Before comparing sheets, establish whether the metallic protection is meant to be visible or hidden beneath an organic coating — this affects how the product should be assessed. In a typical roof sheet, the zinc, aluminium and magnesium layer sits on the steel core, under successive finishing layers, though it may also form an uncoated surface. Check the exact coating designation, how its quantity is stated, and whether the data refer to one side or both combined. On a metal-tile sample you usually see the outer layer, not the steel's metallic protection itself.

A metal roof tile coating is not a single layer of paint but a system of metallic protection and organic layers that shields the steel and gives the covering its colour. When choosing, check whether the declared properties match the building's actual surroundings, including moisture, salt and pollution. Corrosion resistance, sunlight resistance, damage resistance and the scope of the warranty are key. Gloss or colour alone does not determine protection, so compare the data sheet of the specific product rather than an entire material family.

Choosing a metal roof tile for a traditional or mountain-style house starts with matching its profile and colour to the building's form, the timber, stone and wide eaves. Study the rhythm of the pressings on a sample positioned at an angle similar to the roof pitch, since a piece held upright in a shop casts different shadows from the finished covering. Leave the final choice of structure and fixings to the designer, who will account for local snow load and wind.