Want to install solar panels? Check your roof type first! 

When installing solar panels, the roof is the foundation of the system. Each type of roof requires a different approach and a suitable mounting system. Choosing the wrong setup can lead to power loss, leaks or unsafe situations. In this blog, we outline the most common roof types and their related challenges, with practical tips for selecting the right mounting system: 

1. Tiled roof (pitched roof with tiles) 

The tiled roof is by far the most common roof type in The Netherlands, making it a logical choice for many solar panel installations. Thanks to the variation in orientations and slopes, there are plenty of possibilities. Still, there are a few things to look out for. There's a real risk of breaking tiles during installation, especially with older or porous tiles. Also, placing tile hooks requires extreme precision, as incorrect placement can cause leaks. Tiled roofs are rarely uniform in size, so custom solutions are often necessary to ensure a safe and effective result. 

Tips 

• Use mounting systems with adjustable roof hooks for a perfect fit 

• Replace damaged tiles immediately to prevent leaks 

• Use roof scans or photos beforehand to identify the tile type 

• Choose systems like [Esdec ClickFit] or [Van der Valk ValkPitched] for reliable installation 

2. Steel roof (steel sheets or sandwich panels) 

This roof type is lightweight and quick to install, ideal for buildings with a light roof structure. However, mounting requires accuracy: screws must be placed precisely on the underlying profile to avoid damaging the insulation. Sandwich panels have limited load-bearing capacity, which directly affects the choice of mounting system. 

Tips 

• Use systems with self-tapping screws that align exactly with the roof corrugation or rib 

• Ensure rubber seals at fastening points 

• For sandwich panels, choose systems with minimal thermal load, such as [Esdec FlatFix Fusion Light] 

• Always fasten to the substructure, not just the sheet material 

   

3. Corrugated roof (e.g. fibre cement or plastic) 

Thanks to their large, often shadow-free surface, corrugated roofs are an attractive option for solar panels. However, this roof type comes with challenges. The material is fragile, so there's a risk of breakage when walking on it. Heavy systems are not suitable and the wavy shape makes standard mounting tricky. A lightweight, adapted mounting system is essential for a safe and lasting installation. 

Tips 

• Use special mounting systems with brackets over the wave, not into it (e.g. [Van der Valk ValkBox3]) 

• Avoid walking directly on the sheets, use walk boards instead 

• Check the material for harmful substances, such as asbestos or fibre cement, before starting installation 

• Keep sufficient distance from the roof edge due to wind load 

4. Flat roof (bitumen, EPDM or gravel roof) 

A flat roof offers complete freedom in the placement and orientation of solar panels, without the limitations of tile patterns or roof shapes. This flexibility makes it a popular choice, especially in renovations or new builds. At the same time, this roof type requires special attention, such as wind load on elevated systems and the risk of leakage from penetrations. The weight of the required ballast must also be carefully matched to the roof's load-bearing capacity. A carefully selected mounting system is crucial. 

Tips 

• Choose ballast-free systems for roofs with low load capacity, such as [FlatFix Fusion] with roof anchoring 

• Leave enough space between panel rows to avoid shadowing 

• Ensure proper cable management and avoid sharp edges 

• Always perform a structural assessment before getting started., especially for older or lightweight buildings 

5. Wavy or irregular industrial roof 

Industrial roofs with non-standard shapes often offer large surface areas, making them ideal for bigger solar installations. However, standard mounting is rarely an option. These shapes require custom profiles or a specific project solution that fits the roof type and supporting structure. Proper preparation and precise engineering are essential for a safe and efficient installation. 

Tips 

• Use systems with adjustable mounting profiles or rails 

• For large roofs, account for thermal expansion 

• Ensure firm attachment with continuous rails or gutter brackets 

Get proper advice 
At ESTG, we know that the right solar mounting system can make the difference between a safe, long-lasting setup and a project full of risks. We’re happy to help with advice on load capacity, material choice, mounting systems and compatibility. From design to delivery: we’re here to support you. 

Please contact our team for tailored technical advice.