Admissible load calculator for profiles & sandwich panels
Calculate the admissible load for C/Z purlins, trapezoidal sheets and sandwich panels, or enter the design load and get the recommended profile. Size your roof or facade before preparing the quote.
Use the calculator
Calculate the admissible load or check what your profile can carry
Do you know the load and need to know which profile to use? Or do you have the profile and want to know how much it can carry? This tool answers both questions instantly, using technical data from Magon Steel and Master Panel. You can also find out which profile you need if you already know the design admissible load.
Selecciona la familia de perfil que quieres calcular.
What is the admissible load and how is it calculated per L/200?
The admissible load is the maximum external load —wind, snow, use— that a profile or panel can receive without exceeding the maximum permitted deflection. In steel structures, that limit is L/200: deflection cannot exceed the span length divided by 200.
The L/200 criterion comes from the Serviceability Limit State (SLS) of the Technical Building Code (CTE) and Eurocode 3 (EC3), part 1-3. Values are unfactored: they do not include additional safety factors or the self-weight of the profile.
In practice, for a purlin with a portal spacing of 6 m, the maximum admissible deflection would be 6,000 / 200 = 30 mm. The longer the span, the greater the height or thickness needed to stay within this limit.
fmáx = L / 200
- fmáx — flecha máxima admisible (mm)
- L — distancia entre apoyos (mm)
- Criterio: Estado Límite de Servicio
- Norma: EC3 parte 1-3 / CTE / EAE
- Los valores son sobrecargas no mayoradas
- El peso propio del perfil no está incluido
MG C and Z Purlins: how to choose the right profile
The MG C and Z metal purlins by Magon Steel are cold-formed S250GD steel profiles for supporting roofs and cladding of industrial buildings. Profile selection depends on three parameters: portal spacing, purlin spacing and number of spans.
The C-purlin works as a simply-supported beam, ideal for roof ends. The Z-purlin allows overlapping between adjacent pieces, creating structural continuity that increases load capacity by up to 35% compared to the equivalent C profile.
Available heights range from 125 to 300 mm with thicknesses of 2, 2.5 and 3 mm. The calculator filters in real time which combinations have available data according to the parameters you enter.
| Parameter | Purlin C | Purlin Z |
|---|---|---|
| Tipo estructural | Apoyo simple | Viga continua |
| Alturas (mm) | 125–300 | 125–300 |
| Espesores (mm) | 2 / 2,5 / 3 | 2 / 2,5 / 3 |
| Capacidad vs C | Base | +25–35% |
| Uso típico | Extremos | Vanos múltiples |
Trapezoidal sheet and corrugated MG profiles: which one to choose for your project
Magon Steel manufactures four profiled sheet types: the corrugated MG 18/76 for short spans, and the trapezoidal MG 30/206, MG 30/209 y MG 40/250 for longer spans. All CE-certified per UNE-EN 14782:2006.
| Perfil | H. onda | Vano máx. | Posición | Uso |
|---|---|---|---|---|
| MG 18/76 | 18 mm | 2,0 m | — | Fachadas, techos |
| MG 30/206 | 30 mm | 2,5 m | A / B | Cubiertas ind. |
| MG 30/209 | 30 mm | 2,5 m | A / B | Fachadas estéticas |
| MG 40/250 | 40 mm | 2,5 m | A / B | Grandes luces |
The difference between position A and position B refers to rib orientation: ribs face up in position A (roofs), ribs face down in position B (facades). This orientation significantly affects load capacity.
The rigid longitudinal overlap of MG 30 and MG 40 profiles guarantees watertightness with no risk of opening under wind or snow loads. Manufactured in S250GD steel per UNE-EN 10346.
Sandwich panel Master Panel: admissible load and insulation in a single element
The Master Panel sandwich panels integrate structural resistance and thermal insulation in a single element with a PUR/PIR polyurethane core. Values are calculated per EN 14509 for 2 spans and 0.50/0.50 mm sheet.
The Master-C Roof (30–120 mm) y el Master-F Facade (35–100 mm) are the reference panels for industrial construction. The Master-Modul (35, 40 y 50 mm) for modular construction, and the Master-Frigo (60–150 mm) specific for cold stores.
To select the correct panel, first choose the type, then the thickness and finally the span. If you enter a reference load, each thickness is automatically colour-coded: green (passes), yellow (at limit) or red (insufficient).
🌡️ Need to calculate thermal insulation? U-value and thickness calculator per CTE DB-HE →Frequently asked questions sobre admissible load for profiles
Answers to the most common questions about how to use the calculator and apply the results.
