The quality of a metal roofing tile depends on its steel core, corrosion protection, coating and the precision of its pressings. Check the nominal steel thickness, the material and the product documentation, bearing in mind that a measurement of the coating is not the same as the core thickness. Match the sheet's properties to the conditions on your plot. Remember transport, storage and installation too, because an attractive pattern cannot replace damaged protection.

Tile-effect metal roofing is a thin metal covering with a formed profile. In the steel version, its durability relies on the interaction of the core, metallic protection and coatings. Each layer has a different task. The profiling helps give the sheet its shape and rigidity, but does not replace insulation, an underlay or a correctly designed structure. Beneath the outer coating is a thin steel core protected metallically, for example with a zinc layer. There are also surface preparation layers and a primer. On the underside, protection suited to the intended use is applied. The exact build-up depends on the product and should not be guessed from the colour alone.

A metal roof tile owes its durability and appearance to the full coating system, not the outer paint alone. Colour and texture are only the finish: beneath them sit the steel core, metallic protection and layers that prepare the substrate and form the organic coating. Each has its own job, so judging a product by gloss or micrometre count can mislead. What matters is the type of protection, resistance to corrosion and sunlight, service conditions, and the complete material the profile was made from. Installation and maintenance also shape durability.