In the middle ages the need for stonemasons to identify their own work began a tradition of masons’ marks incised, often discretely, into the stonework of their buildings. These provide us with an insight into the building methods of the time, where the skill of a particular crafts-man can be identified as an early form of quality control.

Whilst such examples are deemed to have historic value and should be protected, the regrettable modern practice of graffiti is generally regarded as more akin to vandalism. Modern day graffiti can be the work of an individual or often, a well organised group, and can occasionally be of considerable artistic merit. However, there is a growing level of concern amongst building owners and practitioners over the sometimes, irreversible damage caused to the substrate on which the images are applied.

This Technical Advice Note combines the results of an unpublished scientific research study by the Building Research Establishment with the pragmatic experience of the Historic Scotland Conservation Centre’s stone conservators when dealing with graffiti. By concentrating on a range of typical building materials it aims to offer best advice to practitioners when faced with this issue. The ready availability of a whole range of paints and inks of advanced specification, and the wide variety of methods of applying them to building surfaces means that decisions on their removal must be carefully considered and guided by informed advice.

Due acknowledgement must be given to Stephen Gordon and the Historic Scotland staff for the source material for the text. Advice on practical problems stem directly from their experience of treating graffiti on the most sensitive of historic sites across the country. Ably supported by the work of Tim Yates and his team at BRE, the combined understanding offers a realistic insight into the effective treatment of this widespread problem.

Utilising his exemplary technical skills and knowledge of building materials, Dennis Urquhart has integrated these areas of research with his own experience of the treatment of masonry and other materials. Sections on graffiti policy, planning considerations, alternative strategies and other essential factors have been added. The result is a pragmatic document which will be of value to all those concerned with this modern-day Issue.

David J Breeze, Chief Inspector Ancient Monuments and Ingval Maxwell, Director TCRE