CLAY AND LIME PLASTER

Clay plaster

The natural colour of clay plaster is ochre red. It is compounded from clay and sand, vegetarian fibres or wooden shavings are added for reinforcement and better quality. Adding fibres or chips strengthens the plaster and avoids cracking. Clay plaster improves microclimate of rooms  balances air humidity and temperature. Clay plaster is mostly used in internal conditions. Reed mat and reed board are suitable base surfaces for the plaster, but bricks and natural stones can also be used. Clay plaster dries only by evaporation of water. 20-25mm clay plaster layer dries in 3-8 days, depending on the temperature. Cracks and flaws are easy to repair  it can be repaired by moisturising the surface.

Casein coat protects clay plaster and suits with its neutral shade. It is essential to preserve the breathing and accumulating ability of the plaster during painting. In addition to its imposing appearance and human-friendly nature, living in a clay plastered house reduces the risk of getting respiration or skin diseases. Clay plaster creates an allergy-free environment.  

Lime plaster

Lime mortar has been in use since 1200  most of the houses in the Old Town of Tallinn have been built and plastered with lime plaster. Lime plaster petrifies with carbon dioxide. Permanently petrified plaster rich in lime absorbs water well; it divides equably and dries freely out. Plaster is so flexible, that nails hammered in it, will neither crack it nor pull the plaster off the base surface. Coating wooden constructions with lime plaster makes the walls warmer and provides better protection against fire.  Lime plaster breathes, preventing rotting and dry rot in wooden buildings. In internal conditions, lime plaster cleans the air and balances humidity. Moths and rodents do not like wooden surfaces coated with lime plaster.

The thickness of lime plaster should be 25-30mm in external conditions. Traditional paints are best for lime plaster (lime paint, chalk, casein paint, egg oil tempera).