Mounting Systems for Different Roof Types Metal Sheet, Concrete, and Tile Roofs
Contents
As solar energy continues to gain popularity, selecting the right solar mounting system for your rooftop becomes crucial for both system performance and long-term stability. Different roof structures require specific solutions to ensure secure, efficient, and leak-proof solar installations. In this post, we’ll explore the ideal pv mounting systems for three common roof types: metal sheet (corrugated or trapezoidal), concrete flat roofs, and tile roofs.
1. Metal Sheet Roofs (Corrugated or Trapezoidal Panels)
Recommended System: Rail-based or rail-less systems with L-feet or roof clamps
Metal sheet roofs are widely used in industrial and commercial buildings. They are lightweight and easy to work with, but require precise solar panel mounting solutions to avoid water leakage and roof damage.
Mounting Options:
L-foot with Self-tapping Screws: Common for trapezoidal or corrugated metal roofs. The L-foot is fastened directly into the roofing purlin using self-tapping screws, usually with a waterproof EPDM rubber washer.
Roof Clamps: Rail-less or mini-rail systems with specialized clamps can be used to avoid roof penetration.
Standing Seam Clamps: For standing seam roofs, non-penetrating clamps are available, allowing for a completely drill-free installation.
Advantages:
Fast installation
Lightweight and cost-effective
Minimal impact on roof structure
2. Concrete Flat Roofs
Recommended System: Ballasted mounting systems or anchor-fixed systems
Flat concrete roofs are commonly found in residential buildings, especially in Southeast Asia and Southern Europe. These roofs offer flexibility in array layout and orientation.
Mounting Options:
Ballasted Mounts: These systems use concrete blocks or pre-cast ballast to weigh down the structure, avoiding roof penetration. Ideal when roof integrity must remain intact.
Anchor-fixed Systems: When structural anchoring is acceptable, stainless steel expansion bolts can fix the mounting frame directly to the roof.
Adjustable Tilt Legs: These help optimize panel angles for maximum solar gain.
Advantages:
No roof penetration (with ballast)
Good airflow and cooling beneath panels
Easy access for maintenance
3. Tile Roofs (Clay or Glazed Tiles)
Recommended System: Roof hooks with rail systems
Tile roofs are aesthetically pleasing and commonly used in villas and traditional residential homes. However, their fragility means care must be taken during installation.
Mounting Options:
Roof Hooks: Stainless steel or aluminum roof hooks are installed beneath the tiles, attached directly to rafters. Solar rails are then mounted on the hooks.
Customized Hooks: Different tile shapes (Spanish, Roman, flat) may require different hook designs.
Tile Replacement Kits: In some cases, tile replacements with integrated mounting points are used to prevent tile breakage.
Advantages:
Preserves roof appearance
Durable, secure installation
Compatible with different tile types
Conclusion
Choosing the right solar mounting system depends on your roof type, load-bearing capacity, local weather conditions, and installation preferences. Here’s a quick summary:
|
Roof Type |
Recommended System |
Key Feature |
|
Metal Sheet |
L-foot, self-tapping screws, or non-penetrating clamps |
Fast and simple installation |
|
Concrete Flat Roof |
Ballasted or anchor-fixed system |
Flexible layout and tilt options |
|
Tile Roof |
Roof hooks and rails |
Aesthetic and safe tile installation |
Each roof type poses its own challenges, but with the right mounting system, solar energy can be harnessed safely and efficiently for decades to come.