Coated steel sheet and titanium-zinc are two different materials and should not be compared by colour alone, nor should one be treated as a more expensive version of the other. In coated sheet, steel provides the mechanical properties while successive coating layers give colour and gloss; in titanium-zinc, the core material is a zinc-based alloy on which a natural patina may form. Before deciding, check the chosen system's documentation: layer build-up, fixing requirements, compatibility of materials in contact with the sheet, and detailing at eaves, chimney and ridge.

When buying sandwich panels and trapezoidal steel sheet in Lower Silesia, it is worth assessing the whole purchase, from material matching to unloading. A large yard and extensive advertising do not tell you whether the available lengths suit the building. The most useful quote answers questions about parameters, the actual quantity of material and the delivery method. Prepare a list of walls, roof slopes and openings. Mark the lengths, cover widths and the external side of the panels. Note which rooms will be heated and whether moisture will occur in them. This gives the seller specific requirements, not just a question about the cheapest metre of material.