The purpose of this study is to develop a new approach to determining the causes of deformation cracks in brick walls and light concrete blocks, which will increase the accuracy of expert research in case of disputes. In the process of theoretical research, methods of analysis and the results of field observations were used. The results of this study include a proposal to use the concept of "damage formation mechanism", which represents the relationship between the damaging factor as a consequence and the cause of its occurrence, which preceded the consequence. The classification of deformation cracks has been updated. The results of the study are of practical importance for specialists in the field of inspection of buildings and structures to determine the cause-effect relationship of the formation of deformation cracks. The expanded classification of deformation cracks has theoretical significance, since it complements the existing concepts of damage.

Keywords: cracks, deformation cracks, types of cracks, classification of cracks, causal relationship, damaging factor, mechanism of damage formation

The purpose of this study is to develop a survey methodology that allows you to determine the composition of the common property of an apartment building, which is used in the operation of non-residential premises. In the process of theoretical research, analysis methods and results of field observations were used. The results of this study are the classification of non-residential premises that are not part of the common property of an apartment building, a list of elements of an apartment building to be examined to assess their use in the operation of non-residential premises, recommendations to a specialist on the list of documents necessary for this survey. These results are of practical importance for specialists in the field of inspection of buildings and structures when resolving disputes in the practice of operating apartment buildings and non-residential premises that are not part of the common property of a residential building.

Keywords: non-residential premises, classification of non-residential premises, survey methodology, apartment building, common property, list of common property elements, composition of common property, operation, housing stock

Is calculated the mean distance between the diamond grains on grinding wheels by their characteristics. Is carried out of the duration, frequency and form of discharge impulses in electro erosion profiling of diamond grinding wheels.

Keywords: electro erosion profiling, correction, the distance between the diamond grains, frequency of discharge impulses, the duration of discharge impulses.