Thailand 84.36 kW L-Foot Roof Mounting Case Study
This rooftop PV project uses 228 landscape modules, aluminum rails and mechanically fixed roof attachments. The layout is divided into shorter module groups so the array can follow the available roof zones and maintain clearance around roof obstacles.
Key documented values
The figures below are taken from the project information shown on this case page. They describe this installation only and are not universal design values for other roofs.
Shorter array groups follow the available roof zones
The documented layout uses several table lengths instead of one continuous module row. This allows the PV field to fit around roof edges, penetrations and changes in usable roof area.
Project roof overview with different row lengths and clear areas around obstacles.
Documented module groups
Mechanical roof fittings connect the rail system to the building
The mounting schedule identifies L-foot roof fittings used with horizontal aluminum rails. The project is therefore presented as a mechanically fixed system rather than a seam-only clamp installation.
Close view of the roof fitting and its connection to the metal roof.
What the project record shows
- Attachment: mechanically fixed roof fitting / L-foot
- Rails: AL6005-T5 aluminum
- Module restraint: end clamps and inner clamps
- Hardware: aluminum and SUS304 where documented
- Layout logic: attachment positions coordinated with the roof support layout
- Project limitation: fixing and sealing details must be checked for the actual roof and structure on any new job
Rail lengths vary with the module group
The project drawing assigns different rail lengths to the 1 × 1 through 1 × 7 groups. That keeps each table matched to its roof zone instead of treating one rail length as a universal value.
Rail lengths shown in the project drawing
| Module group | Rail length shown |
|---|---|
| 1 × 1 | 1300 mm |
| 1 × 2 | 2300 mm |
| 1 × 3 | 3400 mm |
| 1 × 4 | 4400 mm |
| 1 × 5 | 5500 mm |
| 1 × 7 | 7600 mm (4500 + 3100) |
These dimensions are project records, not standard cut lengths for other roofs.
Installed rail and module-clamp detail from the project.
Roof connection details need project-specific verification
Completed attachment detail showing fastener placement and the finished roof interface.
For a new roof, confirm the actual design inputs
A new mounting layout should be checked against the roof profile, supporting structure, fastener specification, module geometry, local wind and snow requirements, and the required sealing method.
Three practical takeaways from the layout
Roof geometry drives table size
Using several module-group lengths helps fit the array into fragmented roof areas without forcing one long table through every zone.
Attachment points are part of the load path
The rails transfer module loads through the roof fittings into the building, so the attachment layout and supporting structure must be coordinated.
The BOM follows the approved layout
Rail lengths, roof fittings and clamp quantities change with the table arrangement. A project drawing is more useful than estimating components from system capacity alone.
Reference values and scope
- LocationThailand
- Capacity84.36 kW
- Modules228 × 370 W
- Module size1750 × 1038 × 35 mm
- OrientationLandscape
- Array groups1 × 1, 1 × 2, 1 × 3, 1 × 4, 1 × 5 and 1 × 7
- Roof interfaceMechanically fixed L-foot type fitting
- Rail materialAL6005-T5
- Wind input29 m/s in the supplied project information
What this page does not claim
This case study does not present a universal fastener spacing, allowable load, waterproofing guarantee, roof compatibility statement, or reusable engineering approval.
Those items depend on the selected attachment, the actual roof and supporting structure, the module layout, and the design requirements for the new site.
Planning a similar rooftop PV layout?
Share the module datasheet, roof profile, roof dimensions, support spacing, site design loads and proposed array plan. Those inputs can be used to review the roof attachment, rail layout, clamps and project BOM.