BRICK AND STONE CLEANING METHODS are usually divided into three groups: water; chemical; and abrasive or mechanical. The selection of a cleaning technique is best when testing several methods. The tests normally should begin with water washing and then move up to harsher methods only if the simpler ones do not produce satisfactory results.
• WATER CLEANING Cleaning masonry with water is the simplest operation, the safest for the building and the environment, and the least expensive. The most commonly used water cleaning methods, from the simplest to the most complicated, are handscrubbing, spraying, pressure washing, and steaming. They are particularly effective on calcerous (calcium-based) materials such as limestone and marble and on some lime-based bricks. Water cleaning can cause some problems. Water can seep through faulty seals around wall openings. Within the wall, excess water can cause corrosion of metal elements.
• CHEMICAL CLEANING The main types of chemicals used for cleaning masonry are acids, alkalies, and organic compounds. Acidic cleaners are used for cleaning most granites, sandstones, and all noncalcerous stones and unglazed bricks. The acid loosens the dirt, which then can be rinsed off easily. Alkalies (caustics) can be used on acid-sensitive masonry materials such as limestone or marble, glazed brick, and glazed terra-cotta.
• ABRASIVE CLEANING Abrasive or mechanical cleaning techniques, such as sandblasting, are not acceptable cleaning methods for old and historic masonry. You should consult an expert in the field prior to deciding which method will work best for your construction.
Our Masonry And Stone Contractor Services Include: • Free Estimates • Competitive Pricing • Quality And Skilled Masonry Workmanship