Effective water management for metal roofing Singapore includes custom-designed gutter and downspout systems capable of handling the extreme flow rates typical of tropical downpours. Contractors calculate the roof's area and local rainfall intensity to ensure gutters and downspouts are adequately sized (often 6-inch or larger commercial sizes) and correctly sloped to prevent overflow ... https://kkroofspecialist.com.sg/metal-roofing-singapore/