Installation and construction method of wall panel

An installation and construction method of a wall panel for installing the wall panel to a pair of wooden columns and a wooden horizontal member, the pair of wooden columns being installed in a standing manner so as to be spaced apart from each other, the wooden horizontal member being installed to the pair of wooden columns,

• the wall panel including:
• a first panel having a stud being fixed on a first plate surface of a surface member;
• and a second panel having the stud on a first plate surface of the surface member and having a joining member being fixed on an upper end portion of the first plate surface of the surface member, the joining member extending in a horizontal direction,
• the method comprising:
• installing the wooden horizontal member to the pair of wooden columns;
• fixing joining metal fittings on respective side surfaces of the pair of wooden columns, the side surfaces facing each other;
• disposing the joining member of the second panel between the pair of wooden columns and in a substantially center of a height direction of the pair of wooden columns;
• after spacing both end portions of the joining member in a longitudinal direction completely apart from the respective side surfaces of the pair of wooden columns at a predetermined interval, joining the both end portions of the joining member in a longitudinal direction to the respective side surfaces of the pair of wooden columns with the joining metal fittings, and adjusting erection of the wooden columns, fixing edge end portions of the surface members of the second panel to front surfaces of the pair of wooden columns and a front surface of the wooden horizontal member;
• installing the first panel in a position higher than a position of the second panel;
• and
• fixing edge end portions of the surface members of the first panel to a front surface of the joining member, respective front surfaces of the pair of wooden columns, and connecting the first panel and the second panel in a height direction.