Most time during the installation of a sandwich roof panel can be saved by checking the supporting structure before the panels are delivered. The panel combines covering and insulation, which reduces the number of separate operations but does not remove the need for careful sealing. It is worth verifying the spacing and width of supports, their position at the eaves, ridge and openings, and the actual roof pitch. A measurement error cannot be corrected by pulling the joint tighter, so accepting the structure before unloading can be decisive.

A weathertight roof is created from well-selected panels, suitable supports and carefully executed joints. Simply screwing down successive elements is only part of the task. Before installation, the laying direction, the lifting method and the water drainage details must be established. The sequence below organises the work, but the joint dimensions depend on the specific system. Verify the axes, the plane and the support widths, as well as the conformity of the structure with the design. Crooked purlins can cause poor bearing and stress on the panels. The structure should not be straightened by over-tightening the cladding with screws. Before starting the cladding, also confirm the stability of the frame and the completion of works that could damage the coatings.

Work out the laying sequence before ordering sandwich roof panels. It affects which ends need to be cut back, which flashings to order and when the roofers can start. For each panel group, the schedule should identify the core and surface finish as well as the panel dimensions, including thickness. Check that the drawings locate the end laps, rooflights and service penetrations. Confirm the laying direction and which sheet overlaps its neighbour before the panels go into production. An omission at that stage can mean rework and delays on site.