a fully adjustable , simplified system for installing a sloping roof on top of an existing flat roof is disclosed . top and bottom roof spanning members are interconnected by individually vertically adjustable stanchions and the stanchions in the system are cross - braced in two orthogonal planes . the top and bottom spanning members of the system can be parallel or perpendicular to each other and the bottom spanning members can be eliminated and replaced by individual bearing plates where the existing roof structure allows direct loading at localized points . the system utilizes precut and prepunched components and utilizes offset hole punching to achieve a fine degree of adjustability which renders the system highly versatile .