In term of identification of defects, there are huge issues and defects on the material that ought to be preserved properly. Most of them need to be solved by variety technique such as cleaning, replacement, and treatment. As state by Morris (1877) reported to external wall or coverings, “Any method that is adopted must avoid damaging the face of the material” There classifies the method of reparation in 3 namely a material needs treated suddenly, a material have to repair and a material should to solve.