The influence of lime-perlite plaster coatings on the moisture regime of building envelopes

This study investigates the influence of plaster coating based on a developed dry mix containing synthesized aluminosilicates on the thermal and moisture regime of building envelopes under various operating conditions in the cities of Novosibirsk and Penza. Two finishing options were analyzed during the calculations: the first used a lime-sand mortar with a density of 1.600 kg/m3 for finishing both interior and exterior surfaces, while the second used the same mortar for the interior finishing but employed a plaster mix with a density of 700 kg/m3 based on the developed formulation for the exterior. The results obtained suggested that the developed thermal insulation plaster was effective in the climatic conditions of both cities. It ensured faster drying of the wall structure compared to cement-sand mortars, and a 1.6–3 mm shift of the zero isotherm towards lower temperatures was observed. Furthermore, using the plaster based on the developed formulation reduced the amount of condensation within the wall structure by a factor of 19.4 in Novosibirsk and almost completely eliminated it in Penza. The moisture content of the material was 4.7 times lower in Novosibirsk and 3.2 times lower in Penza compared to lime-sand analogues. This indicates an increase in the thermal insulation properties of the external building envelope.