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5. If using the same material is not technically or economically feasible, then <br /> compatible substitute materials may be considered. <br /> 6. Cleaning of wooden elements shall use the mildest method possible. <br /> 7. Paint removal should be considered only where there is paint surface <br /> deterioration and as part of an overall maintenance program which <br /> involves repainting or applying other appropriate protective coatings. <br /> Coatings such as paint help protect the wood from moisture and ultraviolet <br /> light and stripping the wood bare will expose the surface to the effects of <br /> weathering. <br /> 8. Damaged or deteriorated paint should be removed to the next sound layer <br /> using the mildest method possible. <br /> 9. Propane or butane torches, sandblasting, water blasting or other <br /> abrasive cleaning and/or paint removal methods shall not be <br /> permitted. Doing so changes the visual quality of the wood and <br /> accelerates deterioration. <br /> 10. Repainting should be based on paint seriation studies. If an adequate <br /> record does not exist repainting shall be done with colors that are <br /> appropriate to the style and period of the building. <br /> D. Architectural Metals (Cast Iron, Steel, Pressed Tin, Copper, Aluminum <br /> and Zinc) <br /> 1. All (List the metal materials,features, details and ornamentation of the <br /> building that need to be preserved, such as: cast iron facades, porches <br /> and steps;sheet metal cornices, roofs, roof cresting and storefronts; and <br /> cast or rolled metal doors, window sash, entablatures, and hardware etc. <br /> Also include paint colors and finishes.) shall be preserved. <br /> 2. Original or later contributing metal materials, features, details and <br /> ornamentation shall be retained and, if necessary, repaired by patching, <br /> splicing or reinforcing the metal using recognized preservation methods. <br /> 3. Deteriorated or missing metal materials, features, details and <br /> ornamentation shall be replaced with material and elements which match <br /> the original in material, color, texture, size, shape, profile and detail of <br /> installation. <br /> 4. When replacement of materials or elements is necessary, it should be <br /> based on physical or documentary evidence. <br />