Concealed-fastener panels roll-formed to length on site, so there are no lap seams across the slope to work loose. Finishes carry a forty-year paint warranty and shed snow cleanly.
Exposed-fastener metal relies on hundreds of rubber washers, and every one of them is a leak with a countdown on it. Standing seam hides the fasteners inside the seam instead, so nothing that holds the roof down is exposed to weather or UV. Rolling the panels on your driveway means each one runs from eave to ridge in a single piece, with no lap seam across the slope to work loose over a decade of thermal movement.
