Corrosion Resistance and Corrosion Protection in Flat Roofing Systems

Fundamentally, the regulations distinguish between corrosion-resistant and corrosion-protected. But what is the difference exactly?

What Is Corrosion Resistance in Flat Roof Fasteners?

Corrosion resistance is a specified term in DIN EN ISO 8044. It describes the ability of a material to fulfil its function in a given corrosion system, without drawbacks due to corrosion. If a specifier, a standard or a regulation requires that a component should be "corrosion-resistant", this means that the material this component is made from, does not suffer from corrosion damage under the given boundary conditions. Then it is not permitted to use a material with coatings or finishings. Stainless steels are specified at the national level in Germany in the Z-30.3.6 dated 5th March 2018 and are summarised in an overview.

What Is Corrosion Protection in Roofing Applications?

Corrosion protection is a term not specified in standards. It describes how components are protected from environmental conditions with the help of coatings and finishings. For applications on flat roofs, the minimum requirement for corrosion protection is specified in the ETAG 006 or in EAD-030351-00-402-2029 and is defined by the Kesternich test as per DIN 50018.