Fastening techniques are a core competency of any expert metal-roof-contractor in the field. Using the wrong type of screw or overtightening the washers can lead to leaks and unsightly rust spots. Professionals use high-grade stainless steel or carbon steel fasteners with EPDM washers for a watertight seal. They follow the manufacturer’s specific spacing patterns to ensure maximum win... https://kkroofspecialist.com.sg/metal-roof-contractor/