Every click floor locks, but not the same way. The locking type decides how planks go together, how fast a room gets laid, and how the floor behaves at its joints for the next decade. As a manufacturer milling these profiles daily, here is a plain-language tour of the main types.
Angle-angle: the classic
In an angle-angle system, both the long side and the short side lock by tilting the plank into its neighbour and folding it down. It produces a strong, tight joint and is the most widely proven approach. The trade-off is that each plank needs room to be angled in, which slows work in tight spots like under door frames.
Drop-down (push-down) short sides
Drop-down systems keep the angled long side but let the short end lock by pressing it straight down until it clicks. Rows go in noticeably faster, and awkward last-row and doorway planks get easier. The short-side joint relies on a precisely milled locking element, so profile accuracy matters even more.
Fold-down with locking insert
The most developed drop-down variants add a separate insert or tongue in the short-side groove that snaps over the incoming plank, boosting the vertical strength of the pressed joint. These systems combine the speed of drop-down with joint strength closer to angle-angle.
What matters more than the type: the licence
Click geometries are patented engineering, licensed by their developers to manufacturers. A licensed profile is produced to the licensor's specification with the tolerances the design assumes. Unlicensed copies imitate the shape without the discipline — and the difference shows up as joints that gap, peak or fail under traffic. MILAT builds on a licensed Unilin click system: a genuine licence, not an imitation.
Choosing in practice
- For most floors, the locking type matters less than profile quality and licensing.
- Installers on large projects often prefer drop-down short sides for speed.
- Whatever the type, confirm the licence and test-fit two planks from your sample box.
What happens inside the joint over ten years
A click joint is not static; it works for a living. Every footstep flexes it fractionally, every season moves it, every furniture drag loads it sideways. A precisely milled joint takes this in stride because its mating surfaces bear evenly and return to position. A sloppy joint wears at its contact points instead, and the wear compounds: a little play becomes a visible gap, the gap collects grit, and grit accelerates the wear. This is why joint quality shows up in year five rather than in the showroom — and why the milling tolerance matters more than the geometry printed in the catalogue.
The installation habits that break good locks
Most joint failures we inspect were manufactured on site, not in the factory. The repeat offenders are familiar: hammering planks together with a bare mallet instead of a tapping block, forcing an angle-angle profile to lie flat before it is seated, standing on an unlocked short end, and cutting the expansion gap so tight that seasonal movement loads every joint in the room. A licensed profile tolerates careful assembly indefinitely; no profile tolerates brute force. If a plank will not close, something is misaligned or there is debris in the groove — force is never the missing ingredient.
Taking a floor apart: not all clicks reverse equally
One quiet advantage of quality click flooring is that installation runs in reverse. Angle-angle joints open the way they closed, by lifting the row and rotating out, which makes lifting a floor for a leak, a repair or a house move genuinely practical. Fold-down short ends with locking inserts prioritise fast installation, and some designs release less gracefully — worth knowing before you buy if reusability matters to you. Licensed Unilin profiles are engineered for disassembly and reassembly, which is exactly what plank replacement and section repairs depend on.
The subfloor loads the joint more than feet do
Joints and subfloors are one system. Over a dip, planks bridge like a small beam and every step levers the locks at each end; over a high spot, the floor pivots and the surrounding joints carry the rock. Multiply by thousands of footsteps and even an excellent profile fatigues. The practical conclusion runs opposite to instinct: if the budget forces a choice, spend on subfloor preparation before spending on a premium plank, because a good joint on a bad subfloor fails before a fair joint on a flat one.
How a factory keeps a profile honest
From the manufacturing side, a click profile is a precision-machining problem that never ends. Milling tools wear with every metre of board they cut, and as they wear, the profile drifts away from its nominal geometry. A disciplined factory measures profiles continuously, replaces tooling on schedule rather than on failure, and pull-tests joints from production as routine — obligations that a Unilin licence formalises with the licensor's specifications and oversight. An unlicensed copy may match the drawing on its best day; the licence system exists to make sure the millionth plank still matches it.
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