Structural Systems. a. Repairing exposed or unexposed elements of the structural system by augmenting or upgrading individual parts or features using recognized preservation methods. For example, weakened structural members such as floor framing can be paired with a new member, braced, or otherwise supplemented and reinforced. b. Replacing in kind those visible portions or features of the structural system that are either extensively deteriorated or missing is approved when there are surviving prototypes and the replacement matches the old in material, design, color, and texture. c. Using substitute materials may only be considered for unexposed structural elements, such as roof rafters or trusses.
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Sources: Programmatic Agreement, Programmatic Agreement, Programmatic Agreement