Masonry Magazine July 2010 Page. 25
The surface to be cleaned could be new construction, or it could be old construction, in which case one would need to account for the varying levels of weathering and erosion the surface has already experienced. The material could be stone, brick or concrete. Masons should take these types of factors into consideration when identifying the proper combination of elements for their cleaning applications.
Some considerations are fairly universal to any masonry-cleaning job. For instance, the surface to be cleaned should always be inspected for cracks, and any cracks located should be patched and allowed to dry for several days before pressure washing. If cracks are not repaired, the pressure washer could easily end up pushing water and chemical behind or below the surface, potentially causing far more long-term harm than short-term good.
Once ready to perform the cleaning, make the appropriate adjustments to the pressure washer to suit the specific application. Again, many different factors will come into play, but as a general rule, masons will want to use higher pressures for concrete and slightly lower pressures for brickwork and natural stone. The nozzle tip is another variable to consider. Many experts recommend using a tip that provides a wider spray pattern, since a narrow-angled spray could potentially damage the masonry surface, as well as mortar joints.
Regardless of the particular settings and accessories, a quick test run is the best way to ensure the chosen solution actually will work without causing any adverse effects. Start the test run by keeping a safe distance from the surface to be cleaned until determining you can or should move closer to properly clean the surface.
Following the use of any chemicals, it's wise to complete the job by rinsing away remaining suds or residue from the surface. And, even if no chemicals are used, it's still a good idea to go over the surface a second or third time to wash any remaining particles or debris. Keep in mind throughout the process that pressure washing really is a science. If you don't know the best course of action to take, consult an expert. IMAS
Dan Leiss is president of Steam Jenny, a product division of Jenny Products Inc.
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READER SERVICE #177
July 2010
MASONRY 23