It probably goes without saying that the type of chimney structure, its integrity and cleanliness are the determining factors for the high-quality and reliable operation of the entire chimney structure. Therefore, timely prevention must be mandatory; it will help delay chimney repairs and protect it from destruction. But, when you still haven’t noticed the condition of the channel, you need to take several “steps” before the main work, carry out preparatory work, preparing the pipe for repair.
Restoring brick households in particular is considered the most problematic. Considering the dimensions themselves, as well as the nature of possible malfunctions, you may need help. What to do first:
- Determine the extent of the problem, what exactly is faulty, perhaps the masonry has been damaged or cracks have appeared.
- Clean the entire area to identify hidden defects.
- Determine the scope of the work and how difficult it is to complete it yourself.
Basic malfunctions of brick chimneys and ways to eliminate them
Repairing your brick chimney involves several problems:
- Cracks have formed.
- Poor smoke emission.
- The channel is clogged with soot (cleaning).
- Collapse.
- Destruction of a row.
- Collapse of the head.
- Leaks at joints and roof slabs.
The problems are quite dangerous for the safety of residents; take them into account when repairing. For example, for the first four listed problems, you can use a method that, in its properties and operation, is much more reliable than system recovery. For other faults, relaying rows of bricks, followed by insulation, as is the case with floors, is suitable.
Chimney pipe collapse
Causes of pipe failure
Destruction of brickwork can occur for the following reasons:
- Using low quality brick.
- Violations of masonry technique, which also affects the formation. By the way, moisture also makes its efforts in destruction.
- Damage to masonry due to mechanical damage.
- Natural wear and tear.
Brickwork repair
If a private house is only partially damaged, only a number of damaged bricks may be replaced. They need to be “rescued” from the captivity of the solution and the masonry site must be carefully cleaned. After cleaning, “fresh” material is laid on the solution. Keep in mind that if the bricks are damaged by more than 20 percent, it is recommended to completely dismantle the channel, followed by laying a new one. You need to disassemble down to the last layer of the entire row and start a new construction from there. If this is not acceptable, then only complete dismantling with a choice of type.
Chimney liner
In cases where it is not possible to completely repair, you can resort to sleeves. But keep in mind that it is also necessary to carry out even minimal work to restore the row. By the way, lining can be carried out at the stage of erecting a brick pipe. To understand what a sleeve is in principle, you need to distinguish between the types of metal and brick pipes. A metal or ceramic pipe is inserted inside the channel, and the cavities are filled with heat-insulating material.
Basic malfunctions of metal chimneys and methods for their repair
Repair of metal structures in this regard is considered less labor-intensive. In fact, even if a section burns out, you can easily repair a steel pipe by replacing the required section. As a rule, now according to production standards, the length of the maximum segments is no more than one meter. Often problems arise with the head, where the “umbrella” requires repair or restoration. If low-quality materials were used in production, it can burn out quite quickly. Depressurization of seams is also considered a common malfunction, which is a rather dangerous phenomenon that requires special attention. Repairs to seams should only be carried out using a good sealant, paying special attention to its thermal characteristics.
- an important part of heating; combustion products and carbon monoxide are removed through it. Chemicals contained in the smoke settle on the inner walls of the chimney. When condensation occurs, a reaction occurs to form acid, which destroys the brick or causes corrosion of the metal chimney. In addition to the internal impact, the pipe is negatively affected by external factors: precipitation, freezing and thawing cycles, winds. Damage leads to decreased traction, excessive fuel consumption, and there is a risk of carbon monoxide poisoning. Repairing the chimney can correct the situation.
Causes of pipe failure
- Incorrect chimney laying, leading to excessive condensation.
- The use of low-quality bricks that collapsed within a short period of use.
- Mechanical damage to the chimney, compromising the integrity of the masonry.
- Natural wear and tear of the material during long-term use.
Damage assessment and minor repairs
During the inspection of the pipe, the degree of destruction of the masonry or other defects that led to deterioration in traction are determined. If the inspection reveals cracks and loss of mortar from the seams, then proceed to replacing it. The old solution, which has lost its binding qualities, is removed using a chisel. It is important to go deeper at least 2 cm to make room for fresh composition. The remains are cleaned out and the holes are filled with a new mixture. The masonry mortar contains seven parts sand and two lime to one part Portland cement. The seam is moistened with water before covering. Using a trowel, the composition is applied to the prepared area and distributed, filling all voids. You can qualitatively compact the mortar in the seam using a homemade device made from a bent aluminum tube, equal in size to the seam.
