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<br />Stabilization <br /> <br />Recommended <br /> <br />Not Recommended <br /> <br />i <br />I <br />I <br />I <br />, <br /> <br />Building: Exterior Features <br /> <br />Masonry: Adobe, brick, stone, terra cotta, concrete, stucco, and mortar-continued <br /> <br />Cleaning masonry only when necessary to stabilize <br />the brickwork by halting deterioration. Always use the <br />gentlest method possible, such as low pressure water <br />and soft natural bristle brushes. * <br /> <br />Repairing deteriorated material with new material that <br />duplicates the old as closely as possible. <br /> <br />Retaining the original or early color and texture of <br />masonry surfaces, wherever possible. Brick or stone <br />surfaces may have been painted or whitewashed for <br />practical and aesthetic reasons. <br /> <br />Sandblasting brick or stone surfaces; this method of <br />cleaning should never be considered when the <br />objective is the stabilization of a masonry surface. <br />Sandblasting erodes the surface of the material and <br />accelerates deterioration. <br /> <br />Using chemical products that could have an adverse <br />chemical reaction with the masonry materials, i.e., <br />acid on limestone or marble. <br /> <br />Using visible new material, which is inappropriate or <br />was unavailable when the building was constructed, <br />such as artificial brick siding, artificial cast stone, or <br />brick veneer. <br /> <br />Removing paint from masonry surfaces indiscrim- <br />inately. This may subject the building to damage and <br />change its historical appearance. <br /> <br />Wood: Clapboard, weatherboard, shingles, and other wooden siding <br /> <br />Retaining original material, whenever possible. <br /> <br />Repairing or replacing, when necessary, to reestablish <br />structural stability of deteriorated material with new <br />material that duplicates in size, shape, texture, and <br />appearance of the old. <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 and eventual structural failure of <br />building material resulting from moisture and insects. <br /> <br />*For more information consult Preservation Briefs: 1, "The Cleaning and Waterproof Coating of Masonry Buildings" and Preservation Briefs: 2, <br />"Repainting Mortar Joints in Historic Brick Buildings." Both are available from Technical Preservation Services Division, Heritage Conservation <br />and Recreation Service, Washington, D.C. 20243. <br /> <br />14 <br />