ABSTRACT
This chapter examines methods and materials which have been successfully trialed by Historic Scotland in 15 site trials. It demonstrates the range of options which exist for retrofitting traditionally constructed masonry in a way which will ensure the long term health of the building. The walls which were tested incorporated a wide range of construction types all of which could be considered under the general heading of traditionally constructed mass masonry. Traditionally constructed, solid brick or stone masonry buildings account for a significant proportion of the world's building stock, up to 30% in some parts of Europe. In order to maintain moisture movement, natural materials such as cellulose, hemp or wood fiber board are often the most appropriate. The vast majority of buildings built prior to the twentieth century are constructed of what may be termed mass masonry. One of the most significant properties of traditionally built mass masonry is that the entire construction has an element of vapour permeability.
