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C�J <br />255 ll. Existing Structures (p.15) <br />256 A. Building Materials (p.15) Original exterior wall materials <br />257 in the district include brick, stucco, clapboard, wood <br />258 shingles, and masonry block. In some cases, vinyl or <br />259 aluminum siding has been applied over the original <br />260 material. <br />261 Required (p.15) <br />262 Original exterior building materials shall be retained when possible. <br />263 Deterioration of wood materials shall be prevented through repair, <br />264 cleaning, and painting. <br />265 The existing architectural detail around windows, porches, doors, and <br />266 eaves shall be retained or replaced by replicas of the same design when <br />267 deteriorated beyond repair. <br />268 Masonry, including brick and stucco structures, shall be cleaned only <br />269 when necessary to halt deterioration or to remove stains and shall be <br />270 done in a method acceptable for the preservation of the surface: i.e. low <br />271 pressure water and soft natural bristle brushes. <br />272 When repairing stucco, stucco mixture shall be used. <br />273 Ample ventilation must be afforded the structure when is installed, in <br />274 order to prevent increased deterioration of the structure from moisture <br />275 or insects. <br />276 Brick or mortar joints should be repointed only when there is evidence <br />277 of moisture problems, or when sufficient mortar is missing to allow <br />278 water to stand in the mortar joint. <br />279 Existing mortar shall be duplicated in composition, color, texture, joint <br />280 size, method of application, and joint profile. <br />281 When repairing stucco, a professional shall make a study of the old <br />282 stucco, to determine the exact mixture and underlayment used in the <br />283 original work. Some repair methods are not compatible with the original <br />284 techniques and may cause early disintegration of the repair work and <br />285 the original work. <br />11 <br />