Designed to keep the area beneath an elevated deck dry, the Haven Underdeck System uses lightweight, durable aluminum panels to channel water to a gutter system and downspouts. The company says that these panels will not rust or become brittle, and individual panels may be removed later without disturbing adjacent ones. Homeowners can choose options such as LED lighting, speakers, swings, and fans. More than 27 colors are available. Pricing varies based on project scope and size. havenunderdeck.com