The pergola is an architectural and structural element; conformed by a corridor flanked by vertical columns that support longitudinal beams that join the columns of each side; and other cross-sections supported on the previous ones at an equal or greater height joining both sides and forming an open lattice; the pergola can be independent or attached to a building or other structure in which case the pillars are usually removed and the sleepers on that side attached to the existing structure. the most common use is the protection of passage areas of a landscaped area; but they can also be part of a building or a house as a protection for pedestrian zones. isometric - elevation - sections in autocad - dwg.