1x adjustable roof hook with an additional fastening plate, suitable for installing substructures on roofs with plain tiled roof coverings. Roof hook is screwed into a wooden rafter. Fastener 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.