INSULATION STRUCTURE OF BUILDING

PROBLEM TO BE SOLVED: To provide an insulation structure of a building having heat insulation plates 1a and 1b formed of synthetic resin extruded foam boards attached to a skeleton 2 of the building, which can suppress opening of a joint resulting from contraction with time due to stress relaxation.SOLUTION: Each of insulation plates 1a and 1b with a square plane has two sides opposed to each other with an opposing direction identical to an extrusion length direction during extrusion molding, and other two sides opposed to each other with an opposing direction identical to an extrusion width direction during extrusion molding. The insulation plate 1a in the extrusion length direction and the insulation plate 1b in the extrusion width direction are alternately attached in the same direction.