| 摘要 |
PROBLEM TO BE SOLVED: To provide a grooved building board which is prevented from curling and formation of pocket waves caused by residual stress distortion etc. SOLUTION: The grooved building board is laterally asymmetrically formed, and set up by arranging a rise portion 2 on one side of a flat main board 1 and a covering rise portion 3 on the other side so as to cover at least an upper edge of the rise portion 2. In the grooved building board, the flat main board 1 has transverse ribs 1a serially formed thereon orthogonally to a longitudinal direction of the main board except banded flat portions 1b, 1b on both sides of the flat main board 1, and the rise portion 2 has longitudinal ribs 2c serially formed thereon. COPYRIGHT: (C)2006,JPO&NCIPI
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