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<br />Recommended <br /> <br />Stabilization <br /> <br />Not Recommended <br /> <br />Building: Exterior Features-continued <br /> <br />I, <br />I <br /> <br />Retaining original material, whenever possible. <br /> <br />Architectural Metals: Cast iron, steel, pressed tin, aluminum, zinc <br /> <br />Cleaning, when necessary, with the appropriate <br />method to prevent deterioration leading to structural <br />failure. 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 originally intended to be protected <br />from the environment and thus encouraging struc- <br />tural failure. Do not use cleaning methods that alter <br />the color or texture of the metal. <br /> <br />Roofs and Roofing <br /> <br />Preserving the original roof shape when introducing <br />structural reinforcement. <br /> <br />Retaining the original roofing material, whenever <br />possible, when reestablishing structural stability. <br /> <br />Replacing deteriorated roof coverings with new <br />material that matches the old in composition, size, <br />shape, color, and texture after reestablishing the <br />structural stability of the roof. <br /> <br />Changing the original roof shape or adding features <br />inappropriate to the essential character of the roof as a <br />part of reestablishing structural stability. <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, after the roof has <br />been stabilized. <br /> <br />Windows and Doors <br /> <br />Retaining existing window and door openings <br />including window sash, glass, lintels, sills, architraves, <br />shutters, doors, pediments, hoods, steps, and all <br />hardware that may be affected in reestablishing <br />structural stability. <br /> <br />Duplicating the material, design, and the hardware of <br />the older window sash and doors if new sash and <br />doors are required after structural repairs are <br />completed. <br /> <br />Using inappropriate new windows or doors such as <br />aluminum storm and screen window combinations <br />when the removal of original windows and doors is <br />required as a part of reestabilshing the structural <br />stability of the wall. <br /> <br />15 <br />