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GalFan ZGF 255 expected design life 50yrs to 150yrs

The estimated time to first maintenance for a hot-dip galvanized coating that experiences common atmospheric exposure can be seen below. Time to first maintenance is defined as the time to 5% rusting of the substrate steel. The time to first maintenance of hot-dip galvanized steel is directly proportional to the zinc coating thickness. Source American Galvanisers Association

Zinc Galvanised corrosion resistance

1.5mil = 255grams/m2 = ZGF255 spec

GalFan (95% zinc, 5% aluminium) has proven to be 2 to 3 times more corrosive resistant than the same thickness of Hot Dip 100% zinc Galvanising. Depending on the environment, it may take 50yrs to 150yrs for 5% rust to show on the surface of GalFan ZGF 255 spec, when above ground.

BS EN 10244-2:2009 Zinc and zinc/aluminium-alloy coatings on steel wire. Class A Heavy Coating

When constructing gabion retaining walls in strongly acidic soils (PH over 5.5), the soil and the corrosive groundwater must be separated from the gabion structure by using geotextile fabrics and a properly designed drainage system.

Good drainage behind and below your gabion retaining wall will not only improve the retaining walls stability, it will also increase the expected design life of the gabion wall

Below is a link to link to a 15 year long study on factors that effect the life span of gabions

State of California Gabion mesh corrosion report


In the United Kingdom there are areas where local conditions create an increased likelihood of corrosion. Special consideration should be given to material selection and design in these areas. They include:

1. Coastal Environment

Within 1000m of the coast, characterised by:
Light salt deposits
A frequent smell of salt in the air
In the immediate vicinity of large expanses of calm salt water such as harbour foreshores
This environment may be extended inland by prevailing winds and local conditions.

2. Industrial Environments

Within 500m of corrosive industrial emissions and subject to heavy fallout from them.

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