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We specialise
in using a low pressure sand jetting system that has been used nationwide for
property restoration, including gaining approval for and subsequently working
on many Listed Buildings. The system, in our trained hands, causes minimal damage to an underlying
surface and is flexible enough to tackle most property restoration cleaning
tasks. The low pressure sand jet can clean stone without
injecting large quantities of water into the surface, and with
minimal surface damage, at the same time, the
'wet' system also captures dirt and abrasive, preventing the health
and safety risks associated with dry blasting.
That being so, there are times when chemical
stripping is needed. It can be considerably cleaner to use than abrasive
cleaning, although generally the stripping solvents return paint to its liquid
state, and therefore reintroduce the mess potential of paint. In general
this is the technique to use for minimal surface damage. However, pressure
washing is the most cost effective method for chemical and paint removal, some
pointing etc may be lost.
Paint stripping by chemical is much slower
than abrasive cleaning, but conversely, in general, less labour intensive. The
chemical is generally applied on one day, and washed off the next, but
multiple applications of chemical may be required. A further datasheet is
available here
Subsequent cleaning with the sand jet can
remove the final remains of paint..
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Test Patches on a House in
York, the top patch is sand jetting, the bottom a single
application of chemical stripper. The sand jet has been more
effective for one pass, but the chemical is causing less damage
to the brick. |
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A set of photographs of a trial in a
Listed Building cleaned in January 2005. |
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Napier's SARA stripping
solution applied to the test patches, paint on bricks, on tiles
& on glass (windows). Close up it
looks as though someone has sneezed over a building. The
chemical is environmentally friendly, is deactivated by water
and is cleaned off with a pressure washer, however sheeting is
placed on the ground to capture bulk paint and chemical debris. |
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After 24 hours this is what it looked like |
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After the first pass with
chemical, the paint on the glass and tiles has stripped off in
one application (revealing that the windows are painted on the
outside too!) while the layers of paint on the right hand side
have separated, and a second application of chemical will be
required. |
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 | Effective on a wide range of paints, but a trial
needs to be done first to confirm effectiveness! |
| Chemicals used are environmentally friendly and are
deactivated by water |
| Definitely the method to use on softwood surfaces |
| Very effective at cleaning paint from metal surfaces
- although as no surface profile is formed, not suitable on its own for
surface preparation for cold galvanising. |
| Excellent for graffiti removal from glass, plastic or
wood where sand jet would cause damage, |
| Cleaning to the requirements of BS 8221-1&2 :2000 the British Standard Code of Practice for Cleaning and Surface repair of buildings. |
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