Effective drainage design is a specialized skill of a metal roofing contractor singapore. Given the volume of water during a tropical downpour, the gutters and downspouts must be sized correctly to prevent overflow. Contractors calculate the "catchment area" of your roof to specify the right drainage components. This prevents water from cascading over the sides of the building, which ... https://kkroofspecialist.com.sg/metal-roofing-contractor-singapore/