A high-quality aluminum roofing material Singapore installation minimizes the need for exposed fasteners. Where fasteners are necessary, professional contractors use specialized washers and sealants to prevent moisture intrusion and ensure that the fasteners themselves are made of compatible, non-corrosive materials (like stainless steel) to avoid galvanic corrosion with the aluminum ... https://kkroofspecialist.com.sg/aluminum-roofing-material-singapore/