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sandstone. This method of cleaning erodes the surface material and accelerates deterioration. 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. Usage of Portland cement can cause deterioration as a result of the differing coefficient of expansion and porosity of the historic masonry unit and the mortar. This most often results in serious damage to adjacent brick. Unpainted masonry surfaces shall not be painted unless they had been painted originally. Paint shall not be removed from masonry surfaces by any means that damage the surface. 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. Wood siding should not be power-washed. C. WINDOWS AND DOORS Window and doorframes are in most cases wood and vary depending upon the style of the home. Many are double hung windows with wood trim and sills. Brick structures have stone sills and brick lintels. In some cases where aluminum siding has been applied, the window and door trim has been covered. About half of the structures in the district have aluminum storm windows, the other-_ -_ half have wood storm windows. ------------------------- - ----- ---- -- - - - Required Original windows and doors shall be retained including sashes, lintels, sills, shutters, decorative glass, pediments, hoods, and hardware. When deteriorated beyond repair, they shall be replaced with units and trim resembling the original. Recommended Wood storm windows and doors painted or finished to match the original should be used but should not damage existing frames. If new sashes or doors are installed, the existing or original materials, design, and hardware should be used. When metal storm doors are used, they should be painted, anodized or coated to match the existing. When awnings are used they should be of canvas material. III. NEW CONSTRUCTION New construction includes any new building or structure built within the boundaries of the historic district, or any new addition to an existing building. New construction should be designed considering the appearance, scale, styles, and setbacks of the other buildings in the neighborhood. New work may be contemporary or may suggest motifs from historic buildings in the district. A. HEIGHT AND PROPORTION The majority of the structures in the district are two stories in height, and have square or rectangular plans. There are several houses that have "L" or "T" shaped or rambling ground plans. There are a few single-story cottages and one and one and a half story bungalows. The most prevalent facade proportions are: 1:1 and 1:2, height to width ratios. Required The height of a new structure and its height to width proportions shall be consistent with adjacent buildings in the district. The building height shall be no greater than that of the tallest existing structure and no less than that of the lowest existing structure in the same block. Facade proportion shall be established by permitting no structure with a facade wider or narrower than those existing in the same block. Additions to existing buildings shall be related in height and proportion to the existing structure Recommended Design of new construction should be compatible in character and mood to the building or neighborhood. Prohibited Additions that would add new height or change the existing fagade of a building and change its scale and architectural character shall not be constructed. Not Recommended New stories should not be added nor existing stories be removed which would destroy important architectural details, features, and spaces of the building. Any style or period of architecture that is incompatible with the existing should not be permitted in the new additions. B. BUILDING MATERIALS Wall materials in the district range from brick, stucco, wood clapboard and shingles, and aluminum, vinyl and fiberboard/composite siding. Required Exterior materials used on a new structure shall be compatible in scale, texture, and color (as pertains to masonry) with adjacent structures. Materials used on an addition to an existing structure shall relate to the existing or original materials of that structure. Also, as much of the original structure as possible shall be retained so that the addition could be removed without damage to the basic structure and appearance of the building. Recommended Alternative or composite siding may be used when it is the only feasible alternative. This siding should be compatible with the original size and style and with the materials of other buildings in the district. Prohibited Inappropriate materials such as asbestos, asphalt, cast stone, or artificial brick shall not be used. Not Recommended Glass blocks should not be used. Concrete block should not be used for anything other than the foundations. 7