| 摘要 |
PROBLEM TO BE SOLVED: To develop and provide a sub-floor material which makes finishing good in a coating finish and the execution of work for a flooring material such as a thin P tile, by using a sub-floor material using a strong plate whose surface is hard and smooth. SOLUTION: This sub-floor material is characterized as follows: a surface of a wood board 1 is composed of a fiber layer 1a having a density equivalent to that of MDF (a medium density fiberboard) or a hard board; a central layer of the wood board 1 is composed of a veneer layer 1b equivalent to a strand board; a recessed tongue 3a and a protruded tongue 3b are formed in one side surface 2 of the wood board 1 and the other side surface 2 thereof, which face each other, respectively; and at least one cross-sectional outer-hull line X of at least one column is described and indicated in an superimposed manner at a corner part of the wood board 1 or the corner part and a central part of a long side. COPYRIGHT: (C)2004,JPO
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