Clear answer
Clear answer, explained.
This adds significant dead load to the roof structure. A structural review assesses deck type, beam spacing, load ratings, and allowable deflection to confirm that the combined weight of the solar system, ballast, snow, and wind loads remains within safe limits. If capacity is insufficient, alternative mounting methods or structural reinforcement may be required.
Key points
What this means in practice.
- Ballasted systems add substantial permanent roof load
- Roof deck, joists, and beams must be structurally verified
- Snow and wind loads are combined with ballast weight in calculations
- Load distribution mats may be used to spread weight
- Some roofs require mechanical attachment instead of ballast
- Structural engineer sign-off is typically required
When this applies
Best-fit environments.
- Large flat-roof warehouses and distribution centres
- Pre-engineered and concrete industrial buildings
- Sites considering non-penetrating ballasted racking systems
- Projects in regions with high snow or wind design loads
Q·01
