EXTERNAL HEAT INSULATION STRUCTURE OF BUILDING HAVING CANTILEVER SLAB

PROBLEM TO BE SOLVED: To provide an external heat insulation structure capable of solving a problem where heat insulation performance is lowered in that a cantilever slab is a heat bridge without sharing an internal heat insulation construction method and without performing excessive working so as to cover the whole face of the cantilever in a building having the concrete cantilever slab. SOLUTION: In the external heat insulation structure of the building sticking a heat insulation material 4 on a face of an outdoor side of a concrete wall 1 and having the cantilever slab 3 providing an air layer 5 and an external facing material 6 on the outside, an end 4a of the heat insulation material 4 is folded back along a lower face and an upper face of the upper and lower cantilever slabs 3 in a thickness of the air layer 5.