Abstract This paper examines the role of mortars and plasters in the construction process during the Roman period and seeks to elucidate the chaîne opératoire from the production of the main ingredients — lime and aggregate — to their application in structures, based on archaeological, visual and archaeometric data. As well as looking at the actual processes involved, it also considers the functional requirements of the mortars and plasters and the economic implications of their use, especially the nature and cost of transport, which may have led to particular choices being made by Roman builders; it also considers the supply of materials in terms of the logistics of construction. The emphasis is on mortared rubble construction, which was a particular development of the Roman period from the second century BCE and required much larger quantities of lime than previous building techniques. Attention is also paid to the human actions involved and the tools employed.
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