When installing , the fastening method is critical to ensuring a watertight seal. There are two primary types: exposed fastener systems and concealed fastener systems. Exposed systems use screws with rubber washers, which are cost-effective but require periodic inspection. Concealed systems, such as standing seam, hide the fasteners beneath the metal panels. This latter method is high... https://kkroofspecialist.com.sg/metal-roofing-singapore/