Often described as the « fifth façade », the flat roof is extremely popular with architects. Its essential task is to shelter the space beneathit from the elements. Beyond this, the use of flat roofs may be optimized by integrating them as green roofs, roof terraces, circulationareas, and even productive solar roofs.In practice, however, their correct and professional realization is a highly exacting task : in addition to providing the planner with basicrules of construction and design, the Flat Roof Manual also supplies an overview of the use and construction types as well as the standardassemblies for flat roofs. Together with the most important standards and bodies of regulations, construction drawings of the principalconnection points round out the volume.