Abstract
Some kinds of renewal method for existing external walls by application of net overlaying and anchoring have been developed. Characteristics, progress and durability of a method from them are reported in this paper. The method has been confirmed standard specifications based on many experimental evaluations in the biginnings of the devopment and investigation into the actual conditions have been continued for 20 years to evaluate the durability of the method. It is judged that physical properties change of applied materials has not been recognized in the present states.