Why load ratings get misread
A dance floor carries two distinct kinds of load at the same time. The first is static load: the mass of the floor itself, plus anything resting on it without moving — staging, a lectern, a heavy case parked on the surface, a flight case being wheeled across it. The second is dynamic load: impact and vibration from people moving, which is what a floor built for dancing actually experiences. A crowd of dancers does not apply a smooth, steady load; it applies repeated impacts of changing magnitude, concentrated on the feet of whoever is moving fastest.
Most published figures describe only one of these, and rarely say which. When a specifier sees a number like “1000 kg” next to a panel drawing, three questions have to be answered before that number can be used in a calculation: what area is it spread over, is it static or dynamic, and what is the safety factor already applied.
Static load: dead weight of the system
Dead load is straightforward because it can be calculated from published data. Each module has a stated panel weight, and dividing by the panel area gives a weight per square metre. That figure then applies to every square metre of floor laid, because the module repeats.
| Module | Panel size | Panel weight | Area | Dead load |
|---|---|---|---|---|
| 4x4' standard | 122 x 122 cm | 19.5 kg | 1.4884 m² | 13.10 kg/m² |
| 3x3' standard | 91 x 91 cm | 11.8 kg | 0.8281 m² | 14.25 kg/m² |
| 1x1m standard | 100 x 100 cm | 13.5 kg | 1.0000 m² | 13.50 kg/m² |
| 4x4' waterproof | 122 x 122 cm | 23.0 kg | 1.4884 m² | 15.45 kg/m² |
| 3x3' waterproof | 91 x 91 cm | 14.0 kg | 0.8281 m² | 16.91 kg/m² |
| 1x1m waterproof | 100 x 100 cm | 18.0 kg | 1.0000 m² | 18.00 kg/m² |
| Parquet | 80 x 80 cm | 10.0 kg | 0.6400 m² | 15.62 kg/m² |
| LED 2x2ft | 60 x 60 cm | 7.0 kg | 0.3600 m² | 19.44 kg/m² |
| LED 2x4ft | 60 x 120 cm | 14.0 kg | 0.7200 m² | 19.44 kg/m² |
Two observations follow from the table. First, dead load differs very little between the standard wooden modules — roughly 13 to 14 kg/m² — because the panel is thinner than the substrate it is built on, and the weight scales with area rather than with the number of joints. Second, the waterproof module carries roughly 2 kg/m² more dead load than the standard module of the same size, and LED panels sit well above both. On a 36 m² floor those differences are small in absolute terms, but they compound: they determine what the supporting subfloor has to carry, and they determine the freight weight that has to reach the venue.
Dynamic load: where the rated capacity actually applies
Dynamic load is the case that matters for a dance floor, and it is where published figures diverge most sharply. A rating expressed in kilograms per panel is almost always a static figure: the panel is loaded in a machine, or a known mass is placed on it, and the number that survives is recorded. A dance floor does not experience that.
Consider the published figure for the LED Starlit module, which states a loading capacity of over 1000 kg per panel. That figure is stated per panel, so the conversion to a surface rating depends on panel area:
| LED Starlit module | Panel area | 1000 kg spread over |
|---|---|---|
| 2x2ft (60 x 60 cm) | 0.3600 m² | 2778 kg/m² |
| 2x4ft (60 x 120 cm) | 0.7200 m² | 1389 kg/m² |
The same 1000 kg rating describes very different surfaces depending on which module is used. This is the clearest illustration of why a per-panel figure cannot be compared across products without knowing the panel area, and why a per-area figure cannot be compared without knowing the test method.
Converting between the two conventions
When a supplier publishes kg/m² and a layout is planned in panels, the conversion is arithmetic. Multiply the surface rating by the area of one panel to get the equivalent per-panel figure:
At 750 kg/m², a 1.4884 m² 4x4' panel corresponds to 1116 kg.
At 500 kg/m², a 0.8281 m² 3x3' panel corresponds to 414 kg.
At 400 kg/m², a 0.6400 m² parquet panel corresponds to 256 kg.
Going the other way, divide the per-panel rating by the panel area. The figure most often quoted on this site — over 1000 kg per panel on the 2x2ft LED module — works out to 2778 kg/m², which is a useful reminder of how much the two conventions diverge for small modules.
What a load rating does not tell you
A rated capacity is a statement about one panel under one test. It is silent on at least four things that matter on site, and a specification that relies on the number alone will still fail in practice.
Connection behaviour
Panels do not fail as isolated units; they fail at the joints. A panel can meet its rated capacity while the connector between two panels slips or buckles under a repeated off-centre load. This is where concealed locking systems and exposed screw patterns diverge, and it is discussed separately in the panel construction comparison.
Deflection
Deflection is the vertical movement under load. It is rarely published, and it is the parameter that most directly affects how a floor feels to dance on. A floor that meets its load rating but deflects visibly under a moving crowd will still produce complaints, because the complaint is about feel rather than failure.
Subfloor contribution
A modular floor is only as strong as what it stands on. A rating quoted for a panel tested flat on a rigid base does not transfer to a soft or uneven subfloor. Where the subfloor cannot provide a rigid support — a grass surface, a temporary deck, a sprung ballroom floor — the rating must be treated as indicative rather than as a design value.
Surface durability
Load capacity is not wear resistance. A panel can carry its rated load indefinitely and still lose its surface through abrasion, and a floor that has been used hard looks tired long before it fails structurally.
How to specify a load rating
When requesting load data from a supplier, the following five items make the answer usable rather than merely present:
Units and area basis. State whether the figure is per panel, per square metre, or per linear metre of run, and give the panel area if it is per panel.
Load type. Whether the rating is static, quasi-static (concentrated point load, such as a wheel or a foot), or dynamic.
Test description. How the load was applied and what was measured — deflection at a given load, or permanent deformation.
Safety factor. Whether one is already included. A figure quoted with a factor of three is not comparable to one quoted at failure load.
Subfloor condition. The base condition under which the figure was obtained.
With those five answers, a load rating becomes a design value that can be compared against the live load for the event. Without them, it is a marketing number that cannot be checked.
