NOVELTY - A modular cover for industrial building, comprises one or more modules each comprising a first and a second covering panel (1, 2) forming an angle one with respect to the other, a first and respectively a second group of connection profiles (3, 4) of the first and respectively second panel (1, 2) to a first and respectively a second covering beam (5, 6) of the building, a third group of connection profiles (7) between the first and second panel (1, 2).    USE - The modular cover is used for industrial building (claimed).    ADVANTAGE - The covers of industrial buildings have plates in an asbestos-based material or other material harmful to health. The decontamination of the cover in general is simply limited to eliminating the drawbacks lamented in the original cover. The modular cover has diversified functionalities encouraging its adoption both for the substitution of covers of still existing industrial buildings, and for the construction of new industrial buildings. The method for installation of a modular cover can be adapted very easily to any existing structure. The cover can be applied on existing buildings without having to modify anything of their structure and in particular without having to intervene with stoneworks on what still existing. The cover is adapted to any structure and to any amplitude of existing span. The cover integrates itself architecturally without protruding from the defined limits for the building.    DETAILED DESCRIPTION - A modular cover for industrial building, comprises one or more modules each comprising a first and a second covering panel (1, 2) forming an angle one with respect to the other, a first and respectively a second group of connection profiles (3, 4) of the first and respectively second panel (1, 2) to a first and respectively a second covering beam (5, 6) of the building, a third group of connection profiles (7) between the first and second panel (1, 2). The first and respectively second group of profiles (3, 4) are provided with vice connection means with the first and respectively second beam (5, 6) and with hinge connection means with the and respectively second panel (1, 2). The third group of profiles (7) is provided with hinge connection means between the first and second panel (1, 2). INDEPENDENT CLAIMS are:    (1) an industrial building comprising a cover with photovoltaic panels; and    (2) a procedure for the laying of a modular photovoltaic cover onto covering beams (5, 6) of an industrial building.    DESCRIPTION OF DRAWING(S) - The drawing shows a front view of a module.    Covering panels (1, 2)    Connection profiles (3, 4, 7)    Covering beams (5, 6)    Cylindrical portion (8)    Profile (10)