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Explanation: Something of an educated guess. 'Plinth' is a pretty safe bet in the context, and I found a fairly good contextual reference here:
Dryvit ACR, an acrylic based anti-crack render, was also used alongside the Outsulation system to create an inverted plinth effect. Some 1200 metres square of the two systems were installed in all. http://inca-ltd.org.uk/case-study-7.htm
Languageman United Kingdom Local time: 12:26 Works in field Native speaker of: English PRO pts in category: 34