Cracks found on the body of the brick pipe are widened with a metal brush and cleaned of dust. They are sealed with clay mortar or a special sealant designed for use at high temperatures.
Major renovation
If serious damage to the brickwork is detected, a major repair of the pipe is performed, including complete disassembly of the pipe. To work safely at height, the area must be prepared. The bricks are disassembled layer by layer, starting from the top row. The work uses a hammer or perforator. Disassembly is carried out to a row of intact material. The dismantled bricks are collected in a bucket and lowered down. For new masonry, refractory bricks and mortar of Portland cement, sand and lime are used. The pipe is laid out in one brick, strictly horizontally. The inner surface must be smooth, without obstructions for the passage of gases. The end of the pipe is a cement cap, which is most influenced by weather conditions.
In cases where it is impossible to disassemble completely, a sleeve is inserted into its channel - a pipe of suitable diameter made of metal or ceramics. Its smooth surface increases traction, and less soot accumulates on the inner walls. Before installing the sleeve, check that there are no foreign objects or obstacles in the channel. The pipe is lowered entirely or in parts, to connect which the masonry will have to be dismantled. The space remaining between the pipe and the masonry is filled with non-flammable insulation. After installation, the hole is protected from precipitation by a metal roof. Installing a round sleeve promotes efficient removal of combustion products, increases the tightness of the pipe, and reduces heat loss. This option is acceptable only for straight channels that have the same size throughout their entire height.
The second effective way to create a reliable and sealed chimney is to treat the channel with special mixtures. They harden quickly and form a smooth surface that can withstand high temperatures. The Russian mixture “Masan” is developed on the basis of heat-resistant perlite, the Finnish “Mordax” is made from granite chips. Chimney lining has its advantages:
- formation of a monolithic surface without seams;
- speed of the application process;
- the cross-section of the chimney practically does not decrease, since the lining layer is very thin;
- the mixture has high adhesion;
- leakage of combustion products is eliminated.
Before starting work, the chimney is cleared of soot and moistened. The mixture is applied using a special metal brush attached to a winch. To get an even layer, the composition is applied 3 times, the next layer is applied after the previous one has dried. The size of the brush must correspond to the cross-section of the channel.
Chimney cleaning
A common cause of problems with gas removal is clogging of the channel with soot or foreign objects. Soot deposits accumulate on the walls of the chimney and, without regular cleaning every two years, they can completely block the opening. The accumulation is removed with a special brush tied together with a weight to a rope. The device is lowered into the pipe and moves up and down to clear the channel. Pieces of fallen brick or mortar cannot be cleaned with a brush; they are pierced with a special weight. If unsuccessful, you will have to disassemble the bricks at the site of the blockage, remove the interfering object and restore the masonry.
If there is a small amount of plaque in the chimney, they use a folk remedy for cleaning: throw coarse table salt into a well-heated stove, which will cause the soot to separate from the walls. There are special preparations designed to clean the chimney. The principle of their operation: when burned in a furnace, they enter the smoke exhaust channel and react with soot. As a result, the plaque burns out.
In order for a chimney pipe to last for decades, it must be inspected regularly 1-2 times a year. Any minor damage or chips found should be repaired immediately with mortar, then there will be no need to dismantle the structure and lay a new one. Defects in the tightness of the pipe can lead to serious problems - carbon monoxide entering the room or causing a fire. Insulating the pipe, insulating it from moisture, cleaning the channel from soot, and using high-quality bricks and mortar during laying will ensure safe use of heating.
Video
This video shows how you can make a weather vane and a smoke box for a chimney with your own hands (with the tools you have at home):
This video is an instruction for installing a TONA tec SAN chimney inside a brick chimney. Thanks to this technology, it is possible to repair an old, crumbling brick chimney:
Our company carries out professional repairs of chimneys and chimneys in Moscow and the Moscow region. Departure from neighboring regions by agreement. The work includes:
- roof chimney repair
- stainless steel chimney repair
- chimney liner with stainless steel pipes
- installation of FuranFLEX (lining of brick chimneys with polymer liners, using Furanflex technology)
- replacement of stainless steel chimneys
- relaying brick pipes
- lining brick pipes with Mordax (Mordax) or Masan (Masan) mixtures
- repair of ceramic chimneys Shiedel, Tona or their analogues
Every owner of a private, country house in which a stove, fireplace, solid fuel or gas boiler is installed, sooner or later will be faced with the issue of replacing or repairing a chimney pipe. This may be caused by installation errors, incorrect choice of chimney system or its normal wear and tear, because the chimney system is subjected to increased temperature loads, oxidative processes during fuel combustion, and exposure to external factors, which include the sun, wind, snow, rain.
