Installing solar panels on industrial roofs requires much more than simply selecting a structure compatible with the photovoltaic module. In a factory or industrial building, the solution must be adapted to the roof type, the permissible loads, the mounting system, the environmental conditions, and the expected lifespan of the installation.
Therefore, correctly comparing solar roof structures before choosing a system allows you to reduce risks during installation, avoid compatibility problems, and improve the durability of the photovoltaic project.
By 2026, solar engineers and project managers should be evaluating factory solar structures using a methodology that combines structural engineering, roof characteristics, corrosion resistance, ease of assembly and maintenance.
In this guide we explain the main criteria for comparing photovoltaic structure solutions intended for industrial roofs.
What are solar roof structures?
Solar roof structures are the systems used to fix and support photovoltaic modules on the roofs and coverings of industrial, commercial or logistics buildings .
Its function is to transmit the loads generated by the panels and by environmental conditions to the roof or the resistant structure of the building, while maintaining the stability and safety of the system.
Depending on the type of roof and the project solution, the following systems can be used:
- Coplanar.
- Sloping.
- Ballasted.
- With mechanical fastening.
- For metal roofs.
- For corrugated sheet metal roofs.
- For deck-type roofs.
- For concrete roofs.
- For tile roofs or other specific solutions.
The choice shouldn’t be based solely on price. The solar structure must be compatible with the roof and the specific project conditions.
7 criteria for comparing solar roof structures in factories
1. Compatibility with the industrial roof
The first criterion is to determine what type of roof the factory has.
Installing solar panels on a metal sheet roof is not the same as installing them on a deck roof, a concrete roof, or a sandwich panel solution.
Before selecting a structure, it is necessary to analyze:
- Roof type.
- Material.
- Geometry..
- Slope.
- Distance between straps.
- State of conservation.
- Waterproofing system.
- Durable capacity.
- Available fixing points.
In the case of industrial buildings , the photovoltaic structure must be adapted to the actual characteristics of the building, and not the other way around.
Why is it important?
A structure that is technically suitable for one roof may not be suitable for another. A fixing solution that works for corrugated metal sheets, for example, will not necessarily be appropriate for a deck roof.
The compatibility between structure and roof should be the first filter of any comparison.
2. Allowable loads of the roof
One of the most important aspects of photovoltaic structure engineering is verifying that the roof can withstand the additional loads generated by the installation.
The weight of the panels should not be the only consideration.
The calculation should take into account, according to the project:
- Weight of the modules.
- Weight of the structures.
- Weight of auxiliary elements.
- Wind loads.
- Snow loads.
- Maintenance actions.
- Load distribution.
- Local effects on the roof.
- Possible additional loads derived from the fixing system or ballast.
In ballasted systems, the added weight can be considerable, and the load-bearing capacity of the deck must be specifically checked. Learn more about allowable loads.
What should an engineering firm request?
Before comparing solutions, it is advisable to have the following:
- Structural documentation of the ship.
- Roof features.
- Plans and construction details.
- Project location.
- Applicable wind and snow data.
- Information on permissible loads.
The final solution must be supported by the corresponding structural calculation.
3. Fixing system
Fixing is another essential criterion when comparing solar structures.
There are different systems depending on the type of roof:
- Direct attachment to the load-bearing structure.
- Fastening on straps.
- Fixing using specific screws.
- Sheet metal joining systems.
- Ballasted systems.
- Specific solutions for deck roofs.
The decision must consider both the mechanical strength and the waterproofing of the roof.
What should be evaluated?
A technical comparison should analyze:
| Criterion | What to check |
|---|---|
| Endurance | Union capacity in the face of project actions |
| Waterproofing | Risk of leaks |
| Compatibility | Suitability to the roofing material |
| Mounting | Installation time and complexity |
| Maintenance | Accessibility and ease of replacement |
| Durability | Behavior of materials and joints |
A good solution isn’t necessarily the one with the fewest fixings, but rather the one that offers a suitable balance between strength, safety, waterproofing, and ease of installation. Discover more about solar structures.
4. Corrosion resistance
Factories and industrial buildings can be subjected to particularly demanding environments.
Humidity, pollution, proximity to the sea or certain industrial processes can increase the risk of corrosion.
Therefore, when comparing solar roof structures , special attention must be paid to:
- Materials used.
- Anti-corrosive coating.
- Exhibition class.
- Compatibility between metals.
- Screws.
- Unions.
