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Stone Cleaning

As an owner of a stone building you are faced with a dilemma - to clean or not to clean. If you don't clean your stonework, your building will continue to look unkempt and could even be damaged by the mosses, lichens, bird lime and pollutants that have accumulated over the years.

On the other hand, if you do have your stone cleaned, you will want to know that it is being done properly using environmentally sound and appropriate methods. At one time, the use of abrasive discs, aggressive chemicals, high pressure washing and grit blasting (sand blasting) were the only options.  These methods have caused incalculable damage to the stone buildings of the UK.

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Stone Cleaning using Soda Blasting

Towards the end of the 20th century, vortex stone cleaning systems were developed - you may have heard of them as the JOS and TORC systems. These use a swirling vortex of low pressure water with a light abrasive content to gently remove the surface contamination.

But now there is soda blasting, which is one of our preferred stone cleaning techniques. Using a vortex of compressed air to carry specially graded sodium bicarbonate crystals, soda blasting will remove:

  • lime & cement based paints
  • paint residues
  • some old oil based paints
  • carbon and bitumen
  • lime scale
  • micro-organism blooms
  • bird fouling

and many other types of surface contamination. Soda blasting does not damage the substrate and is completely environmentally friendly.

APT are the leading Soda Blasting contractor in the UK, call us on 01495 308 048 for further information.

Stone Cleaning using the APT 'Hot Box' Method

During the early 1990s, the DOFF steam cleaning system for stonework was developed. This is a low pressure and high temperature steam system that has many advantages, four of the most important being:

  • quick drying as the steam is superheated and the low volumes of water needed to create the steam leaves very little water on the surface
  • can be used in all seasons as it operates at low pressures so no water droplets are forced into the stonework's pores and flaws reducing the chances of freeze-thaw damage
  • low surface pressure prevents damage to soft stonework
  • high temperatures kill the spores of mosses and algae meaning that no chemical inhibitors need to be used either before or after cleaning to retard re-growth

APT improved on the already very efficient DOFF system with our 'Hot Box'. It was designed by our site operatives working with engineers and it has the best attributes of the DOFF cleaning system but uses added higher steam values, has extra control and a more consistent delivery of steam over longer hose runs. It is efficient and cuts down on labour costs making it is a more cost-effective option for our clients.

Stress Free Stone Cleaning Services ...

Contact APT stone cleaning services now on 01495 308 048 for a no-obligation chat about how we can benefit your project. We will provide everything required to minimise disruption and inconvenience to your daily routine, including 'out-of-hours' working where necessary. We carry out a full risk assessment and ensure that the project conforms to Health and Safety regulations. We follow a strict environmental policy that covers all aspects of your cleaning project from the chemicals we use to the disposal of packaging.

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