An often-overlooked advantage is the ability of a metal-roof-contractor to install metal roofing directly over an existing shingle roof in certain situations, which can save the homeowner significant tear-off and disposal costs. This "roof-over" technique requires a careful assessment by the metal-roof-contractor to ensure the existing roof deck and framing can support the combined we... https://kkroofspecialist.com.sg/metal-roof-contractor/