The need of quality materials for thermal insulation and restoration of building constructions is without question an up-to-date subject. Considering the growing trend in the field of reduction of building construction energy intensity and reduction of CO2 production a general assumption at development of new thermal insulating plasters is the reduction of thermal conductivity and also reduction of density in mature conditions which results in general saving of raw materials necessary for production of 1m3 of applied plaster. Aim of the paper is to acquaint readers with results of research and development of "advanced" thermal insulating plasters obtained within the cooperation of Brno Technology University and Vienna Technical University. Main object of research works was a development of plasters that would show a very good ratio of thermal insulating and mechanical properties, low density, high durability and resistance to humidity and salt influences mainly in case of its possible applications within reconstructions of existing building objects with higher moisture content.

The article describes the results of research work carried out in cooperation between the Faculty of Civil Engineering in Brno and the Faculty of Civil Engineering in Vienna concerning the development and study of the behaviour of heat-insulation plasters on a silicate basis, in particular in the area of the transfer of heat and moisture in their structures. The main objective was to determine the capillary activity of the thermal moisture behaviour of the developed materials which can be source material for the further part of the research solution addressing the simulation of the behaviour of these thermal-insulating plasters in real constructions.

Production of building materials is mostly energy consuming. In the sphere of insulation materials we mostly see rock wool based materials or foam-plastic materials whose production process is demanding from material aspect and raw materials aspect as well. At present the demand for thermal insulation materials has been growing globally. The thermal insulation materials form integral part of all constructions in civil engineering. The materials mainly fulfill the thermal insulating functions and also the sound-insulating one. The majority of thermal insulation materials are able to fulfill both of the functions simultaneously. The paper describes questions of thermal insulation materials development with good sound properties based on natural fibres that represent a quickly renewable source of raw materials coming from agriculture. The main advantage of the materials are mainly the local availability and simple renewability of the raw materials. In addition an easy recycling of the materials after their service life end in the building construction and last but not least also the connection of human friendly properties of organic materials with advanced product manufacture qualities of modern insulation materials.