, is reversible, and the joints are engineered to stay flat.
Installing with a licensed click: technique matters
A click floor rewards rhythm more than force. Long edges engage at an angle and fold down; short ends lock with a firm press or a gentle tap on a tapping block, never a bare hammer on the plank edge. The most common installer error is forcing a misaligned joint, which bruises the locking lip and leaves a gap that reappears forever after. Work in the sequence the instructions show, keep the first rows dead straight because every later row copies them, and clear grit from the groove before closing each joint. Speed comes from precision, not from hitting harder.
Why subfloor flatness makes or breaks the joint
The click mechanism assumes the two planks it joins are in the same plane. Lay it over a hump or a hollow and the joint is asked to bend, a job it was never designed for; under foot traffic that flexing works the lock loose and announces itself as creaks and gaps. This is why installation instructions state a flatness tolerance and mean it. Checking with a straightedge and levelling the low spots is dull work that determines whether the elegant Belgian engineering in the joint gets to operate as designed or spends its life under strain.
How a factory keeps a click profile honest
Licensing the geometry is step one; milling it correctly, plank after plank, is the daily work. The profile is cut into the SPC core by rows of precision tooling, and fractions of a millimetre decide whether joints close with a crisp, confident action or fight the installer. At MILAT Floor, click profiles are checked continuously against gauges, test-assembled from running production, and the tooling itself is maintained on a schedule, because a worn cutter quietly degrades every plank that passes it. A licensed profile from a disciplined line is what makes thousands of joints in a house behave identically.
The click joint in commercial service
Homes are gentle; commerce is not. In shops and offices the joints live under rolling castors, point loads, and traffic that never takes a day off, and the vertical locking of the short ends is what stops plank edges see-sawing under a repeated wheel. A properly milled licensed click spreads these loads through the interlock into the surrounding field. Combined with a rigid AC5-rated plank and disciplined subfloor prep, this is why floating click SPC can be specified in commercial settings that would once have demanded fully adhered flooring.
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