Protection, Cleaning, and Maintenance of Stone
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It is recommended that all exposed stone paving surfaces and facing surfaces (minimum 8 feet high above ground level) be protected with Homosote, or non-staining plywood. 2 Removal of excess mortar, dust and dirt from the exterior stone shall begin at the top, and be worked down. Stone cladding shall be thoroughly washed down using clean water and fiber brushes. Stonework with accumulated dirt or substantial damage from industrial air pollution may be cleaned by an approved cleaning process employing properly pressurized steam and water. For removal of particular oil or grease stains, organic stains, rust, or other miscellaneous stains, seek the advice of a qualified experienced stone restoration firm. It is recommended that all exterior exposed natural building stone surfaces be washed down once every five years. It is recommended that you contact Building Stone Institute (BSI) for names of qualified firms experienced in cleaning exterior stone. During washdown, pointed or caulked joints which may be damaged shall be raked and repainted or recaulked. 3 Cleaning and maintenance of marble and limestone require different preparation than granite. To prevent injury to marble or limestone, avoid the use of solutions containing salts. Generally clean water is all that is needed. However, from time to time, when such treatment does not leave a clean and fresh looking surface, a mild detergent and rinsing may be used. 4 A periodic inspection and maintenance program can prevent expensive renovation work or potential removal and replacement of stone slabs. The findings of every inspection should be recorded so that any progress in deterioration can be measured and evaluated. Particular attention should be given to stone joints, lips between stone panels, cracks or spalls. |
