Patina Formation

Metals and metal alloys used for the fabrication of architectural roof panels and accessories are often those that are naturally weathering and whose surfaces develop a layer of protection upon exposure to the elements. Aluminium, copper, lead, stainless steel, and zinc are all naturally weathering.

A naturally weathering metal forms its own protective layer by oxidation, sufficient to withstand environmental exposures and to develop oxidation layers that are durable and well-bonded to the base metal, with minimum porosity and minimum solubility in water. This weathering and subsequent oxidation can result in a different colour and appearance as well as protecting the metal.