Also see:
2.18.2.1.5 Fixing
Solar PV technologies shall be fixed using durable materials.
Fixings should comply with the types listed in Table 2.
Table 2: Materials suitable for fixings
| Fixing material | Guidance |
|---|---|
| Phosphor bronze | NA |
| Silicon bronze | NA |
| Stainless steel | BS EN ISO 3506 |
| Mild steel | Coatings to BS EN ISO 2081, BS EN ISO 2082, BS EN 1461, or other appropriate treatment in accordance with BS EN ISO 12944 or BS EN ISO 14713 |
| Aluminium alloy | BS EN 573 and BS EN 755 |
| Stainless steel | BS EN 10088 |
| Mild steel | BS EN 10346 |
| Other materials | Assessed in accordance with Technical Requirement R3 |
Materials that comply with recognised standards, which provide equal or better performance to those above, are also acceptable.
The type, size, number, position and fitting tolerance of fixings should be in accordance with the manufacturer’s recommendations.
Issues that should be taken into account include:
- the provision of suitable locking nuts and washers
- the isolation of dissimilar metals
- the isolation of aluminium from cementitious material.
All components including integrated roof trays, panels, flashings, electrical connectors and wiring that penetrate the roof structure to the space below should be appropriately flashed and comply with the requirements of R3.
Last updated: 2nd January 2024