PURPOSE:To improve the efficiency of assembly operation at a field by installing a connecting material with a recessed section engaged with a joint filler at an end section while fitting a joint material, both ends of which have protrusions, between units. CONSTITUTION:Recessed sections 21A engaged with joint fillers 22 are formed at the connecting ends of connecting materials 21 constituting ceiling material 20 disposed in tension to a plurality of residence units 10, 11. A joint material 25, both ends of which have protrusions 25B, are fitted between the units 10, 11. The joint fillers 22 are inserted among the ceiling material 20 and the joint material 25, the joint material 25 is fixed by a nail 26, and the ceiling material 20 between both units 10, 11 and connected. Accordingly, the efficiency of assembly operation can be improved.
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