First check whether the roofer has experience with roofs of similar geometry and covering, not just simple slopes. When choosing a contractor, compare full scopes of work, establish responsibility for measurements and purchases, and agree how concealed layers will be documented. Ask about safety organisation and acceptance stages. Remember that material quality is not the same as workmanship quality, and an offer made without assessing the structure's condition may cover only basic covering.

When choosing a lightweight roof covering, compare above all the format of the elements and the number of joints, as these determine how well the covering fits the roof. Check whether modular metal roof tiles suit your roof slope, details and installation method, not just the overall appearance. It is worth comparing the cutting layout, the time needed to make joints and the full cost with cut sheets and trapezoidal profiles. Remember that overall dimensions differ from the effective covering area, and individual models may have a different geometry.