Abstract: Dedicated to the development of methods and microprocessor measuring systems for non-destructive testing of thermophysical properties of building materials and finished products . Physico-mathematical models of temperature fields in the studied objects with contact and contactless thermal exposure from heat sources of various geometric shapes, adequately describing the thermal processes in controlled materials and products, are presented. Methods of complex determination of thermophysical characteristics of building materials and products by the method of non-destructive testing are proposed . Particular attention is paid to new contact and non-contact methods of non-destructive testing of heat-protective properties and technical diagnostics of multilayer building structures and products. The original microwave methods of non-destructive testing of heat-protective properties of building materials and products using microwave radiation energy for heating are presented. The analysis of errors in the results of measurements of the developed methods and the measuring systems implementing them is given. Designed for scientific, engineering and technical workers, university teachers, graduate students, students .