A method and kit for installing siding panels to an exterior surface of a structure. The method and kit are directed to the positioning of a mending plate between the ends of horizontally adjacent siding panels. Lines of an adhesive are applied to the mending and the mending plate is disposed approximately midway between the ends of each of the adjacent first and second siding panels. Pressure is applied to the ends of the siding panels that are disposed over the respective portions of the mending plate thereby uniformly spreading the adhesive across the back surface of the siding panel and the mending plate to enhance the chemical bond of the adhesive once fully cured.