| 摘要 |
PROBLEM TO BE SOLVED: To improve thermal conductivity between a hot water pipe and a floor material and to increase the elevation speed of a floor surface temperature and thermal efficiency, in the floor material for a heating floor. SOLUTION: In the floor material A1 used in a hot water type heating floor, a recessed groove 20 for insertion of a hot water pipe having both depth and a groove width increased to a value larger than the diameter of a hot water pipe P being inserted is formed in a serpentine state in the back of the floor material.
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