| 15 | Sealing inactive cracks in concrete by pointing with a cementations mortar, or injecting epoxies to prevent moisture from entering the concrete mass. | cracks with hard mortars or other hard Sealing active materials that could prevent seasonal movements. Repairing cracks in concrete elements, without first determining the cause or significance of the crack |
| 16 | Replacing in kind extensively deteriorated or missing parts of concrete elements, based on documentary and physical evidence | Using replacement material that is incompatible with adjacent concrete work Recreating formwork finishes, such as form lines, wood grain, or knots, using grinders or trowels. |
| 22 | Replacing in kind a concrete element from the restoration period that is too deteriorated to repair , based on documentary and physical evidence. The new work should be well documented and unobtrusively dated to guide future research and treatment, | Removing an irreparable concrete element from the restoration period and not replacing it, or replacing it with an inappropriate new element. |