Insulation of condominium or apartment buildings used to be done from the inside by interior insulation in most cases because of ease of construction and cost reduction. However some shortcomings of this method have been pointed out, such as formation of dewdrops on the inner wall, which causes generation of termite and harmful fungus. To overcome those shortcomings and to improve building durability as well, Daiho Corporation developed an exterior insulation method, which features inorganic insulation panels inside the exterior wall.