Gutters and downspouts serve their purpose inside and out. They prevent damage to a structure's interiors such as wet basements and walls. They also prevent damage to exteriors such as stucco, brick, and siding and deter splashing on foundation and house. Not only does exterior damage prevention pertain to the residential or commercial structure, but to shrubs and flowers or ruts in the lawn. Gutters and downspouts also add neat architectural lines at eaves.