HEAT-INSULATING MATERIAL AND MANUFACTURING PROCESS THEREFOR, AND INSULATION METHOD

There are provided an insulation panel and a process for performing thermal insulation by means of the insulation panel, which are capable of obtaining an excellent thermal insulating property, even in, e.g. a case where a space for filling an insulation panel is limited. A insulation panel 1 including a rigid polyurethane foam 20 and a vacuum insulation panel 10 embedded in the rigid polyurethane foam 20; the vacuum insulation panel 10 including an outer sheath 16 having an airtight property, and a molded product 14 having a core material 12; the core material containing fumed silica (A) and fumed silica with a binder (A'), which has a binder applied to the surface of the fumed silica (A); the molded product 14 being decompressed and encapsulated in the outer sheath 16; and the rigid polyurethane foam 20 having open cells formed therein. A process for mounting the insulation panel 1 to a mounting surface.