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11. Cleaning of masonry is discouraged and should he performed only when <br /> necessary to halt deterioration. <br /> 12. If the building is to be cleaned, the mildest method possible shall be <br /> used. <br /> 13. A test patch of the cleaning method(s) shall be reviewed and approved on <br /> site by staff of the Boston Landmarks Commission. Test patches should <br /> always be carried out well in advance of cleaning (including exposure to <br /> all seasons if possible). <br /> 14. Sandblasting (wet or dry), wire brushing, or other similar abrasive <br /> cleaning methods shall not be permitted. Doing so changes the visual <br /> quality of the material and accelerates deterioration. <br /> 15. Waterproofing or water repellents are strongly discouraged. These <br /> treatments are generally not effective in preserving masonry and can cause <br /> permanent damage. The Commission does recognize that in extraordinary <br /> circumstances their use may be required to solve a specific problem. <br /> Samples of any proposed treatment shall be reviewed by the Commission <br /> before application. • <br /> 16. In general, painting masonry surfaces shall not be allowed. Painting <br /> masonry surfaces will be considered only when there is documentary <br /> evidence that this treatment was used at some point in the history of the <br /> property. <br /> C. Wood <br /> 1. All (List the wood surfaces,features, details and ornamentation of the <br /> building that need to be preserved, such as: clapboards, cornices, <br /> brackets, entablatures, shutters, columns, balustrades, shingles, etc. <br /> Also include paint colors and finishes.) shall be preserved. <br /> 2. Original or later contributing wood surfaces, features, details and <br /> ornamentation shall be retained and, if necessary, repaired by patching, <br /> piecing-in, consolidating or reinforcing the wood using recognized <br /> preservation methods. <br /> 3. Deteriorated or missing wood surfaces, features, details and ornamentation <br /> shall be replaced with material and elements which match the original in <br /> material, color,texture, size, shape,profile and detail of installation. <br /> 4. When replacement of materials or elements is necessary, it should be <br /> based on physical or documentary evidence. <br />