| 摘要 |
PROBLEM TO BE SOLVED: To solve problems of the deterioration of an airtight performance resulting from the peeling off of an airtight tape 3 due to secular change because the pressing against the airtight tape 3 is not considered in an externally heat insulating structure of an insulator board not laminated, for example, in a document 2. SOLUTION: In a foaming plastic insulator board having a shiplap structure on at least a set of sides opposed to each other, a foaming plastic insulator board having an airtight tape stuck on the vertical contact surface of at least one shiplap part is installed on the outdoor side of a wooden framework structure formed of columns, beams, and sills so that the sides having the shiplap parts become horizontal so as to form a heat insulating airtight structure. Thus, the airtight tape is sandwiched and pressed tightly by the shiplap parts.
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