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COMMERCIAL BUILDING MATERIALS <br />If stone shows evidence, of dirt and <br />grime, it can be cleaned with a mild' <br />solution of soap and water and a stiff <br />brush of either natural or synthetic <br />bristles. Never use a metal -bristled <br />brush. <br />As with brick masonry, cleaning must <br />start at the, bottom of the building and <br />progress upwards, keeping the lower <br />levels wet or frequently rinsed. <br />Repair of Stone Masonry <br />• The material between the stone, <br />mortar, is important to the integrity of <br />the wall!. <br />• Before replacing missing or damaged <br />mortar (repointing), determine any <br />other causes for the deterioration of <br />the mortar or stone wall: leaking roofs <br />or gutters, building settlement, or <br />extreme weather exposure. This will: <br />ensure that the new mortar is not <br />subjected to the original sources of <br />deterioration., <br />If the mortar is simply missing or <br />deteriorated, it must be replaced' with <br />mortar to match the original in color, <br />composition, and profile. <br />Use a sand -lime recipe for mortar, <br />which is compatible with the old <br />stone. Modern, masonry mortar has <br />Portland cement as a main <br />ingredient, which cures considerably <br />harder than the stone. This can lead <br />to cracking or other damage to the <br />stone and may cause water to enter <br />the wall. A preservation professional <br />can determine an appropriate mortar. <br />® Missing or severely damaged stone <br />must be replaced with stone matching <br />the original in material and <br />dimensions. <br />® If stone is structurally soundi, stone <br />patch may be utilized or a dutchman <br />may be cut and iinstalled. <br />Design Standards for the City of Paris, Texas 66 <br />