The article sums up the requirements for historic masonry structures whose reinforcement is based on the grouting technology application, the grouting implementation procedure in relation to the extent, type and size of masonry damage. Special focus is put on grouting agents and requirements for their characteristics.

The continuous development of nanostructure and the study of physico -chemical processes in the nanometer range lead to new methods that can slow down the degradation processes of a work of art, or even restore damage caused, for example, by an inappropriate restoration process. The use of nanosuspensions based on calcium hydroxide is probably the most widespread application of nanomaterials in heritage care, especially in the field of hardening of lime building materials (plaster, limestone, etc.). In combination with titanium dioxide, it should be a successful suspension in the fight against biological agents, surface contamination or in the protection of UVresistant building materials.

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The article presents an analysis of degradation processes and partial results of an experimental research into materials and structures exposed to the effects of external environments with an emphasis on the effects of moisture and chemical degradation processes on major mechanical properties of sandstone.

Between used and already verified technologies for the reinforcement of plasters mainly include nanosuspension containing nanoparticles of calcium hydroxide and nanomaterials based on magnesium hydroxide and barium carbonate [1]. Individual lime nanosuspension, which consists of nanoparticles of calcium hydroxide, are dispersed in an alcoholic environment and they differ from each concentration and type of alcohol. When the material is cured, carbonatation occurs, as well as in the case of fresh plaster, where the calcium hydroxide reacts with atmospheric carbon dioxide to produce calcium carbonate. Due to the deposition of calcium carbonate in the damaged material, occurs re-strengthened ties and its hardening. The undoubted advantage of the consolidation of plaster using nanolime is the low number of impregnation cycles, where after a few applications nanosuspension occurs to the reinforcement of degraded material.