| 摘要 |
Openings in a board building material are formed by a large number of recesses (13) or by through-holes (12) and the recesses (13). The bottom surface (16) of each recess (13) is formed as a surface into which an engagement member (70) can be screwed or driven. The color of the bottom surfaces of the recesses is set to brightness relatively lower than the brightness of the color of a board surface (18). The base material of the board building material is a gypsum board, and the bottom surfaces of the recesses are formed by gypsum board base paper. In such a board building material, the region in which the engagement members are screwed or driven can be secured without impairing regularity, uniformity, or design features of the openings, and in addition, puttying etc. of portions where the engagement members are exposed can be eliminated. ® KIPO & WIPO 2007
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