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STANDARDS AND GUIDELINES: RIVERSIDE DRIVE LOCAL HISTORIC DISTRICT EXISTING STRUCTURES A. BUILDING MATERIALS Original exterior wall materials in the district include limestone, flagstone, stucco, clapboard, wood shingles, sandstone and masonry block. In some instances, vinyl or aluminum siding has been applied over the original surface. Required Original exterior building materials shall be retained. Deterioration of wood materials shall be prevented through repair, cleaning and painting. The existing or original architectural detail around windows, porches, doors and eaves should be retained or replaced by replicas of the same design and materials when deteriorated beyond repair. Masonry including brick, limestone, flagstone, sandstone and stucco shall be cleaned only when necessary to halt deterioration or to remove stains, and shall be done with a method acceptable for the preservation of the surface: i.e. low pressure water and soft natural bristle brushes. When repairing stucco, stucco mixture compatible in composition, color and texture shall be used. Recommended Whenever possible, the original building materials should be restored. Metal or vinyl siding may be used when it is the only alternative to maintaining or replacing the original surface material. When used over wood surfaces, this siding should be the same size and style as the original wood. Every effort should be made to retain the original trim around windows, doors, cornices, gables, eaves and other architectural features. Ample ventilation must be afforded the structure when metal or vinyl siding has been installed in order to prevent increased deterioration of the structure from moisture and/or insects. Mortar joints should be repointed only when there is evidence of moisture problems or when sufficient mortar is missing to allow water to stand in the mortar joint. Existing mortar shall be duplicated in composition, color, texture, joint size, method of application and joint profile. It is emphasized that, prior to initiating any restoration or rehabilitation effort, the property owner should contact the Historic Preservation Commission of South Bend and St. Joseph County which is located in the County/City Building of South Bend. The Commission is an invaluable source of information about all facets of rehabilitation and restoration. Prohibited Wood siding shall not be resurfaced with new material which is inappropriate or was unavailable when the building was constructed, such as artificial stone, brick veneer, asbestos or asphalt shingles. Sandblasting or the use of harsh detergents shall not be used on masonry including brick, stucco, limestone, flagstone and sandstone. This method of cleaning erodes the surface material and accelerates deterioration. Brick surfaces shall not be painted unless they had been painted originally. Repointing shall not be done with a mortar of high Portland cement content which can often create a bond that is stronger than the building material. This can cause deterioration as a result of the differing coefficient of expansion and the differing porosity of the material and the mortar which can result in serious damage to adjacent brick. Paint shall not be removed from masonry surfaces indiscriminately. Not Recommended Waterproof or water repellent coatings or surface consolidation treatments should not be used on masonry surfaces unless required to solve a specific problem that has been studied and identified. Coatings are frequently unnecessary and expensive, and can accelerate deterioration of the masonry. Mortar joints which do not need repointing should not be repointed. C. WINDOWS AND DOORS Window and door frames are in most cases wood. Brick structures have stone sills and brick lintels. In some cases where aluminum siding has been applied window trim has been covered. About half of the structures in the district have aluminum storm windows, the other half wood windows. Required