The invention relates to a short-corner structure of a log building, in which the logs of the first wall (1) and the logs of the second wall (2) are fastened to each other by means of a corner joint. The corner joint is preferably a locking joint, which interlocks the ends of the logs as immobile in relation to each other. The short-corner structure is covered from the outside by vertical corner boards (11) installed on the corner. The basic idea of the invention is that at least one layer of windstop material (8, 10) is arranged on the corner area, with the purpose of improving the airtightness of the short-corner structure. The windstop material is fastened on the exterior surface of the log in a way that in the complete structure it remains invisible under the corner boards. The windstop material to be used is preferably windproof paper and/or windproof board. Advantageously, an end thinning (4) is cut on the exterior surfaces of the log ends so that the distance of the edge (7) of the end thinning from the outer corner (14) is larger than the width of the log at the end thinning. A corner batten (9) is fastened at the edge of the end thinning, and the edges of the windproof paper are extended under the corner battens. A ventilation gap (13) is arranged between the windstop material and the corner board.
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