1x adjustable roof hook with an additional fastening plate, suitable for installing substructures on roofs covered with roof coverings such as Tondach, Bramac, Creaton and similar. Roof hook is screwed into a wooden rafter. It has an additional fastening plate intended for adjusting the point of fastening in the transversal direction. Hooks height can be adjusted depending on the height of the roof coverings and the thickness of the batten. An adjustment range of 7 mm enables adjustment of the roof hook according to the base plate. In a set together with fastening bolts.