Architectural Detailing - Edward Allen, Patrick Rand
Preventing the presence of water on a vertical surface can be effectively managed by overhanging the sloped surface above the vertical surface, allowing water the chance to drip to the ground. The most common and visually apparent example of this is a roof overhang. The width of the overhang beyond the wall surface is determined by the height of the wall we are trying to keep dry and any wind forces that might push the water onto the vertical surface. The taller the wall, the longer the overhang should be.