To prevent explosive combustion of polyurethane foam when it is used as a heat insulating material by making combustible gas, even if generated by the combustion of the polyurethane foam, unlikely to be a accumulated at the ceiling side and corners which being the boundaries between the ceiling face and a wall face.
A molding plate of a heat insulating material (polystyrene foam or polyethylene foam) 3 that melts at 250°C or lower is stuck to a ceiling face. Polyurethane foam 4 is sprayed to a wall face. An inorganic paint 5 is applied in a thickness of 5 mm or more to the surface of the heat insulating material at a corner which serves as the boundary between the ceiling face and the wall face. The ranges of application of the inorganic paint 5 are 1 m or more along the ceiling face and the wall face, from the boundary position between the ceiling face and the wall face.
MIZUNO KEIZO
TANIGAKI KATSUHIKO
KOBAYASHI SADAO
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