Our company’s employees, professional, certified chimney and stove experts, will professionally approach the issue of repairing a chimney or stove pipe, determine the cause of the malfunction, offer the right solution and materials that are optimally suited to the type of fuel on which the heating device operates.
Roof chimney repair
Repairing a brick chimney on the roof of a house can be done in two ways: the first is by relaying the destroyed brick with new brick; the second is by replacing the pipe with a double-walled (sandwich) stainless steel pipe.
The first option retains the aesthetic appearance of the chimney, but has an average service life of 10 to 15 years, which is caused by the technical characteristics of the brick.
The head of a chimney with brick crumbling over time 
Brickwork is dismantled to a durable part 
New brick chimney head
The second option is more durable, since modern stainless steel chimney systems have a longer service life.
Replacing brickwork with a double-walled stainless steel pipe (sandwich).
Carrying out work on the roof of a house is unsafe, therefore, to carry out the work, together with stepladders and personal protective equipment, wooden scaffolding is installed, which allows you to carry out the work comfortably.
The cost of relaying a brick chimney or replacing it with a stainless steel pipe depends on the cross-section of the pipe, its height, and the complexity of the work. The minimum cost of work is 15,000 rubles, the cost of materials is calculated additionally.
Repair of stainless steel chimneys
Stainless steel chimney systems should be considered modern, reliable designs, but they often require repair or complete replacement, usually due to errors in construction, incorrect choice of steel grade, negligence in maintenance (cleaning) or exposure to external factors – spring melting of snow from the roof and demolition of part (head) or the entire chimney trunk. Next in order:
Stainless steel chimneys collect smoke and condensate.
For fireplaces running on solid fuel (wood, pellets, coal), installation of both smoke and condensate is allowed. In terms of condensate, it is preferable, since when solid fuel burns, condensate is also released, especially when fired in economical modes.
Installation of chimneys for gas and diesel boilers must be carried out using condensate.
When condensate gets between the external and internal contours of the pipe, basalt wool loses its technical characteristics, is compressed, and does not ensure the safe operation of the chimney system.
The steel grade is of paramount importance.
For fireplaces running on solid fuel, it is necessary to use heat-resistant steel grades that can withstand high temperatures.
For diesel and gas boilers, it is necessary to use austenitic (acid-resistant) steel grades, since during the combustion of gas and diesel fuel a weakly acidic solution is released, which is called condensate. Gas condensate, within five years, renders heat-resistant steel grades unusable.
Untimely maintenance of chimneys, that is, their cleaning, can lead to irreparable consequences. Significant accumulation of soot can lead to fire. The combustion temperature of soot is about 1100°C, with permissible values for various chimney systems ranging from 460 to 800°C.
When soot ignites, the chimney begins to hum, flames burst out of it, and the roof and surrounding area are covered with light flakes.
After the soot ignites, the chimney must be replaced!
Not every chimney can withstand such a load, and therefore fires are not uncommon.
If the chimney or part of it was blown away by snow, there is probably no need to explain, you just need to restore it, and if damaged, replace all or part of it.
As a result, repair of stainless steel chimneys comes down to partial or complete replacement of the elements of the chimney system.
Chimney lining with stainless steel pipes
We are all professionals in our field, but when, for example, a dentist takes on the construction of a country house and hires builders from neighboring countries as contractors, mistakes cannot be avoided!
Gas condensate, which I wrote about above, quickly destroys the brick. First, the upper layers of brick begin to fall off from the pipe head, then they appear inside the channel, then the condensate comes out in the form of dark spots on the wall. Goodbye beautiful renovation.
If the internal cross-section of the channel allows, our craftsmen line the brick chimney with pipes made of acid-resistant stainless steel. This creates a new, hermetic system along the entire length of the pipe.
To do this, a technological hole is made in the boiler room, in the pipe, through which the lining is performed. A condensate collector is installed in the lower part of the sleeve, in which all condensate is collected, which in turn is removed into a container or sewer installed below.
Attention!
