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Modular design: Roof hook and mounting rail

Key factors of the mounting system

Decisive for a mounting system are the load-bearing capacity, easy mounting and especially the modular design.

Since the roofs - whether for small private systems, commercial systems or larger projects - have very different requirements in most cases, K2 Systems offers a product portfolio based on the modular principle, so that a very high level of functionality can be achieved with just a few components. The various roof hooks can be connected to the SolidRail using the T-Bolt or to the SingleRail using the Climber. The SolidRail roof hooks can also be combined with the SingleRail using the L-Adapter. Finally, the solar modules are fixed on both mounting rails with the OneMid universal clamp.


The modular principle not only saves transport and storage costs, but also means less planning and installation work for installers on different projects.

Various parameters determine the choice of roof fastener

The choice of the right roof hook, hanger bolt or solar fastener depends on several parameters such as the roof properties or the estimated loads. The most important factors are presented below:

1. Roof covering

1. Roof covering

The roof covering determines the type of roof fastener. On a tiled roof, a roof hook is usually used, while a corrugated fibre cement roof requires hanger bolts. Solar fasteners are used on trapezoidal metal or corrugated sheets and suitable standing seam clamps are used on metal seam roofs.

 

2. Roof conditions

2. Roof conditions

Another parameter is the properties on the roof. These include, for example, the tile height, the rafter width and rafter spacing, the slat spacing or the type of roof substructure (wood, steel or concrete).

 

These properties are taken into account during the design in Base On directly in the "Roof" tab.

 

3. Conditions of the location

3. Conditions of the location

The location and the associated snow and wind loads as well as the required corrosion protection have a further influence.

 

The loads result in individual static requirements that are automatically determined in the "Loads" tab of Base On.

 

4. Further characteristics

4. Further characteristics

The properties of the solar modules (e.g. frame height of the solar module), the inverters and the cabling also have an influence on the planning of the mounting system. These properties are also considered via the input masks in Base On.

Derivative: Suitable mounting rail and module clamp

Once the various properties of the roof have been entered and the corresponding module surfaces defined, the Base On online tool automatically calculates the suitable SingleRail or SolidRail mounting rail. Finally, the solar modules are fastened using the universal module clamp OneMid or OneEnd (clamping range 30-50mm).

 

The Base On user receives at the end a detailed installation plan with all previously entered parameters and an article list as well as a static proof for the project.

Modular principle in practice: Two example projects

The two pitched roof projects are realized with the same SingleRail mounting rail and the OneMid and OneEnd clamps. Only the roof fasteners differ due to the special roof properties:

 

  • CrossHook 3S (top): Suitable for pantiles, multiple height adjustment, can also be used on narrow rafters
  • Hanger bolt (bottom): Suitable for corrugated fibre cement or corrugated sheet metal coverings, including pre-assembled adapter plate

Next determination: Mounting rail and module clamp
 

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