Fastener selection is a technical detail that a metal-roof-contractor handles with care. Using the wrong type of screw can lead to galvanic corrosion, where two different metals react and eat away at each other. Professionals use high-grade stainless steel or zinc-plated fasteners with EPDM washers that create a permanent seal. These components are designed to survive the same fifty-y... https://kkroofspecialist.com.sg/metal-roof-contractor/