What makes a picket patio cover different than a solid roofed patio cover? First and foremost, the term patio cover is widely used to describe a multitude of covered patio types. For example, the term Pergola best describes an open or lattice type cover almost like an arbor but larger. Lattice pergola Covers in Los Angeles are open with shade bars which run perpendicular to the rafters and are generally much smaller than all of the other components which make up the entire cover. They provide shade but no guard from rain. Lattice patio covers are the most affordable of all patio covers we offer.