The quality of the metal panels and coatings is directly tied to the manufacturer, and reputable contractors often hold Manufacturer Certifications or factory accreditations (e.g., from brands like GAF, Owens Corning, or specific metal panel suppliers). These certifications signify that the contractor has undergone specialized training directly from the product manufacturer and is aut... https://kkroofspecialist.com.sg/metal-roof-contractor/