The present invention winter cold is, summer is hardly felt heat, to provide a surface irregularities with a wooden board, which also help to sound effects so be suppressed echo significantly even when used in walls and ceilings. By using a plate that has been subjected to irregularities or projection of A large and small, it means that support the back foot at the point, small ground contact area, in order to indoor air enters also into the gap that is supported by a point, the winter is cold in summer hardly feel directly the heat. Also it is possible to solve also slippery drawback, also help to fall accident prevention If you use such as bathroom floors and stairs. Even when used for walls and ceilings, and is useful in sound effects and therefore be suppressed greatly echo. Further, the block shape of the appropriate size, allow also the construction of the prefabricated by applying the grooving of the male and female in the portion of the four sides of the side surface and the bottom, so the remaining edge material or the like is also reusable in building materials, It helps significantly to the effective use of resources. .BACKGROUND
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