A metal-roof-contractor is also an expert in underlayment technology. The layer between the metal and the wood deck is the last line of defense against moisture. Professionals use high-temperature synthetic underlayments that won't stick to the metal or degrade under extreme heat. This material provides an extra layer of waterproofing and helps with sound dampening during heavy rain. ... https://kkroofspecialist.com.sg/metal-roof-contractor/