Abstract: The present invention relates to an on-site mobile facility for shielding from wind exerting a wind load on the facility, rain or snow when constructing, renovating or assembling a building, a bridge or a wind turbine, the on-site mobile facility covering an area having boundaries and corners, comprising: a plurality of modules, each module having a module roof structure, the module roof structures being mounted as a facility roof structure connecting horizontal beams of the module roof structures, the facility roof structure having edges and the horizontal beams defining the edges which are supported by legs, the legs and the beams defining side areas, the side areas being covered by a shielding arrangement, the shielding arrangement of the side area comprising elongated elements, and cover material, such as tarpaulin, being arranged between the elements and connected therewith, wherein the on-site mobile facility further comprises a guide system for guiding the shielding arrangement of the side area, the gu