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2. Protect and maintain historic commercial buildings and storefronts and their character-defining features. 3. Repair historic commercial buildings and storefronts and their character-defining features and materials in-kind using acceptable preservation methods matching the original as closely as possible in design, material, scale, size, shape, pattern, composition, color, texture, and finish.. 4. Replace historic features and details of commercial buildings and storefronts only when the original is deteriorated beyond repair. Replace only the deteriorated portion in-kind, matching the original in design, materials, scale, size, shape, pattern, composition, color, texture, and finish.
5. If a feature or detail of a commercial building and storefront is missing, replicate it based on physical or documentary evidence, with features and details that match the original as closely as possible in design, materials, scale, size, shape, pattern, composition, color, texture, and finish. 6. In order to avoid creating a false sense of history, it is inappropriate to add architectural features, elements, and details to historic commercial buildings and storefronts without documentary evidence. 7. It is appropriate to repair masonry building materials using appropriate preservation methods. See the Design Standards for Brick and Masonry on page 63 for more information. 8. It is appropriate to use the gentlest means possible for cleaning historic building materials on commercial buildings and storefronts. For wood, use low-pressure washing with detergents and natural bristle brushes. For masonry, chemical solutions and cleaning methods must first be tested in small inconspicuous area. Treat architectural metal according to its hardness. For soft metals test chemical solutions to ensure they will not damage the color and texture of the surface. It is inappropriate to treat soft metals with any type of abrasive pressure blasting. Clean hard metals with hand scraping and wire brushes. It is inappropriate to clean historic building materials with damaging methods, including but not limited to: high-pressure power washing, sandblasting, and propane or butane torches. Contact the Preservation Planner for acceptable cleaning methods. Also see the National Park Service Preservation Briefs, link contained in
prot ect HISTORIC COMMERCIAL BUILDINGS & STOREFRONTS w i t h rou t i ne MAINTENANCE inspections of historic commercial buildings and storefronts. • Clean metals using the gentlest means possible and apply a metal primer before painting when applicable. • Apply flexible sealants and caulking to wood joints to protect them from moisture. • Maintain a sound paint film on wood and metal building materials. • Promptly repair cracks, deteriorated mortar, areas of structural settlement, and missing masonry on masonry buildings. • Ensure that the roof and its drainage system are clear • Conduct routine of debris and shedding water properly. Ensure that drainage around the building is adequate. • Keep historic commercial buildings and storefronts free of vegetation and debris.
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