Flat roof brackets

Flat roof mounting systems allow for the secure installation of solar modules, usually without drilling into the roof membrane. These ballasted mounting systems are secured by weight rather than screws, thus protecting sensitive roof seals from damage. Whether you need variable mounting options for optimal tilt angles or compact ballast trays – at PVundSO you'll find the right system for every flat roof.

The strengths of flat roof mounting systems

Professional flat roof mounting systems offer unique advantages:

• No roof penetration: Ballasting instead of drilling protects the sensitive roof membrane from leaks and damage.
• Flexible tilt angle: Adjustable systems allow for optimal alignment with the sun – up to 30% more yield than with flat mounting.
• Simple installation: Set it up, weigh it down, done – no special tools or roofers required.
• Reversible assembly: Can be removed without leaving a trace if required – ideal for tenants or temporary installations
• Versatile: Works equally well on garage roofs, carports, terraces and in the garden.
• Robust materials: High-quality aluminum constructions for decades of weather resistance

When is a flat roof the ideal location?

Flat roof mounting is perfectly suited for various situations:

For unused roof areas: Garage, carport, or outbuilding with a flat roof? These areas are often optimally exposed to sunlight and unshaded – perfect for solar panels. They utilize space that would otherwise remain unused.

If drilling is not possible: For rental properties, sensitive seals, or if you do not want to damage the roof membrane, ballasted mounting is the ideal solution.

For optimal yields: Mounting brackets allow you to achieve a better tilt angle. This results in significantly higher yields than vertical wall mounting or flat installation.

Proven systems for every need

We offer various mounting systems for different requirements:

Variable mounting system: Our bestseller for maximum yield. The adjustable design with four support legs (two short, two long) allows for optimal tilt angles from 10 to 30 degrees. The legs are either drilled into ballast elements such as lawn edging stones or can be screwed directly into the roof. Flexible use on flat roofs, in the garden, or even on walls.

ValkBox system: A compact, complete solution with rubber pads to protect the roof. Stable and wind-resistant due to its low-profile design. Ideal for easy installation and when the position needs to be changed later. Ballasting is achieved using standard paving slabs.

Wind-optimized ballast trays: For exposed locations, closed tray systems like the Renusol tray offer optimal wind protection. The closed sides significantly reduce the wind resistance. The trays can be filled with any type of ballast.

Trapezoidal sheet metal variants: Special systems for flat roofs made of trapezoidal sheet metal. Short rails are screwed to the roof and the solar modules are attached to them with clamps.

How much ballast do I need?

Proper ballasting is crucial for the safety and wind stability of your system. Too little weight can be dangerous in a storm, while too much puts unnecessary strain on the roof.

Important influencing factors: Wind load should never be underestimated. It increases considerably with building height, wind zone, and the tilt angle of the modules. Germany is divided into four wind zones – from wind zone 1 (inland areas) to wind zone 4 (coastal regions and islands). For buildings taller than 10 meters or in exposed locations, you should plan for additional ballast. The steeper the tilt of the modules, the larger the surface area exposed to the wind and thus the greater the ballast requirement.

Rules of thumb for safe ballasting:

• Approximately 80-100 kg total weight per solar module
• Significantly more ballast in coastal regions or particularly windy locations.
• The higher the module is mounted, the more surface area it offers to the wind.

Important note: The exact ballasting must be carried out according to the manufacturer's instructions . Each system has specific requirements depending on the wind zone, building height, and angle of inclination. Be sure to follow the supplied calculation tables.

Ballast materials and their properties: Lawn edging stones are ideal for variable mounting systems – they have pre-drilled holes and can be drilled directly. Paving slabs offer even weight distribution and are stackable. Gravel or crushed stone are suitable for trough systems, but are more difficult to measure.

Also check the permissible roof load and whether your roof can easily support the additional weight.

What should you consider when buying a flat roof bracket?

Choosing the right flat roof mounting system depends on your roof. First, check the load-bearing capacity of your flat roof.

When mounting the modules in a row, ensure sufficient spacing between the rows to prevent shading. Compact systems like the ValkBox require less space but have a fixed tilt angle.

At PVundSO, you'll find professional flat roof mounting systems that don't require roof penetration. All systems are ballasted, protect your roof, and can be removed without leaving a trace if needed. Our experts are happy to advise you on selecting the optimal solution for your flat roof.