Rivets for Metal
When joining metal components, choosing the correct rivet is an integral part of ensuring a secure and long-lasting connection.
Rivets for metal are available in different forms, with various material and size options. The best choice depends on the specific aspects of the application, such as type of metal, thickness of the material, as well as environmental factors.
Using incompatible metals in a project may result in galvanic corrosion, damaging the rivet, the roofing material, or both.
Why use metal rivets with metal roofing?
When a steel or steel-coated rivet is used for specific projects, using a compatible metal rivet ensures that the rivet and the roofing material work together.
A compatible rivet can provide the following:
- A secure mechanical connection
- Appropriate strength
- Better material compatibility
- Suitable corrosion performance
- Consistent long-term performance
- A professional finished appearance
What is galvanic corrosion?
Galvanic corrosion may occur when two incompatible metals are in contact with each other, in the presence of moisture. This typically happens from rain, and evening dew, and more serious in the presence of marine and industrial areas, where the galvanic corrosion is more severe. When choosing a rivet, it is important to consider the combination of the rivet with the roofing material, to reduce the risk of galvanic corrosion and possible premature failure of the project.
Rivets for galvanised roofing
Galvanised roofing consists of steel sheets to which a zinc coating has been applied, that have subsequently been profiled through rollers. This establishes the shape and overlap of single sheets that combine to form the final roof.
A zinc coating protects the steel. To be effective, this coating must also be protected from mechanical damage, especially during transport and installation. When choosing rivets for galvanised roofing, the rivet choice must be compatible with the galvanised surface.
Rivets for painted metal roofing
Painted metal roofing necessitates more considerations, as there is both a metal substrate and a layer of protective coating.
When installing rivets on a painted roof, care must be taken to avoid damaging the coating of the roof. A rivet which is compatible with the material of the roof and the coating should be chosen. This will ensure a trouble-free life of the roofing.
Rivets for Chromadek roofing
Chromadek is a popular South African colour-coated steel roofing product.
This product combines a steel core with a metallic zinc coating, followed by a colour coating. This coating is applied in the steel coil manufacturers plant, providing a smooth finish that is coded across steel coil, to ensure colour consistency of the end roofing project. The layer of colour provides a nice finish, while the zinc layer offers protection to the underlying steel.
Due to the specific coating system of Chromadek, the choice of rivet matters.
When selecting rivets for Chromadek roofing, it is important that the rivets and the roofing material are compatible.
Consider the following when using rivets with Chromadek:
- Use the correct rivet material.
- Select the correct diameter and grip range.
- Avoid unnecessary damage to the painted coating.
- Remove drilling swarf and metal debris.
- Check the manufacturer's fastening requirements.
- Pay particular attention to coastal and industrial environments.