Do not drain condensate into the septic tank, it will kill all bacteria.
Chimney lining is an effective solution that will eliminate the problem for many years.
Various manufacturers of chimney systems provide a guarantee for their products from 15 to 50 years.
Chimney liner with FuranFLEX polymer liners
Polymer liner FuranFLEX (Furanflex) is the same chimney made of polymer resin reinforced with fiberglass. FuranFlex pipes have sections from 60mm to 1000mm. and are made of any hose length, due to which they have no joints, which ensures high traction rates and guarantees the absence of condensate leaks.
The cost of installing a Furanflex polymer liner is significantly higher than the cost of work and stainless steel materials. Employees of our company recommend the installation of FuranFLEX in cases where the brick shaft does not allow the installation of stainless steel pipes of the required diameter.
Lining the chimney with polymer liners requires access to the channel from above and below, so you must be prepared for partial dismantling of the brickwork in the boiler room.
Despite the fact that the manufacturer's recommendations imply inflating the liner to a circular cross-section, our specialists have mastered installing the liner in square and rectangular brick channels, which allows us to significantly increase the internal cross-sectional area of the chimney.
Chimney lining
Lining brick pipes with Mordax (Mordax) or Masan (Masan) mixtures is relevant for heating fires operating on solid fuel. The lining must be carried out in smoke ducts that are not made of stove bricks, as well as in order to strengthen the ventilation ducts in order to stop the destruction process.
It is undesirable, and sometimes impossible, to line channels that have been in operation for a long time, removing combustion products. Soot and condensation absorbed into the brickwork do not provide the necessary bond of the material to the channel walls.
Lining of chimneys is an event aimed at ensuring long-term operation, but the decision to carry out the work should be made at the stage of building a house.
Repair of Shiedel ceramic chimneys
The Shiedel line of chimneys is represented by various systems made of stainless steel and ceramics. We have already written about the problems of stainless steel chimneys above, so we will touch on the Shiedel Uni line of ceramic chimney systems.
Shiedel Uni chimney systems are convenient, functional, and are subject to various finishing options, but! According to the manufacturer, the permissible operating temperature for ceramic sleeves is 460C°, which indicates that it is absolutely not worth violating the cleaning regulations.
If the soot ignites, the ceramic sleeve will burst and the chimney system will become unusable.
Repair of a ceramic chimney consists of completely replacing the internal ceramic liner. However, let us reassure you a little, if the installation of the chimney was carried out in accordance with the technology, the external blocks do not need to be disassembled, all work will be performed through a technological hole, which is cut out in the lower part of the chimney trunk, above the cleanout hatch.
We sincerely hope that we have described in detail all the issues related to the repair of chimneys, we are always ready to advise you in more detail and, of course, to professionally repair your chimney.
The chimney is constantly affected by many factors, which leads to its destruction. Damage can cause reduced traction and excessive fuel consumption. To fix this problem, you need to repair the pipe.
Causes of pipe failure
A brick chimney can collapse for several reasons:
- improper masonry leading to condensation;
- use of low quality material;
- mechanical damage to the pipe;
- natural wear and tear of the chimney.
A common problem is the appearance of condensation. During the combustion of any fuel, hydrogen combines with oxygen, resulting in the formation of water vapor. As the gas passes through the chimney, it cools and condenses on the walls. In this case, soot dissolves in the liquid, which leads to the appearance of acids or mixtures thereof.
It is because of condensation that many chimneys are destroyed. Microcracks form in them, which can lead to smoke penetration into the room. It should be noted that the appearance of deformations can subsequently lead to the destruction of the interior finishing.
In houses with large living space and powerful boiler equipment, the first signs of destruction may appear within 2 years. The rate at which cracks appear depends on the type of fuel used. Most often this happens due to the fact that the house uses an automated boiler room. Such equipment heats up to a specified temperature, and then stops and starts only when the temperature drops to a certain limit. This promotes condensation.
If a chimney is destroyed, you can use several methods to restore it. The choice of a particular option depends on the degree of deformation. In some cases, it is necessary to rebuild the chimney.
Damage assessment
To find out the degree of destruction of the masonry and determine whether repairs are needed, you should carefully inspect the pipe. Often the cause of poor traction is a large amount of soot. Also, many encounter a problem in which partial loss of the solution occurs and small cracks appear. In this case, you should start replacing the solution.
