Fastener selection is a technical detail that a metal-roofing-contractor-singapore handles with care. Standard screws often fail prematurely in high-humidity zones. Professionals use Class 4 or 5 galvanized fasteners that are specifically designed for the corrosive Singaporean air. These screws feature specialized heads that seal the hole as they are driven in, preventing moisture fro... https://kkroofspecialist.com.sg/metal-roofing-contractor-singapore/