One of the most common challenges in roof-mounted solar power plant (Rooftop SPP) projects is the uncertainty about how the mounting structure should be fixed to the roof.

Solar system owners naturally want to protect the roof’s waterproofing, so they prefer not to drill or damage the surface.

Although there are several installation methods, this page focuses on explaining the screw-mounted and riveted systems, along with their visual examples.

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Riveted System

As shown in the illustrations, the riveted system secures the roof sheet by pressing it from both the top and bottom.
The lower clamp provides at least 6–7 mm of grip, depending on the type of rivet used,
while the upper side forms a cap of more than 15 mm.

To remove a rivet, the roof sheet would need to be torn by at least 7–8 mm, showing how firmly it holds.

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Screw-Mounted System

In this system, the screws grip the sheet only as deep as the thread depth allows.
Considering that typical roof sheet thicknesses are between 0.5 mm and 1 mm (most commonly 0.5–0.7 mm),
and the thread spacing is around 1 mm, the roof sheet essentially remains between the screw grooves.

The pulling strength of the screw that holds the aluminum structure to the roof sheet
depends entirely on the tear resistance of that 1 mm metal sheet.

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In Summary

• Riveted systems are at least three times stronger and three times more durable than screw-mounted systems.

• In static calculations, this difference can be even greater.

• For waterproofing, the riveted system is clearly superior.
  It provides sealing both from above and below, meaning that even without rubber gaskets, seals, or sealing compounds,
  the system can still maintain full waterproof integrity — ensuring long-term protection and structural reliability.