Modern facade finishing systems based on lime plasters

The objective of the article is to identify effective material systems based on lime binders for finishing the facades of brick buildings. The research task was to determine the degree of influence of the type of leveling layer and the finish coating on water vapor permeability and surface water absorption, which directly or indirectly define the operational characteristics of the finish and enclosing structures. Three-layer plastering systems were studied, including a plaster base coat, a leveling or putty composition, and a mineral paint. An experimental comparative assessment of finishing systems differing in their finishing smoothing methods and paint types was carried out in terms of vapor permeability and surface absorption capacity of the finish. Vapor permeability was determined by a standard method, and surface absorption capacity was measured using graduated glass tubes (Karsten tubes). It was shown that using putty layers instead of fine-grained leveling plasters leads to reduced vapor permeability and slows moisture migration through the finish layers. This creates a risk of increased moisture content and, consequently, reduced energy efficiency of the enclosing structures. It was found that hydrophobization of the paint layer does not significantly affect vapor permeability. However, it substantially reduces surface absorption capacity, which can be utilized in finishing systems intended for operation under high atmospheric humidity conditions. The results of these studies form the basis for developing scientifically grounded recommendations for selecting finishing material systems that ensure the required maintenance-free service life of brick facade finishes, as well as maintaining moisture levels in the enclosing structures within permissible operational values.