Before carrying out repairs, the space between the bricks is cleaned with a chisel to a depth of about 2 cm. After this, the voids are filled with new mortar. Before carrying out this work, you need to moisten the seam with water.
If cracks are noticed during the inspection of the chimney, they are expanded with a brush and cleaned of dust. They need to be sealed using clay or a sealant that is designed for high temperature use.
When inspecting the pipe and carrying out repairs, safety precautions should be observed. It is also important to lower or lift building materials for chimney repairs with an assistant. This will significantly speed up the entire process. If defects were found during the inspection, they should be eliminated as soon as possible, since ignoring them can lead to destruction of the chimney. In this case, it will have to be posted again.
It should be noted that during the construction of the pipe, knockout bricks are laid, which allow access to certain areas of the structure. During repairs, it is enough to knock them out with a hammer and clean them if necessary.
Major pipe repairs
If serious damage is noticed during the inspection, a major repair should be carried out, which involves complete disassembly of the structure. If the work will be carried out independently, you need to think about safety in advance and prepare the place.
Dismantling of bricks should be done layer by layer from the top row. For such work, you may need a hammer and a hammer drill. Dismantling is carried out down to a whole row of bricks. During such work, it is worth gradually lowering the bricks from the roof so that they do not accumulate near the chimney.
To create the furnace, only refractory bricks are used. Chimneys are laid in one brick. During work, it is necessary to lay the material only using a building level. The internal surface of the chimney should not have any obstacles to the passage of gases. Even if there is a small amount of protruding solution on the walls, this will cause the accumulation of a large amount of soot.
If it is impossible to disassemble a brick chimney, a sleeve can be inserted into the channel. This element can be a metal or ceramic pipe. Since the pipes have a smooth surface, this increases traction. At the same time, less moisture accumulates on the inner surface. Before repairs, it is necessary to check whether there are foreign objects in the chimney. The pipe can be lowered entirely or in parts.
The space between the metal product and brick structures is filled with insulation that is resistant to high temperatures. After such work, the pipe must be protected from precipitation. Installing a sleeve allows you to effectively remove combustion products and also increase the tightness of the structure. It should be noted that this option is only suitable for chimneys whose channel width is equal over the entire length of the structure.
Another way to restore a brick pipe is to treat the channel using special mixtures. Such substances harden quickly and allow you to create a smooth surface. These substances can withstand high temperatures. This method has several advantages:
- formation of a surface without seams;
- speed of repair work;
- the cross-section of the chimney is almost not reduced, since the layer of applied material is very thin;
- Thanks to the use of such mixtures, the possibility of gas leakage during operation of the furnace is eliminated.
Before repairing a brick chimney, it is necessary to clean the channel from soot and moisten it. The mixture is applied using a metal brush, which is attached to a winch. To obtain a more even layer, the composition should be applied 3 times.
Pipe cleaning
One of the most common reasons for decreased traction is contamination of the channel with a large amount of soot. To get rid of this problem, you need to use a special brush to which a weight is tied. This device is lowered into the pipe before the channel is completely cleared. If such work is not carried out, several years after starting to use the stove
Another way is to use salt. If there is a small amount of soot in the chimney, you can throw coarse salt into a well-heated stove. This will help separate the soot from the pipe. You can also use special preparations. After combustion, they enter the chimney and react with soot, which helps remove it.
To avoid problems with the chimney, you should check its condition regularly every 1-2 years. If chips or cracks are found, they should be immediately cleaned and sealed with mortar. If during operation of the pipe there are problems with tightness, this can lead to carbon monoxide entering the room or even a fire. The use of high-quality brick and mortar during renovation will make the structure durable and reliable.
If you do not have a special brush or experience in carrying out such work, you should contact a specialist. If cleaning and repairs are carried out incorrectly, much of the soot may remain in the chimney, and the work will need to be done again.
-
How many years a chimney can last is a question to which it is difficult to give a definite answer. In practice, it could be a year or a hundred. Too many factors influence its durability. Some of the most important are the design of the chimney and, of course, the way it was folded. We must also not forget about the time factor and the maximum loads placed on the pipe.
The chimney, like any other engineering system, requires maintenance and periodic repairs. The essence of servicing the smoke exhaust duct is to clean its internal surfaces from soot and soot. This procedure can be carried out independently using special tools. But repairs can be quite a complicated process.
