| 摘要 |
PROBLEM TO BE SOLVED: To provide a plate material optimum for floor heating which can make the best of a fine sight of a surface of the plate material, controls generation of a warpage or a clearance of a floor surface and can suppress the number of manhours for construction work. SOLUTION: A plate material obtained by cutting broad leaf tree such as white oak and the like is heated at a specific high temperature, Then, the surface is polished, a tongue is protruded and a groove is bored. Thereafter, by applying a natural fat and oil-made based coating or synthetic resin based coating having permeability to the plate material to the surface, expansion or contraction in a plate width direction is controlled less.
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