Masonry Magazine August 2001 Page. 18
Paint Removal
Paint removal can be one of the most difficult and frustrating parts of building restoration because of the many different types of paint and combinations that exist.
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Pressure Washing
On sonry and sand-coated brick, the nozzle pressure of the wash water may be restricted to 200 to 600 psi. In other cases, higher pressure may be possible depending on what pressure the surface can withstand. No neutralization of the surface is necessary. While pressure washing is a prerequisite in chemical cleaning, it too can be employed indiscriminately. High pressure such as 3000 to 10,000 psi, bullseye/laser tips of 00, and Rotomax oscillating nozzle attachments can do great harm to a masonry structure.
Limestone and Sandstone Cleaning
Limestone and some sandstone cleaning requires a two-step process in a majority of cases. There are other instances where the stone may have a heavy carbon crust called a black encrustation. While black encrustations are most prevalent on sandstone and limestone, they can develop on any masonry surface, most often occurring under window sills, belt courses and other areas of a building beneath an overhang condition. The process calls for an alkaline gel cleaner/black encrustation remover to be used first. Application can be by brush, roller or airless sprayer. Dwell times can be as little as one hour and up to three or four hours in instances of heavy carbon black encrustation deposits. The alkaline gel is then pressure-washed from the surface. This is followed by an application of a neutralizer, because these alkaline cleaners may leave a white alkaline residue. The neutralizers for this process normally are an acetic (vinegar concentrate), acid-based product. A saturated application of the neutralizer is allowed a 5- to 10-minute dwell time, and then is pressure-washed from the surface.
Paint Removal from Old Buildings
The removal of paint from old buildings is not unusual, be it brick, stone, concrete or wood construction. Paint removal can be one of the most difficult and frustrating parts of building restoration because of the many different types of paint and combinations that exist. For example, with buildings from the 1700's it is possible to encounter white wash, milk- and blood-based paint, lead based, oil base, latex and high acrylic content paints on one surface. This could result in the need for different products to attempt to get down to exposed masonry. It may require a methylene-chloride-based product to remove the acrylic, then a caustic-based product to remove the oil and lead-based paint.
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MASONRY AUGUST, 2001
18 MASONRY AUGUST, 2001