- Cuts made during assembly.
- Expected useful life.
In industrial projects it is advisable to analyze the complete solution and not just the main material of the profiles.
Magnelis and solar structures
Advanced metallic coatings, such as Magnelis® , can be used in certain applications to improve protection against corrosion.
In any case, the choice of material must respond to the specific conditions of the project and the technical specifications of the manufacturer.
5. Compatibility with photovoltaic modules
A solar structure must be compatible with the modules that will be installed.
Before selecting the system, you must check:
- Panel dimensions.
- Frame thickness.
- Fixing system.
- Position of the tightening zones.
- Module configuration.
- Orientation.
- Row spacing.
- Staple and accessory compatibility.
This point becomes especially relevant when the project uses large-format modules.
Not all solar structures are automatically compatible with any photovoltaic module.
6. Ease and speed of installation
In industrial projects, assembly time is also an economic criterion.
A structure that simplifies assembly can reduce:
- Labor hours.
- Roof occupancy time.
- Auxiliary means.
- Logistics costs.
- Risks during assembly.
When comparing solutions, it is interesting to analyze the number of components, the amount of screws and the need for special tools.
It is also important to assess how the components are transported to the roof and how the installation is organized.
7. Maintenance and useful life
An industrial photovoltaic installation is designed to operate for decades.
Therefore, the comparison between solar structures should not end with the assembly.
Considerations:
- Corrosion resistance.
- Accessibility of the joints.
- Possibility of component replacement.
- Inspection of fixings.
- Compatibility with maintenance operations.
- Integration with technical walkways and security systems.
- Availability of spare parts.
The structure is part of the permanent infrastructure of the photovoltaic installation and must be analyzed from a life cycle perspective.
Comparison of solar structures for factories
A practical way to compare different solutions is to use an evaluation matrix:
| Criterion | Solution A | Solution B | Solution C |
|---|---|---|---|
| Roof compatibility | ★★★★★ | ★★★★ | ★★★ |
| Structural capacity | ★★★★★ | ★★★★ | ★★★★ |
| Fastening system | ★★★★★ | ★★★★ | ★★★ |
| Corrosion resistance | ★★★★★ | ★★★★ | ★★★ |
| Ease of assembly | ★★★★ | ★★★★★ | ★★★ |
| Maintenance | ★★★★★ | ★★★★ | ★★★★ |
| Adaptation to modules | ★★★★★ | ★★★★ | ★★★★ |
| Overall cost | ★★★★ | ★★★★★ | ★★★★ |
The specific valuation will depend on the characteristics of each project.
The goal should not be to find the cheapest structure, but the most technically suitable solution for the roof and the installation conditions.
Which solar structure should be chosen for a factory?
There is no single solar structure that is valid for all factories.
The choice depends primarily on:
Roof type + permissible loads + fixing system + environmental conditions + modules + photovoltaic configuration + assembly and maintenance requirements.
For example:
- Metal roofs: usually require solutions specifically designed for this type of support.
- Deck roofs: may require ballasted solutions or fixing systems compatible with the roof composition.
- Concrete roofs: allow for the evaluation of different fixing or ballast alternatives depending on the design.
- Roofs with little additional capacity: require special attention to the weight of the structure and modules.
- Corrosive environments: materials and coatings appropriate to the exposure should be prioritized.
Metal roof.
How to make a technical comparison before buying a solar structure
For engineers and project managers, we recommend using this process:
Step 1. Identify the roof
Determine exactly the composition and geometry of the roof.
Step 2. Analyze the load-bearing structure
Check straps, beams, slabs and load-bearing elements.
Step 3. Define the calculation actions
Consider self-weight, wind, snow, and other actions applicable to the project. Learn more about wind load calculations.
Step 4. Select the fastening system
Choose the method compatible with the roof and waterproofing.
Step 5. Compare materials
Analyze corrosion protection, metal compatibility, and durability.
Step 6. Check compatibility with the modules
Check dimensions, tightening zones and accessories.
Step 7. Analyze assembly and maintenance
Evaluate timing, components, accessibility, and future needs.
Step 8. Compare the total cost
The purchase price should not be the only indicator.
It is advisable to analyze the total installation and life cycle costs .
Common mistakes when choosing solar structures for factories
Among the most common mistakes we find:
Choose based solely on price.
A more economical structure may generate additional installation, adaptation, or maintenance costs.
Do not check the roof
The solution must be designed based on the actual characteristics of the building.
