Method for manufacturing an element, said method comprising the steps of: - forming two outer-surface panels, i.e. a first outer-surface panel (12.1) and a second outer-surface panel (12.2), to be set facing each other, - spreading a first adhesive surface (16.1) on the first outer-surface panel (12.1), - forming a frame structure on top of the first adhesive surface (16.1), in order to support the outer-surface panels at a distance from each other, which frame structure conforms essentially to the outline of the outer-surface panels, - forming a suction arrangement inside the frame structure, in order to suck air from inside the element, - forming at least one insulation layer inside the frame structure by placing the insulation inside the frame structure on the first adhesive surface, the said insulation being a material impervious to air, - spreading a second adhesive surface (16.2) between the second outer-surface panel (12.2) and the insulation layer, and - creating a vacuum with the aid of the suction arrangement inside the frame structure in order to bring the first outer-surface panel (12.1) into film contact with the first adhesive surface (16.1) and the second outer-surface panel (12.2) into film contact with the second adhesive surface (16.2) characterized in that said method additionally comprises the steps of: - placing at least partly periodical separate spacer components against the inner surface of the frame structure between the said frame structure and the insulation layer as part of suction arrangement for forming an adhesive space as a non-unified space between the frame structure and the insulation for excess adhesive, in which the non-unified adhesive space contains several chambers for the excess adhesive separated from each other with the aid of the spacer components, and - sucking air from the suction arrangement through the adhesive space in order to suck the excess adhesive of the adhesive surface and the second adhesive surface into the non-unified adhesive space. - forming two outer-surface panels, i.e. a first outer-surface panel (12.1) and a second outer-surface panel (12.2), to be set facing each other, - spreading a first adhesive surface (16.1) on the first outer-surface panel (12.1), - forming a frame structure on top of the first adhesive surface (16.1), in order to support the outer-surface panels at a distance from each other, which frame structure conforms essentially to the outline of the outer-surface panels, - forming a suction arrangement inside the frame structure, in order to suck air from inside the element, - forming at least one insulation layer inside the frame structure by placing the insulation inside the frame structure on the first adhesive surface, the said insulation being a material impervious to air, - spreading a second adhesive surface (16.2) between the second outer-surface panel (12.2) and the insulation layer, and - creating a vacuum with the aid of the suction arrangement inside the frame structure in order to bring the first outer-surface panel (12.1) into film contact with the first adhesive surface (16.1) and the second outer-surface panel (12.2) into film contact with the second adhesive surface (16.2) - placing at least partly periodical separate spacer components against the inner surface of the frame structure between the said frame structure and the insulation layer as part of suction arrangement for forming an adhesive space as a non-unified space between the frame structure and the insulation for excess adhesive, in which the non-unified adhesive space contains several chambers for the excess adhesive separated from each other with the aid of the spacer components, and - sucking air from the suction arrangement through the adhesive space in order to suck the excess adhesive of the adhesive surface and the second adhesive surface into the non-unified adhesive space.