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BECAUSE OF ITS UNDEFINED SHAPE <br />• Stone, rubble refers to a type of stone <br />which has an undefined shape. The <br />uneven face of stone rubble and <br />uneven size of the pieces provides a <br />unique texture that is not found in <br />other materials, <br />• Cut stone is a precisely shaped <br />stone, a smooth or rusticated (rough) <br />face. It is frequently used as a <br />decorative element on buildings or as <br />a way to accent an opening. Cut <br />stone can also have a great amount <br />of detail such, as on columns and <br />capitals. <br />• Stone walls are constructed with <br />mortar in the same way brick walls <br />are. The mortar must not be harder <br />than the stone. Portland cement <br />mortar can cause damage to stone <br />walls. <br />Cleaning of Stone <br />• Do not sandblast, use abrasive <br />methods or high pressure water <br />sprays to clean stone masonry. <br />• Chemical cleaning may be required <br />for difficult stains or graffiti, but such <br />cleaning must be prescribed or <br />conducted by a knowledgeable <br />professional. Great care must be <br />given if a chemical cleaning solution <br />is to be used. Some chemicals burn <br />the face of stone., <br />• Water washing is the gentlest method <br />of cleaning simple dirt and grime from <br />stone masonry surfaces. <br />• Prior to, any water washing methods, <br />make, certain that alll mortar joints are <br />sound and that the building is <br />watertight. This will decrease the <br />likelihood of water reaching metal <br />anchors or interior walls. <br />Design Standards for the City of Paris, Texas 65 <br />