To provide a composite floor material and its joint structure by which excellent dimensional stability can be obtained, and the construction can be carried out easily without a need for a fixing means like an adhesive agent, nails or screws, or other construction members.
The composite floor material A comprises a base member 1 and a floor finishing member 2 laid on the base member 1. A groove 31 and a tongue 32 are respectively formed in longitudinal side faces of the floor finishing member 2, which is the upper layer, and a floor finishing member 2a which is adjacent when the composite floor material A is laid. A base member 1 arranged as the lower layer and an adjacent base member 1a have a recess 41 and a projection 42, respectively, at the end parts for male/female vertical joint. The base member 1 on the side where the groove 31 of the floor finishing member 2 is formed is arranged in a manner of projecting to the outside of the groove 31, and the recess 41 is formed in the projecting part 11. The base member 1a on the side where the tongue 32 of the floor finishing material 2a is formed is arranged in a retreating manner leaving a surplus length part 11a on the upper part, and the projection 42 is formed downward on the surplus length part 11a.
FURUICHI SUNAO
HOSHINO MINORU
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