And now to the evils of the power washer!
While we have nothing against Karcher products, or people offering pressure washer services, there is a time and place for everything. Power washers do certainly have their place, but not when it comes to cleaning red brick facades, or any type of marble, stone, façade or patio. They should definitely not be used on any type of modern render, such as Monocouche or Techcrete. These thin renders cannot withstand any pressure and will crumble.
Pressure washing means more water – the higher the pressure, the more water you are using. So, from an environmental point of view this is not a good idea.
Apart from the harmful effects pressure washing has on the environment, the saturation of your stone and brick with water can have a detrimental effect. The pressure removes the patina, or natural waterproof coating, of your stone. This allows for the further ingress of water, which causes major headaches down the line: staining and freeze/thaw problems as referred to above. Read more on Brick cleaning services
Power washers are effective on hard non- porous materials
There are certain situations where pressure washing is useful and produces great results. Granite paving, for example.
Pressure washing is also useful for removing paint from stainless steel. We use pressure washers for cleaning streets, where the amount of lose contamination means that high volumes of water are necessary.
These are, however, the only situations where we would use our pressure washers. They aren’t suitable for the masonry and façade cleaning we carry out.