UNDERFLOOR MATERIAL AND UNDERFLOOR STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide an underfloor material and its construction structure capable of being simly handled, at the same time, cutting off humidity from the underfloor ground and preventing an underfloor environment from mold development. SOLUTION: The 1 underfloor material laid on the ground 4 under the floor includes a ground basic material layer 2 and a surface basic material layer 3, and it is formed in the shape of a belt-sheet. The surface basic material layer 3 is narrowly formed in comparison with the ground basic material 2, and it is so constituted that connection margins 11 only for the ground basic material layer 2 are formed in at least one side along the longitudinal direction. The ground basic material layer 2 is constituted of a waterproof thermal insulating sheet material 21 and a contact surface reinforcing sheet material 22 for preventing the occurrence of the rupture of pin-hole of the like in the waterproof thermal insulating sheet material 21. The surface basic material layer 3 has at least one of moisture-absorption and adsorption and antibacterial property. The surface basic material layer 3 is constituted of a cross-linked acrylic fiber.