The ceiling surface of the gapless ceiling buckles by receiving compression force by inertial force from the wall. In this paper, two buckling modes and their corresponding strength prediction formulas were examined. One is the buckling between hanging bolts, where the gypsum board and the joist receiver buckle together. The other is the buckling between joists, where the gypsum board buckles out-of-plane and the joist receiver buckles in-plane. We revise the strength prediction proposed by a previous study and investigate its validity using new test specimens. The causes of the discrepancies in the predicted results are examined. Additionally, the axial force distribution of joist receivers and gypsum boards in the joist receiver direction of gapless ceilings is investigated.
