In Poland, a roofer's quality is shown above all by how they think, not by the price per square metre alone. Check whether they can explain how the roof will be built, know the instructions for the chosen system and recognise problems that need a structural engineer. When discussing a team, ask about projects using a material similar to the one planned, because installing modular metal tiles differs from laying long trapezoidal sheets. Request a discussion of details and documentation of the stages that will later be covered. Experience matters, but it must relate to comparable work.

The key to a successful installation of modular metal roofing tiles is to establish the batten spacing precisely from the instructions for the specific model, not from dimensions carried over from another profile. Before laying the sheets, check the geometry and condition of the substrate and plan the eaves details and water drainage. Also confirm that the covering suits the roof pitch. Differences in the pressing can prevent the module from being supported correctly, so verify the dimensions and fixing sequence for the chosen product before starting permanent fixing.

A small module is easier to carry and to fit to a complex roof slope. A long sheet can efficiently cover a simple area. Neither solution wins on every building, however. You need to compare the cutting layout, delivery conditions and the requirements of the chosen profile. It also matters how a damaged section will be replaced later. A module has a fixed length and coverage width. Repeated elements form successive rows. Made-to-measure sheets are ordered in selected lengths, within the limits of the given technology. In both solutions, side joints remain. Long strips can reduce the number of transverse laps on a simple roof slope.