JOINT STRUCTURE OF LIGHT-WEIGHT FIRE-RESISTANT PARTITION WALL AND CONSTRUCTION METHOD THEREOF

PROBLEM TO BE SOLVED: To provide a gapped joint on the wall surface of light-weight fire-resistant partition walls in a simple operation without additional construction of a face member, yet with no use of special fire-proof joint filler, fire-proof joiner, or the like.SOLUTION: An underlayer face material (5) is horizontally attached to a stud (4), and a top-layer face material (6) is vertically attached to the indoor-side underlayer face material, such that neighboring side faces (62)of the top-layer face materials are separated from each other to form a gapped joint (31). An abutting joint (22) of the underlayer face material located at the joint bottom (33) of the gapped joint is airtight sealed with a seal material (15) across the joint width (W). A strip-shaped material (10) formed of noncombustible fiber material having air permeability is then laid on the joint bottom of the gapped joint, so that the joint bottom is masked from an indoor space (R) with the strip-shaped material.