Only appropriate when the physical condition of character defining materials and features warrant additional work. Should begin with least degree of intervention possible. Same material is preferred, but substitute is acceptable if the form, design and material convey the visual appearance of the feature and finish. C. Replace 1. replace an entire character defining feature with new material. If the essential form and detailing are evident from the physical evidence then replacement is appropriate.
Preferred option is replacement of the entire feature in kind.
Never replace a character defining feature if although deteriorated, it could be repaired. D. Design for Missing Historic Features 1. Recover is always the preferred course of action. If adequate historical, pictorial, and physical documentation exists to reestablish the feature as part of the appearance, then designing and constructing a new feature based on the evidence is appropriate. E. Alterations and additions.