Cost of roofing work

A modern metal chimney can be equipped without brick external thermal insulation — its installation can be included in the total cost of roofing work. New chimney systems have been developed, consisting of two pipes of different diameters made of stainless steel. Hot gases go through a smaller pipe inserted into a steel shell. Thanks to this location of the pipes, even with intensive burning, the temperature of the external case does not exceed the safe limits.