Mounting Systems for Solar: Roof-Mount, In-Roof, Flat Roof, Facade and More

The choice of the right mounting system is crucial for the yield, longevity and economics of a photovoltaic system. Depending on roof type, building situation and aesthetic requirements, various systems are available — from classic roof-mount to ground-mount with tracking systems. This guide compares all common mounting types with their pros, cons, costs and applications.

Comparison Table: Mounting Systems at a Glance

Comparison of the six mounting system types | As of January 2026

Feature	Roof-mount	In-roof	Flat roof	Facade	Carport	Ground
Typical cost (EUR/kWp)	150-250	300-500	100-200	400-700	350-600	80-150
Roof pitch	15-60 deg	15-60 deg	0-5 deg	90 deg (vertical)	Variable	Freestanding
Aesthetics	Visible, raised	Flush, elegant	Invisible from below	Architectural element	Functional	Standalone
Installation	Simple	Complex (roofer needed)	Medium	Complex (facade specialist)	Complex (structural)	Medium to complex
Structural requirement	Low to medium	Medium	Medium (ballast)	High	High	Low
Rear ventilation	Good (gap to roof)	Limited	Good (tilted mounting)	Plannable	Good	Very good
Maintenance access	Good	Difficult	Very good	Difficult	Good	Very good
Suitability	Pitched roof, standard	New build, renovation	Commercial, apartments	Office buildings	Parking areas	Large-scale systems

Roof-Mount (Pitched Roof)

Roof-mount is by far the most common system. Solar modules are fixed above the existing roof covering using roof hooks, mounting rails and module clamps.

Structure and Components

1. Roof hooks: Stainless steel hooks are fastened to the rafters beneath the roof tiles. Depending on tile type, adapted hook shapes are available (universal hooks, beaver-tail hooks, flat tile hooks).
2. Mounting rails: Aluminium profiles are screwed crosswise or lengthwise onto the roof hooks, forming the support structure.
3. Module clamps: Mid-clamps (between two modules) and end clamps (at the edges) secure the modules to the rails. Important: module height and clamp type must match.
4. Earthing: All conductive parts are connected via equipotential bonding.

In-Roof Mount

With in-roof mounting, the solar modules replace part of the roof covering. They are integrated flush into the roof surface, forming a visually uniform area.

Structure and Features

The modules are placed in a special frame (e.g. from Solrif, GSE, Viridian) that takes over the function of the roof tiles. Side sealing profiles and a drainage system channel rainwater. The substructure is fixed directly to the rafter battens.

Important: Water drainage must be professionally planned. Transitions between the module field and regular roof covering are the critical points for potential leaks.

Flat Roof Mount

On flat roofs (0-5 degree pitch), modules are either tilt-mounted or ballast-mounted to achieve the optimal tilt angle.

Tilt Mounting vs. Ballasting

• Tilt mounting with roof penetration: Metal frames are anchored in the roof structure. Advantage: very stable, even in strong wind. Disadvantage: roof membrane is penetrated (sealing required).
• Ballasting (penetration-free): Frames are weighted down by concrete slabs or gravel. Advantage: no roof penetration, roof sealing remains intact. Disadvantage: high roof load (15-25 kg/m2), not possible on every roof.
• Aero systems: Aerodynamically shaped trays that partially convert wind into downforce. Lighter than pure ballasting (8-12 kg/m2).

Facade Mount

Facade mounting uses vertical building surfaces for power generation. Modules are mounted as a ventilated rainscreen facade or cold facade.

Ventilation Options

• Ventilated rainscreen facade: Modules are mounted 3-5 cm from the wall. Air circulates behind the modules, removing heat and moisture. This is the standard for PV facades.
• Cold facade: Similar to rainscreen, but with a larger ventilation cavity and integrated insulation layer. Combines weather protection, insulation and power generation.
• Warm facade (rare): Modules directly on the insulation — not recommended due to heat build-up.

Carport and Pergola

Solar carports and solar pergolas use parking or terrace canopies as mounting surfaces. The modules simultaneously form the roof of the structure.

