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<br />Recommended <br /> <br />Preservation <br /> <br />Not Recommended <br /> <br />Building: Exterior Features-continued <br /> <br />Wood: Clapboard, weatherboard, shingles, and other wooden siding <br /> <br />Retaining existing material, whenever possible. <br /> <br />Repairing or replacing, where necessary, deteriorated <br />material with new material that duplicates in size, <br />shape, and texture the old as closely as possible. <br /> <br />Removing architectural features such as siding, <br />cornices, brackets, window architraves, and doorway <br />pediments. These are, in most cases, an essential part <br />of a building's character and appearance that <br />illustrates the continuity of growth and change. <br /> <br />Resurfacing frame buildings with new material, which <br />is inappropriate or was unavailable when the building <br />was constructed, such as artificial stone, brick veneer, <br />asbestos or asphalt shingles, and plastic or aluminum <br />siding. Such material can also contribute to the <br />deterioration of the structure from moisture and <br />insects. <br /> <br />Architectural Metals: Cast iron, steel, pressed tin, aluminum, zinc <br /> <br />Cleaning, when necessary, with the appropriate <br />method. Cast iron and steel are usually not affected by <br />mechanical cleaning methods while pressed tin, zinc, <br />and aluminum should be cleaned by the gentlest <br />method possible. <br /> <br />Removing architectural features that are an essential <br />part of a building's character and appearance and thus <br />illustrate the continuity of growth and change. <br /> <br />Exposing metals that were intended to be protected <br />from the environment. Do not use cleaning methods <br />that alter the color or texture of the metal. <br /> <br />Roofs and Roofing <br /> <br />Preserving the existing roof shape. <br /> <br />Retaining the existing roofing material, whenever <br />possible. <br /> <br />Replacing deteriorated roof coverings with new <br />material that matches the old in composition, size, <br />shape, color, and texture. <br /> <br />Applying new roofing material that is inappropriate to <br />the style and period of the building and neighborhood. <br /> <br />Replacing deteriorated roof coverings with new <br />materials that differ to such an extent from the old in <br />composition, size, shape, color, and texture that the <br />appearance of the building is altered. <br /> <br />21 <br />