There is compelling evidence that modern gypsum plasters encourage condensation and consequent mould growth if used on walls that are supposed to ‘breathe’. Furthermore, lime plasters have a more elegant aesthetic, which is appropriate for many old buildings.
Lime plasters are applied in three coats to both masonry substrate and lath: scratch coat, float coat and finish coat.
Though the use of lime putty (calcium hydroxide) is now used for all three coats, there is compelling evidence that this is incorrect. Research suggests that traditionally all but the finish coats were hot mixed and, in many cases, applied hot.
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