Abstract: A method, in which a water-proof sheet prefabricated in the factory is bonded or stuck to an outer wall. This water-proof sheet is an exterior water-proof ornamental sheet according to the present invention, that is, a sheet comprising a fibrous sheet member, water-proof layer and ornamental layer laminated in this order, in which a part of the water-proof layer is formed by impregnating said fibrous sheet member with water-proof paints used for the formation of this water-proof layer. This sheet was stuck to the outer wall surface using adhesives or stuck to the outer wall surface through an adhesive water-proof rubber sheet to form an outer surface of the outer wall, whereby succeeding in the construction of a highly water-proof outer wall.In addition, the improvement of weather-resistance and contamination-resistance could be attained by forming a top coat paint film layer formed of paints capable of improving such performances on the above described sheet like ornamental layer.