One of the most difficult problems that can arise as a
result of deciding to clean a structure is deciding where
to stop.
By cleaning the upper part of this bridge only
the impression has been created that a totally different
stone was used for the...
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One of the most difficult problems that can arise as a
result of deciding to clean a structure is deciding where
to stop.
By cleaning the upper part of this bridge only
the impression has been created that a totally different
stone was used for the treated part.
In reality the
material has been bleached and discoloured by the
chemical used.
Understanding the soiling of buildings
is critical if cleaning is proposed.
Sandstones are particularly difficult to
comprehend as soiling can often occur
from within the stone, resulting in a
variegated appearance at the surface.
Where the depth of soiling only
extends to a few microns in thickness
on the surface, the use of high
pressure grit blast cleaning, whether
wet or dry, can bite deeply into the
historic surface below, destroying the
quality of the original banker mason s
workmanship.
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Stone Cleaning
Ingval Maxwell
The need to clean a building is commonly perceive
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