US Patent 8640420 Pergola system

A pergola system includes a frame having a plurality of generally vertically-oriented, spaced-apart posts aligned in rows. A generally horizontally-oriented, spaced-apart frame member is attached to each row of posts. A plurality of rails and outer rails extend across the frame members and are oriented generally orthogonally to the frame members, the rails being attached to the frame members. A plurality of purlins extend across the rails outer rails, and are oriented generally orthogonally to the rails and outer rails, the purlins being attached to the rails and outer rails. The pergola system is freestanding.