Particle board and plywood are composed of pieces of wood products that have been pressed and glued together. Although they are popular siding materials for storage units, they are not most people's first choice in regions where it rains a lot. For if water does work its way into these products (a possibility enhanced by their composite nature), then you're lost.
storage shed home depot plans best of fancy two story sheds are built with double wall panels to resist dents. The panels are made to exacting standards for a snug fit and solid construction. Many come with paintable steel doors for extra security and long service life. Best of all, the entire structure is impervious to practically all weather extremes and virtually maintenance free.