How to assess the complexity of repair work
Carrying out repairs, chimney cleaning, lining, lining, etc. blindly is strictly prohibited, as this can have serious consequences. Therefore, any work of this kind should begin with an inspection of chimneys and ventilation ducts by specialists. Today, video cameras and computer analysis are used for these purposes.
After drawing up a technical report, including:
- description of the system state,
- diagrams (if necessary),
- photographic materials,
- measures necessary for repairs or other measures to bring the system into compliance with standards are issued a special Inspection report for chimneys and ventilation ducts. By the way, without such an act it is prohibited to connect gas or replace the boiler. According to current regulations, the condition of the structure must be checked annually.
When repairs are needed: natural and artificial reasons
There are a number of reasons why a chimney collapses. This can happen for natural reasons, say, due to aging over time or from exposure to natural forces - frequent rain and snow, hail, sudden temperature fluctuations. The water that has managed to soak into the masonry periodically freezes and thaws, which causes the formation of cracks. This, in turn, leads first to the loosening of small fragments of bricks, and then to the loss of whole ones. However, the destruction of brickwork can also be associated with
- using bricks that do not meet the requirements for pipe laying,
- poor quality masonry,
- exposure to condensation,
- absence or incorrect design of a protective umbrella, etc.
Chimneys made of hollow bricks are more reliable and less demanding on maintenance.
It is quite simple to explain: the solution, getting into the voids of the brick during the laying process, becomes a kind of buffer that absorbs moisture that has seeped into the seams.
Unlike them, in the version made of monolithic bricks, if the masonry is not sealed, then the probability of its delamination along the mortar joints is quite high. As a result, the roof near the chimney often leaks. Similar problems usually arise when using low-quality masonry mortar, as well as an excess or deficiency of one of its components: sand or water.
The service life of a chimney is also related to the operating conditions of heating devices and its intensity. Under the influence of a constant flow of heat from the stove, the chimney becomes warm enough in winter, so snow does not linger on it and a crust of ice does not build up. However, if the pipe has not warmed up for a very long time, and then suddenly heats up to a high temperature, then serious problems can arise.
How to repair: basic options
If the pipe was laid by an experienced mason and used high-quality materials, then, provided that it is used correctly, the chimney can last 15–30 years before major repairs. With regular maintenance this period can be extended. To do this, the outer surfaces of the pipe are usually completely treated with a special penetrating waterproofing, which prevents moisture from penetrating into the joints of the brickwork.
How to deal with cracks
Brick chimney repair If cracks appear on the body of the pipe, it should be carried out as quickly as possible, preferably before the onset of frost:
It is important to ensure that after such repairs, rainwater or snow does not get into the crack. Otherwise, it is quite possible that the most seemingly harmless crack in the masonry will begin to quickly grow to catastrophic proportions.
Work to restore the cement head
Even regular maintenance cannot completely protect against
exposure to snow and ice, rainwater. And first of all, the cement head suffers from this. If repairs become necessary, it is usually cut down and refilled. This process in itself is not complicated, however, since the pipe repair is carried out at a high altitude, you need to carefully prepare for it - build convenient scaffolds, ladders and fences.A dilapidated cement cap can easily be cut out with a hammer drill, but it is more correct to cut it into small fragments with a grinder, carefully remove them, put them in a bucket, and lower them from the roof.
Often, in addition to the top, the uppermost sections are also destroyed. It is recommended that these parts be replaced or repaired before the head is poured. It is also necessary to carefully inspect all the seams of the brickwork adjacent to the head. If necessary (they are weakened and crumbling), the seams are opened with a grinder, washed and sealed with fresh mortar.
Complete pipe re-laying
If the volume and list of necessary repair work is too large, then all the problems can be solved at once by relocating the pipe. Moreover, you can be sure that there are no unnoticed or hidden defects in the masonry.
Old pipes are dismantled layer by layer, brick by brick. The laying of a not very large pipe in cramped conditions can be disassembled using an ordinary weighted hammer and a scarpel. If the pipe dimensions are large or the solution is strong enough, it is better to use a hammer drill. It's best to remove one brick at a time, place them in buckets, then lower them safely from the roof. As a rule, old chimneys can be dismantled and rebuilt without much hassle.
In some cases, complete rework of the shaft can be avoided by inserting a metal pipe made of heat-resistant steel inside the chimney. This is perhaps the most economical and reasonable solution, since, on the one hand, it does not require a large amount of labor-intensive work associated with brick and cement, and on the other hand, it avoids the destruction that is inevitable when dismantling the old one.