When specifying fasteners for solar photovoltaic (PV) projects, engineers often focus on load capacity, installation efficiency, and corrosion resistance. However, in certain locations, standard engineering assumptions can lead to costly failures.

Réunion Island, a French overseas territory located in the Indian Ocean, is one of those locations.

A local engineering contractor responsible for one of the island's largest solar PV projects faced an urgent challenge after its long-term French fastener supplier suddenly failed to deliver. With construction halted and significant delay penalties accumulating daily, the project team issued a strict requirement:

Provide a technically qualified quotation and complete documentation within 48 hours.

As a China roofing screw manufacturer specializing in solar and roofing fastening systems, TSR was asked to provide a solution within 48 hours.

Project Overview

About TSR

TSR Screw is a China self drilling screw factory focused on roofing, cladding, solar and steel construction applications.

Our products include:

• Roofing Screws

• Self Drilling Screws

• Bi-metal Screws

• Solar Fasteners

FAQ: Why Is Réunion Island Such a Difficult Environment for Fasteners?

Three major factors combine to create one of the harshest construction environments in the world:

1. Marine Salt Exposure

The project site is located near the coastline and is continuously exposed to salt-laden air.

Salt particles accelerate corrosion and can rapidly attack insufficiently protected carbon steel fasteners.

2. Extreme UV Radiation

The local UV Index frequently reaches 13–14.

At this level, many conventional coatings, paints, and polymer-based protective layers begin to degrade, crack, or powder over time.

3. Tropical Storms and Heavy Rainfall

Frequent storms expose fasteners to:

• Constant moisture

• Rainwater washing

• Temperature cycling

• Mechanical vibration

These conditions significantly increase corrosion risk and shorten service life.

4.Why choose a China roofing screw manufacturer for coastal solar projects?

A specialized China roofing screw manufacturer can provide customized coating systems, flexible production and direct engineering support.

Why Was the Initial Solution Rejected?

Based on standard outdoor project experience, a mechanical galvanized C3 corrosion protection system was initially considered.

However, after reviewing the actual site conditions, the engineering team determined that a C3 system would not provide adequate protection.

Potential Risks of Using C3 Coating

• Coating degradation under extreme UV exposure

• Accelerated corrosion from marine salt

• Surface cracking and peeling

• Premature rust formation

• Reduced maintenance cycle

For a solar project targeting a 25-year service life, these risks were unacceptable.

TSR's Technical Solution

After reassessing the environmental conditions, as a 10+ self drilling screw manufacturer serving roofing and solar industries, TSR proposed a Ruspert-coated fastening solution..

Key Performance Characteristics

Unlike conventional organic coatings, the Ruspert multi-layer ceramic structure offers superior resistance to UV degradation and marine corrosion.

Beyond Fasteners: Solving the Real Problem

The client's biggest concern was not simply corrosion resistance.

The real challenge was time.

The project had already stopped due to supply chain disruption, and delay penalties were increasing daily.

Step 1: Fast Documentation Support

Within 48 hours, TSR delivered:

• Commercial quotation

• Technical specifications

• Salt spray test reports

• Corrosion resistance documentation

• English-language technical files

This allowed the client's engineering team to complete technical approval immediately.

Step 2: Practical Logistics Strategy

After reviewing inventory and production schedules, TSR identified a challenge:

The required 316L stainless steel products were not available in stock and required a new production run.

Instead of providing an unrealistic promise, TSR proposed a practical solution.

Recommended Strategy

1. Purchase a small quantity of equivalent fasteners locally to restart construction immediately.

2. Begin full-scale production at TSR simultaneously.

3. Deliver the main order after production completion.

This approach helped the client reduce financial losses while maintaining technical compliance.

Results and Client Feedback

Twenty days after installation began, the client provided positive feedback.

Compared with the fasteners supplied by their previous European supplier, the TSR products demonstrated:

• Lower defect rates

• More consistent coating quality

• Better installation performance

• Higher overall satisfaction

Most importantly, the project was able to resume construction and avoid further delay penalties.

Comparison: Standard Solution vs TSR Solution

Lessons for Solar and Coastal Construction Projects

1. Environment Must Drive Specification

Never specify fasteners solely based on general outdoor classifications.

Always evaluate:

• Distance from coastline

• Salt exposure

• UV intensity

• Rainfall

• Wind conditions

before selecting the corrosion protection system.

2. Documentation Can Be as Important as the Product

For engineering projects, approval speed often depends on the quality of technical documentation.

Fast access to reports and certifications can significantly reduce project delays.

3. How To Choose A Roofing Screw Manufacturer For Coastal Projects

When evaluating a roofing screw manufacturer, buyers should consider:

1. Salt spray test reports

2. UV resistance

3. Traceability

4. Production capacity

5. Engineering support

Conclusion

The Réunion Island solar project demonstrates that successful fastening solutions require more than selecting a product from a catalog.

By understanding the environmental challenges, adapting the corrosion protection strategy, and providing rapid technical support, TSR helped a client overcome supply chain disruption and restart a critical renewable energy project.

For coastal solar projects, roofing systems, and high-corrosion environments, proper fastener selection remains one of the most important decisions affecting long-term project performance.

Need Help Selecting Fasteners for Coastal or Solar Projects?

Contact the TSR technical team for:

• Corrosion protection recommendations

• Material selection support

• Salt spray test reports

• Roofing and solar fastening solutions