According to Housing and sound insulation, Improving existing attached dwellings and designing for conversions, prepared by the Scottish Building Standards Agency, Historic Scotland and Communities Scotland, and published in 2006, the term 'boss plaster ', refers to plaster that has lost its adhesion to the wall surface it was applied to.
This can occur when old plaster loses its strength and adhesive bond. This may result in cracking, or bulging, and when the surface is ‘tapped’, it may sound hollow (boss) and will probably need to be removed and a new coating applied.
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