The overall objective is to provide a well-founded body of knowledge and practical experience of Linostone removal that will enable practitioners to make the right decisions when treating buildings that have had Linostone applied in the past.
The first stage of the project is to characterise the coatings identified as 'Linostone' (crushed stone in a bitumen or resin-based carrier) in past and present practice. The second stage is to assess existing methods of Linostone removal and to establish by analysis and experiment, the best methods to use. A case study will be some of the tenement buildings on Bernard Terrace, Edinburgh (map) which are soon to have their failing Linostone removed. Optimum removal strategies will be those that do not cause additional damage to the stone substrate and do not leave harmful residues that might interfere with subsequent conservation and repair procedures. It is expected therefore that actual removal strategies will depend on the nature of the stone, its present state of decay and on the intended post-Linostone-removal repair strategy- e.g. indenting, dressing back, cleaning or none of these.
The methods of study to be employed will be: a)observation of in-situ 'Linostone' applications on existing buildings; b)petrographic, scanning electron microscope and chemical characterisation of 'Linostone' and its interaction with stone substrates, using material recovered from buildings as well as experimental test-pieces. In the second phase, to investigate removal techniques, I aim to gather information from practitioners and set up experiments. Collaboration with selected practitioners is envisaged.