On the picture below you may see the roof paneling installation procedure and the distances between supports are shown also. Before installation of the roof coverage it is necessary to make sure that rafters or the top belts of the roof trusses are mounted in parallel, direct straight and precisely. Curve either irregular rafters or top belts of trusses damage the look of a ready roof. Panels should be mounted with the flock side upwards and the long side across rafters or belts of trusses. Edges along the long side of panels should be propped up with support or should be connected with edge clamps according to instructions. The clearance of 3mm should be kept near all the edges of the panel to allow linear expansion of dump. Panels should be sheeted with shifts, at least, of two bays, and face joints should lay on supports. Security measures: As the roof covering can be slippery with the dump, hoarfrost, snow or sawdust, assemblers should carry footwear on a rubber sole, use the appropriate safety equipment and to be extremely cautious on square roofs.