This research presents a methodology for classifying construction objects with critical defects. The presented work is part of a larger research effort dedicated to a comprehensive systemic approach to solving the problem of restoring various types of housing and social infrastructure objects damaged by different types of events. The paper discusses an algorithm for classifying construction objects with critical defects, introduces the concept of "degree of defect criticality", proposes a hypothesis about quantitative values of defect criticality degree intervals, and describes the classification algorithm. The presented examples demonstrate a holistic systemic approach to solving the scientific problem of restoring damaged objects affected by various types of events such as fires, explosions, impacts, and floods. Research methods employed include synthesis and scientific analysis, data collection, statistical analysis, as well as destructive and non-destructive testing methods at different stages of the study. Conclusions and tasks for further research are formulated.

Keywords: critical defect, degree of criticality of defects, construction object, organizational structure, organizational and technological solutions, technical condition

The purpose of this work is to develop a list of possible categories of the need for major repairs and appropriate criteria for evaluating structural elements and in-house engineering systems. In the process of working on this study, methods of statistical data collection and expert evaluation were applied. As a result of this study, a table of the Category of the need for major repairs of apartment buildings, Criteria for assessing the need for major repairs of apartment buildings, was also presented by the algorithm of actions of a specialist in determining the need for major repairs of apartment buildings. This work is an effective and relevant method for determining the need for major repairs of apartment buildings in comparison with VSN 53-86(p) "Rules for assessing the physical wear of residential buildings".

Keywords: major repairs, apartment building, expert evaluation method, operational reliability, category, criterion

The analysis of the technological processes of building materials and wood products as a source of the harmful emissions into the air of the working area. The results of field studies to assess the ambient air dust in the workplace areas of mechanical wood processing. Recommendations on the use of optimal solutions to reduce particulate air pollution in the working area of woodworking industry.

Keywords: wood dust, general exchange ventilation, aspiration, individual dedusting unit, maximum allowable concentration