To reduce the time to attach scaffoldings to pre-built buildings.SOLUTION: A longitudinal method of an extrusion cement board 1 having a hollow part 2 in which while the cement plates 1 are adjacent to each other, a scaffold connecting fitting 5 is placed on a receiving angle 9, in the hollow part 2, a part of the scaffold connecting fitting 5 is inserted, and the joint portion is filled with a caulking agent 7 through a backup material 8. The above-mentioned a scaffold connecting fitting is joined to a nut 5a and a stop piece 5b of L form reversely inverted in the side view.SELECTED DRAWING: Figure 3
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