Consider only the weight of the panels
Wind, snow, and maintenance loads must also be incorporated into the structural analysis.
Do not analyze corrosion
The industrial environment may require specific protection solutions.
Do not check the fastening
The connection between the photovoltaic structure and the roof is a critical point of the project.
Not thinking about maintenance
The structure must allow for inspection and maintenance of the installation throughout its useful life.
CAREX technical walkways for access to photovoltaic installation.
Checklist for comparing solar roof structures
Before making a decision, an engineering or EPC company can use this checklist:
Deck
- Type of roof identified.
- Condition verified.
- Waterproofing system analyzed.
- Heavy-duty capacity available.
Structure
- Calculated self-weight.
- Wind actions considered.
- Snow actions considered.
- Maintenance costs considered.
- Structural calculations available.
Fixation
- System compatible with the roof.
- Strength of the joints tested.
- Protected waterproofing.
- Correctly sized components.
Materials
- Corrosion protection.
- Material compatibility.
- Suitable screws.
- Expected useful life.
Facility
- Estimated assembly time.
- Logistics defined.
- Deck accessibility.
- Auxiliary means provided.
Maintenance
- Access to components.
- Inspection of fixings.
- Possibility of replacement.
- Integration with security systems.
Quick Response
How to compare solar roof structures for factories?
To compare solar roof structures in factories, seven main criteria must be analyzed: compatibility with the roof, allowable loads, fixing system, corrosion resistance, compatibility with photovoltaic modules, ease of installation and maintenance .
The right solution is not necessarily the cheapest, but the one that offers the best combination of structural safety, compatibility with the roof, durability, ease of assembly and total cost over the installation’s lifespan.
What should be checked before installing solar panels on a factory?
Before installing solar panels on an industrial building, it is necessary to check the load-bearing capacity of the roof and the building structure, the wind and snow loads, the weight of modules and structures, the fixing system, the waterproofing and the environmental exposure conditions.
Which solar structure is best for an industrial roof?
There is no single best structure. The solution must be selected based on the roof type, structural capacity, fixing system, environmental conditions, modules used, and photovoltaic installation configuration.
Is corrosion resistance important?
Yes. Corrosion protection is especially important in industrial facilities and in areas with humid, polluted, or marine environments. Profiles, coatings, fasteners, and connections must be analyzed.
Is it necessary to perform a structural calculation?
Yes. The installation must be structurally checked to verify that the roof and its load-bearing elements can withstand the additional loads from the photovoltaic system and the corresponding environmental loads.
Alusín solar and solar roof structures for factories
Comparing solar roof structures for factories requires much more than comparing prices or catalog features.
A professional assessment should start with the roof and continue with the allowable loads, the fixing system, corrosion resistance, compatibility with the modules, assembly and maintenance .
For solar engineering firms, EPCs, and industrial project managers, this approach allows for the selection of a photovoltaic solution that is safer, more durable, and adapted to the actual conditions of each building.
Ultimately, the best solar structure is one that is correctly sized for the roof, the loads and the environmental conditions of the project, and that also offers an efficient solution throughout its useful life.
At Alusín Solar, we can help you with your project and provide technical advice tailored to your needs: Request a technical consultation
Frequently asked questions about solar roof structures
What are solar roof structures?
These systems are designed to support and fix photovoltaic modules on industrial, commercial and other building roofs, transmitting the loads of the installation to the resistant structure of the building.
What factors influence the choice of a solar structure?
The main factors are the type of roof, load-bearing capacity, wind and snow loads, fixing system, installation weight, environmental conditions, corrosion, modules used, and maintenance requirements.
What is more important: the price or the quality of the structure?
Price should be considered alongside safety, durability, ease of installation, and maintenance. For industrial projects, it’s more appropriate to compare the total cost of the solution rather than just the purchase price.
Are solar structures suitable for any type of roof?
No. Structures must be selected specifically according to the composition, geometry, load-bearing capacity, and waterproofing system of each roof.
What role does photovoltaic structural engineering play?
Engineering allows for the determination of design loads, the dimensioning of components, and the verification of the load-bearing capacity of joints and the roof to ensure a solution suitable to the project conditions.
How to choose solar structures for industrial building roofs?
First, the roof type and load-bearing capacity must be identified. Then, the loads, fastening system, corrosion resistance, compatibility with the modules, assembly, and maintenance must be analyzed before comparing the different alternatives.
