The paper is trying to present the problem of renovation of chimney flue which are defective due to the accumulated soot. The problem of increasing dirtiness and damages of chimney walls were presented. Accumulated soot in the chimney flue can result In the damages of chimney Walls, or the structures of the buildings or even cause the fire. The main aim of that particular publication is to draw attention to the problem of accumulated soot. It is very difficult to remove the soot. In many cases it is only possible to remove the soot using burning method. The paper also portrays the reasons of creation of dirtiness and damage of chimney walls. In extremely bad conditions of the chimney flue, it can lead to carbon monoxide poisoning.