These days we are using very similar or in some situations, the very same lime mortars that our forebears used with only concession to manufacture and transportation. So much so, many historic walls with modern-day plasters conceal these traditional backgrounds providing testimony to their effectiveness and longevity.
The types of lime plasters and lime mortars used during this period is a discipline in itself and therefore far too extensive to be included within this narrative, however there remains a healthy proportion of surviving examples. From the middle of the 19th century until as late as the 1920’s, earth plasters were being surpassed by a more affordable and available lime mortar substitute. Surprisingly some of these historic plasters remain effective today, both on walls and ceilings. Commonly, and particularly during the 18th and the first half of the 19th century, quicklime was added for strength, workability and to achieve a faster set. The top-coat plaster would comprise of finer clays and sands without a binder. Typically, the first coat of plaster would contain a fairly coarse sand or aggregate with animal hair, chopped straw or teased hay added to bind the material together. Early Cornish plasters consisted of sieved, clayey earth that would have been applied by hand (literally) or with a wooden float.
For hundreds of years we have applied internal plasters to the walls of our buildings for decoration, trend or consolidation of substrate purposes.
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