Is it worth ordering from manufacturers the exact calculated length of metal siding or with a margin of a few cm. with subsequent trimming on the spot?
The house is fairly flat, new (2 years), SIP technology with chamber drying beams.
The whole point of ordering "to size" – to simplify installation by eliminating the trimming of standard panels. Will remain only the adjacency to the slopes. Plus the factory panel cut off the panel guillotine, and this edge will last much longer without corrosion than the cut with a grinder. Scheme for measuring panels: you put the corners, connectors, trim. Put a tape measure into the cavity of the connecting strip and measure the distance to the outer edge of the angle. Accordingly, when installing first bring the edge of the panel inside, and then move back half of the "reserve".