Structural Notes

Carport structures must be structurally calculated as standalone buildings. To consider:

• Snow load per local standards (depending on snow load zone and roof pitch)
• Wind load per local standards (carports are often freely exposed to wind)
• Dead weight of modules plus substructure (approx. 15-25 kg/m2)
• Foundations: Point foundations or strip foundations, depending on ground conditions

Ground-Mount

Ground-mount systems are erected on open terrain — typical for solar parks from 100 kWp to the megawatt range. Two basic concepts are available: fixed-tilt and tracking systems.

Trackers vs. Fixed-Tilt

• Fixed-tilt: Modules on metal frames at a fixed angle (approx. 20-30 degrees south-facing). Affordable, low-maintenance and proven.
• Single-axis tracker: Modules follow the sun’s path from east to west. Additional yield: 15-25% over fixed-tilt. Additional cost approx. 15-20%.
• Dual-axis tracker: Tracking on both axes (azimuth and elevation). Additional yield: 25-35%, but significantly more expensive and maintenance-intensive. Rarely economical in Central Europe.

Cost Comparison of Mounting Systems

Ground-mount115 EUR/kWp

Flat roof150 EUR/kWp

Roof-mount200 EUR/kWp

In-roof400 EUR/kWp

Carport475 EUR/kWp

Facade550 EUR/kWp

Typical mounting costs (average of min/max range)

Mounting costs are only part of the total cost of a PV system. Modules, inverter, wiring, planning and grid connection are added. When choosing the mounting system, you should consider not only the pure mounting costs but also the expected additional yield (e.g. optimal orientation on a flat roof) and saved materials (e.g. roof tiles with in-roof).

Structural Assessment: When is an Expert Needed?

Frequently Asked Questions about Mounting Systems

Which mounting system is best for a single-family home?

For standard single-family homes with a pitched roof, roof-mount is the classic choice: proven, affordable (150-250 EUR/kWp), good rear ventilation and simple installation in 1-2 days. For new builds or roof renovations, the more elegant in-roof mount may be worthwhile, but is significantly more expensive.

Do I need a structural assessment for my solar system?

For standard pitched roofs with roof-mount up to approx. 20 modules (built after 1990), no separate structural assessment is needed. It is mandatory for flat roof ballasting, carport structures, facade mounting and older roofs with uncertain load-bearing capacity.

What is the difference between roof-mount and in-roof mounting?

With roof-mount, modules are installed above the roof tiles — cheaper and better rear ventilation. With in-roof mount, modules replace the tiles for a flush look — more expensive, but more aesthetic. In-roof has approx. 2-5% less yield due to limited rear ventilation.

Is an east-west layout on a flat roof worthwhile?

Often yes — east-west allows smaller row spacing and up to 30% more modules on the same area. The yield per kWp is approx. 10% lower, but the total yield per square metre of roof area is higher. Additionally, generation is distributed more evenly across the day — ideal for self-consumption.

How much does a solar carport cost?

A solar carport including structure costs approx. 350-600 EUR/kWp. Note the building permit requirement in most regions and the necessary structural calculation. The advantage: dual use as shelter and power generation, ideal for EV charging stations.

Can I mount solar modules on the house facade?

Yes, as a ventilated rainscreen facade. The yield is approx. 60-70% of a roof system (vertical mounting), with better winter yield due to the lower sun angle. Cost: 400-700 EUR/kWp. Worthwhile for office buildings or when additional area beyond the roof is needed.

Conclusion: Which System Suits Your Project?

The choice of mounting system depends primarily on the available area, budget and aesthetic requirements:

• Single-family home with pitched roof: Roof-mount is the standard — proven, affordable and efficient.
• New build or roof renovation: In-roof mount for an elegant solution, if the budget allows.
• Commercial building with flat roof: East-west tilting maximises yield per square metre.
• Representative buildings: Facade PV as an architectural statement.
• Parking areas with EV charging infrastructure: Solar carport combines shelter and power generation.
• Large open areas: Ground-mount with the lowest cost per kWp.

Regardless of system: have the structural capacity checked, commission a certified installer and look for high-quality substructures made of aluminium or stainless steel — the mounting must last 25-30 years.