Click-Lock Flooring Systems Explained: Arc, Double and Single Click

A click-lock floor is a mechanical system disguised as a plank. The locking profile machined into its edges decides how it installs, how it behaves across a large room, and how it comes apart when a board must be replaced. The verified catalogue record for the click-lock laminate range lists three systems — Arc click, Double click and Single click — across core densities from 800 to 900 kg/m³ and thicknesses of 8, 12 and 15 mm. This guide explains what those options mean in practice.

How click systems work at all

Every click profile engages a tongue into a groove with a shaped lock that resists separation in the plane of the floor. The differences between systems are in the engagement motion — angle-in, fold-down or slide-and-snap — and in the lock's geometry, which trades installation speed against joint strength and reusability. Installers develop strong preferences, and their preference is data: the system your installer knows installs faster and fails less.

Arc click

The arc profile engages with a rotating, arcing motion of the incoming plank. It is the forgiving system: tolerant of minor subfloor undulation in feel, strong in long-edge lock, and friendly to large-format planks — the record's size sets run to 1210×198 and 1200×197 in the thicker boards. Arc systems suit wide-plank registers and rooms where long uninterrupted runs are the design.

Double click

Double click locks on two engagements — typically the long edge and the short end — giving the strongest assembled field and the best behaviour at thresholds and in heavy-traffic lanes. It is the commercial choice in the trio: slower to lay than a single-engagement system, more secure once laid, and the system to name where trolleys, luggage and chair castors will test the joints daily.

Single click

Single click engages one locking action — the fastest installation of the three, and the lightest joint. It serves residential and light-commercial programmes where speed and cost lead and traffic is kind. Specifying single click into a hotel corridor is the category's classic false economy; specifying double click into a spare bedroom is its mirror image.

Density and thickness: the other half of the specification

The click profile is only half the system. Core density — the record's ladder runs 800, 820, 840, 860, 880, 900 kg/m³ — sets indentation resistance and the lock's own strength, since the profile is milled from the core itself: a weak core makes a weak click regardless of geometry. Thickness (8, 12, 15 mm in the record) drives feel, sound and the floor's tolerance of subfloor imperfection. A complete click specification therefore reads: system, density, thickness, size — four facts. A quotation missing any of them is incomplete, and a receiving check that ignores them invites substitution.

Finishes ride on top

The same record lists ten surface finishes — embossed, EIR (embossed in register, where the texture follows the printed grain), fossil, crystal, hairlike, handscraped antique, mirror, high-gloss, piano and matt. Finish is the visible layer of the decision and the least structural; choose it after the system and the core, from physical samples, in the room's actual light.

Installation practice: where click floors are won and lost

The best-specified click floor fails under careless installation, and the failure points are always the same three. Subfloor flatness: a floating floor bridges nothing; undulations telegraph as movement and stress the locks with every step. Measure the subfloor, and let the thicker boards (12 and 15 mm) carry only the tolerance their record supports — never treat thickness as a licence to skip preparation. Expansion space: the floating field grows and shrinks with the room's climate; perimeter gaps, later covered by skirting from the accessories lines, are structural, and installers who close them to look tidy build in the buckling that appears in the first hot season. Acclimatisation and sequencing: boards rest in the room's conditions before laying, and rooms are laid in the programme's handover order, thresholds and transitions fitted as designed. None of this is exotic — it is the difference between a floor and a floor system, and it is why the installation method belongs in the same schedule as the product specification.

Keep one board of the chosen system, density and finish aside from every project — labelled, with its schedule reference. Floors outlive their paperwork unless someone keeps the physical reference: the retained board is how a replacement order three years later is matched exactly, how a damage dispute is settled in one photograph, and how the next project's specification starts from evidence instead of memory. The catalogue code names the product; the retained board proves it.