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The use of natural building materials is consistent with the principles of sustainable development in the building sector. One of the natural and unprocessed materials used in construction is clay. This raw material is used in a natural form as a binder in plasters, mortars and in composites based on organic fillers. In order to improve the thermal insulation properties of building partition, lightweight aggregates such as expanded perlite, expanded clay or foam glass are often used instead of sand aggregates in mortars and plasters. The disadvantage of clay is the lack of resistance to water, which limits the use of clay plasters from the outside of external walls. The water resistances to water can be improved by using appropriate additives or admixtures. The article presents the research results and analysis of physical properties of clay mortars based on insulating aggregate granulated foam glass). The effect of the aggregate fraction on apparent density, thermal conductivity of mortars was investigated. The influence of the use of additives and admixtures casein and linseed oil varnish) on the resistance of clay mortars to water using the washing test and weight loss after immersion in water was also evaluated.
