Outperforms and outlasts ordinary galvanised steels, painted or unpainted

Age: 17 years
Slope: 20 degrees
Environment: Rural
Location: Vecoux, France

The post-painted (field painted) hot-dip galvanised roof section is in poor condition, and even perforated at a few points. The 55% Al-Zn section, though dirty, is in good condition - apart from localised corrosion due to pollution from the roof stack.

Age: 23 years
Slope: < 5 degrees
Environment: Urban
Location: Bremen, Germany

The performance of 55% Al-Zn on the 23-year-old roof contrasts sharply with the deterioration of the roof vent in hot-dip galvanised steel.

Age: 18 years
Slope: 22 degrees
Environment: Rural
Location: Aspatria, UK

The 18-year-old 55% Al-Zn roof on the right (rural environment, UK) contrasts with galvanised panels at the same location, beginning to rust after only 6 years.

Age: 20 years
Slope: 5 degrees
Environment: Urban/light marine
Location: Tyresö, Sweden

The galvanised fastener on this 20 year old panel in an urban environment has rusted, and the 55% Al-Zn material is starting to sacrifice itself to protect the fastener.