Apparatus for mounting safety railing to a roof comprising a face plate extending along the length of the roof. A mounting plate arranged to be mounted to the face plate of the roof. A receiving hole on the mounting plate arranged to receive a vertical support post thereby supporting the post in a vertical position preventing horizontal movement of the post. A safety rail arrangement supported by the vertical post. A first end of the post is arranged to be supported in a vertical manner to a suitable support below the mounting plate.