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finished in vinyl siding. The addition of frieze and corner boards and trim around doors is an effort to reintroduce architectural detail into areas where the original version of this house may have had them. Additional work is expected to occur under Routine Maintenance Exclusion, ie: removing mastic siding up to reveal brick foundation, repointing and sealing. STANDARDS AND GUIDELINES: II. EXISTING STRUCTURES A. BUILDING MATERIALS Wall materials in the District range from brick, clapboard, decorative shingles and asphalt and asbestos siding to aluminum siding. In the majority of cases the aluminum siding has been applied over the original clapboard. Required Original exterior building materials shall be retained. Deterioration of wood materials shall be pre- vented 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 structures shall be maintained, repointed and properly cleaned when necessary. Masonry shall be cleaned only when necessary to halt deterioration or to remove stains and shall be done with the gentlest method possible, such as low pressure water and soft natural bristle brushes. No chemicals, sandblasting or other invasive methods may be used to clean historic buildings. Stucco surfaces shall be maintained by cleaning and repainting when necessary. When repairing stucco, a stucco mixture shall be used. Recommended Whenever possible, the original building materials should be restored. Aluminum or vinyl siding may be used when it is the only feasible alternative to maintaining the original surface material. When used on wood surfaces, this siding should be the same size and style as the original wood. However, it must be noted that such material can contribute to the deterioration of the structure from moisture and 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 contact the Historic Preservation Commission of South Bend & St. Joseph County at 125 Lafayette, 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 or stucco. This method of cleaning erodes the surface material and accelerates deterioration. Not Recommended Waterproof or water repellent coatings or surface consolidation treatments should not be used unless required to solve a specific problem that has been studied and identified. Coatings are frequently unnecessary, expensive and can accelerate deterioration of the masonry. Mortar joints which do not need repointing should not be. Repointing should not be done with mortar of high Portland cement content, which can often create a bond that is stronger than the building materials. This can cause deterioration as a result of differing coefficient of expansion and the differing porosity of the material and the mortar because they can cause serious damage to adjacent brick. Paint should not be removed from masonry surfaces indiscriminately. B. ROOFS AND ROOFING Roof shapes in the district include hip and gable types. All are covered with asphalt shingles. Eaves, in most cases, have wood fascias with gutters and downspouts. Some aluminum -sided houses have aluminum -covered fascias. Required The existing shape and materials of the roof shall be retained. All architectural features which give the roof its essential character shall be retained, including dormer windows, cupolas, cornices, brackets, chimneys, cresting and weather vanes. Recommended Whenever possible, the original shape and materials of the roof should be restored. Particular effort should be made to retain unique materials not commonly found in new construction. Roof covering which is deteriorated beyond repair should be replaced with new material that matches as closely as possible the existing or original in composition, size, shape, color and texture. Prohibited