Patent ID: 6895721

Claim:
A method of fastening a building board to a framework of a building, which is characterized in that a building board having flat configuration and provided on the rear surface thereof with engaging protrusions of substantially similar shapes, and an elongated fixture which is adapted to be detachably engaged with the building board are employed, and that the building board is assembled, prior to fastening to said framework, together with the elongated fixture through an engagement between the engaging protrusions and the elongated fixture, and then the elongated fixture is fixed to the framework of a building, thereby fastening the building board to the framework of a building, wherein said fixture is constructed such that it comprises a main body which is designed to be entirely or partially contacted with the rear surface of a building board; engaging holes of substantially similar shapes formed in the main body; a rising portion formed at one end in the longitudinal direction of the main body; an engaging region formed at or near said rising portion; an extension portion extending from the distal edge of said rising portion in a direction away from and parallel with said main body; and an engaging tongue formed at the other end in the longitudinal direction of the main body; wherein said engaging tongue is positioned and shaped such that it is inserted into said engaging region of the fixture attached to a neighboring building board as a couple of building boards each having the fixture attached to the rear surface thereof are positioned neighboring in vertical direction; and comprising disposing a first building board at a lower level, fastening said first building board to the framework of a building by taking advantage of the fixture attached to the rear surface of the building board, disposing a second building board over said first building board along the upper horizontal edge of said first building board, and fastening said second building board to the framework of a building by inserting the engaging tongue of the fixture attached to the rear surface of the second building board into the engaging region formed in the fixture of the first building board.