The proper maintenance plan for metal roofing includes regular inspections of the panels and fasteners to look for distress conditions, which can include: movement distress of the panels and fasteners, sealant failures, fastener gaskets, snow, ice, and hail damage, failures of surface coatings, debris clogging drains and gutters, and debris clogging drains and gutters. According to the manufacturer, fastener gaskets should be replaced when they have reached the end of their expected service l...