When writing the book, the authors used all the current regulatory and instructional materials, and examples illustrating the recommended solutions for structures, as a rule, were selected from standard designs. However, the authors did not always adhere to the current guidelines and model projects. Trying to express the main idea of ​ ​ the solution more clearly, in the book in many cases the authors gave examples other than typical ones. In the latter case, if the material does not represent the author's own experience, a reference to the literary source is given.