To mount a new roofing material, etc., without dropping chippings, etc., indoors in the case of the repair of a roof like a slate roof, etc., wherein a bolt is protruded from a roof surface.

The roof overlap surface part 2 of a component A is laid on the roof surface while inserting the periphery 55 of the bolt for the slate roof 50 into a periphery-of-bolt inserting hole 5, and the lower end parts of leg parts 11 and 11 are inserted into the leg-part inserting hole parts 6 of the component A while inserting a bolt part 52a into a bolt inserting part 12 in order to install a component B on the component A in a standing manner. A covering surface part 14 is laid on the top surface part 10 of the component B while inserting the bolt part 52a into the bolt inserting hole 15 of the component C, and a component D is screwed for clamping into the bolt part 52a protruding above the components A, B, and C for the purpose of fixing a roof repairing implement 1 on the roofing material 51. Consequently, the mounting of the implement 1 by means of the bolt protruding above the roof surface allows the new roofing material or a purlin material, i.e., a foundation, such as a thermal insulating material, etc., to be mounted on the purlin fixing wall part 4 of the component A.