Masonry Magazine July 2006 Page. 39
6004
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no sheet wrap can touch
"... the pressure system for applying
water should not be the same
system for applying chemicals..."
- Jim Diedrich, Diedrich Technologies
There are at least two very diverse groups when it comes to discussing cleaning equipment for restoration, renovation and even new work clean up. On the one hand, some feel that high-pressure (2,000 and even 3,000 psi) washers are the best, while the opposite camp goes for low-pressure (50-90 with 700 maximum psi) units with special chemical solutions. Without drawing a line in the sand, here are some of those expert opinions.
"Water washing by itself with a pressure washer is going to be the most effective and efficient method of cleaning in a limited amount of time," said Matt Hoefer, equipment division manager for Mi-T-M Corp of Peosta, lowa. Mi-T-M has been making pressure washers since 1971. "Adding a solution into the system can help in certain applications, but it can also harm the product. If you're not careful when using solutions, you risk damaging the color and integrity of the masonry by washing away the sand and texture on the surface. The same is true when using too much pressure."
"We don't suggest pressured water to apply chemicals, either with mixtures or alone," retorted Jim Diedrich, president of Diedrich Technologies in Milwaukee, Wisc. Diedrich Technologies makes chemical solutions to clean old and new masonry. "It's even written in certain guidelines and specifications put out by brick manufacturers. They say that the pressure system for applying water should not be the same system
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