The proper functioning of the fireplace depends not only on the installation of the furnace, but also on the competent design and installation of the chimney. Everything is important: from calculations of the pipe section to the nuances of thermal insulation. Only a quality chimney will maximally meet its purpose.
Do you want to build a chimney, but don’t know which pipe to choose and how to install it later? We will help you deal with this problem - in the article we examined in detail how to make a chimney for a fireplace, paying attention to the pros and cons of pipes from various materials.
And also brought important requirements for the arrangement of fireplaces and the preparation of the project. The article material was supplemented with detailed instructions for the installation of the chimney, providing it with step-by-step photos.
Design features of the chimney
The purpose of the chimney chimney, as well as the main function of the chimneys of stoves or boilers, is the output to the atmosphere of the products of combustion of fuel. Gases along with soot come from the furnace into the pipe under the influence of traction.
The correct formation of the chimney consists in the selection and construction of such a structure, in which at least soot remains on the pipe walls, and the draft prevents the entry of gases into the room.
Chimneys of various materials have their own characteristics and may vary in design. For example, a traditional brick chimney consists of the following parts.
Modern chimneys made of steel or ceramics do not have such fragments as an otter or a fluff, but for the normal removal of smoke in brick pipes and to protect the floors from heating, they are simply necessary
When choosing a material, it is necessary to take into account the temperature of the gases: in the furnace it is higher, the output is lower, however, even at the highest point it can reach +100 ° С. The creation of traction is built on the temperature difference - hot air is replaced by cold.
Also important are indicators such as the height and internal diameter of the chimney - they are calculated during the preparation of the project.
A variant of the fireplace with a chimney made of steel pipe. Features: floor and wall cladding with non-combustible materials, ceilings, the ability to create non-vertical sections using semi-bends
With all desire, it is impossible to build a chimney that does not need to be cleaned. Even in a ceramic chimney assembled in accordance with all the rules, soot accumulates over time, making it difficult for gases to escape. Therefore, the chimney should be cleaned regularly. This is usually done at a time when the fireplace is idle.
In addition, it is necessary to monitor the integrity of the joints and the inner surface: cracks, bumps or protrusions that may appear over time interfere with the normal circulation of hot air.
Norms and rules for the installation of a fireplace
Consider excerpts from SNiP 2.01.01-82, which may come in handy when installing a chimney for a fireplace.
The chimney and ventilation duct have different purposes, so you cannot combine them or use one instead of the other. Only one heater with an open type of combustion can be connected to one chimney (the same applies to the stove).
If two fireplaces are located on the same floor, then they can be connected to one smoke exhaust channel, but it must be equipped with a cut made in the form of a transverse wall at a height of 75 cm or more.
For concrete and brick chimneys, the minimum dimensions of the channel section are indicated. For example, if the power does not exceed 3.5 kW, the smallest cross-section is 14 cm x 14 cm (for a circular cross-section - a diameter of 16 cm), if the power is higher than 5.2 kW - from 14 cm x 27 cm (for a circular cross-section, a diameter of 22 cm).
The draft characteristics depend on the height of the chimney. The minimum allowable size is 5 m from the grate to the extreme point of the outer pipe section. With insufficient height and the wrong choice of the channel cross section, you may encounter the problem of the occurrence of reverse thrust.
The height above the roof depends on its type: flat - half a meter, pitched - more than half a meter from the ridge (if the distance to the ridge is one and a half meters), flush with the ridge (if the distance is 1.5-3 m) or on a conditional line towards the pipe from ridge at an angle of 10 degrees (if the distance is 3 m or more)
The thickness of the walls of brick structures is not less than 12 cm, of smoke exhaust channels from concrete - from 6 cm. The base of the chimneys must be equipped with windows with doors for cleaning. To facilitate cleaning work during the construction of a brick pipe from the inside, there should be no concessions or excavations provoking the accumulation of soot.
If it is necessary to remove the pipe (for example, bypassing the beam), inclined (up to 30 degrees) and horizontal (up to 1 m in length) sections of the same diameter as the main channel are possible.
The top of the chimneys should be protected with an umbrella-type device so that no precipitation enters the pipe. If the roofing material does not have sufficient fire resistance, the installation of a spark arrester is also mandatory (maximum grid cell sizes are 5 mm x 5 mm)
The floor, walls and ceiling in the adjoining areas of the fireplace must be protected with fireproof materials - metal sheets, asbestos board, plaster.
When passing a brick or concrete chimney through the ceiling, the gap should leave a minimum of 13 cm (the same applies to insulated pipes), for ceramic structures, the norm increases to 25 cm.
Professionals insist on installing the chimney not in the outer wall of the house, but in the inner carrier, explaining this by the harsh Russian winters. Mounting it in the outer wall (in extreme cases), you should carefully protect the structure from freezing by thickening the masonry or a thermal insulation device made of non-combustible materials.
Types of chimneys for a fireplace
An analysis of various types of chimney channels allows you to find out which chimney is better for a home fireplace. Structures may differ both in design and material of manufacture, with the second factor being decisive.
Therefore, when choosing a scheme, you need to start from the material, but the choice of material for construction depends on the regulatory requirements and the wishes of the owners of the house.
Option # 1 - Ceramic
If funds allow, this is the first option that you need to pay attention to. Manufacturers, using popular schemes for the construction of fireplaces, thought out the manufacture of all kinds of parts, so you can purchase a ready-made kit for construction.
Of course, the number of parts can be different - depending on the shape and size of the structure.
Ceramics are ideal for wood-burning fireplaces that produce a large amount of "white smoke". The result of its effect on the pipe walls is condensate, which is not at all dangerous for ceramics. In addition, it is it that withstands increased heat and various chemical media formed by combustion products.
What else positively differ ceramic chimneys:
- perfectly smooth surface of the inner walls;
- fast heating and slow cooling;
- resistance to temperature up to + 900-1000 ° С;
- compactness in comparison with other designs;
- service life up to 50 years.
The disadvantages include significant weight, because of which it is necessary to arrange an installation site or a special foundation.
Also, many are confused by the high cost of the units and the services for their installation. Indeed, when mounting parts, care must be taken, use special glue and, at the last stage, use a finish made of heat-resistant materials.
When choosing, it is better to focus on the established brands: Hart, Tona, Ecoosmose, Schiedel, Effe2.
Option # 2 - brick
Brick is a traditional, one might even say ancient material. Over the centuries, many technologies have been invented for the construction of various types of stoves and fireplaces, and today it is possible to use the best of them.
Brick is preferred because of accessibility, but only one type is suitable for high-quality masonry - full clay body. It is pre-baked and fully ready for use at high temperatures.
The masonry mortar is also important, the main purpose of which is to provide a tight, tight connection between the bricks. Normal cement mortar is not suitable. It is necessary to mix a solution of sand, cement and lime (5: 2: 1), which resists high temperatures, does not crack and does not crumble ahead of time.
When performing masonry, make sure that the solution from the joints does not protrude into the inside. The smoothness of the pipe is one of the main conditions for a long and trouble-free operation. More information about brick chimneys below.
Option # 3 - Steel
If the temperature of the gases in the smoke exhaust channel does not exceed + 400 ° C, steel chimneys can be used. Modern pipes made of heat-resistant anti-corrosion steel are lighter than ceramic counterparts and are suitable for almost all modifications of fireplaces and stoves. It is not necessary to erect additional sites or foundations for metal pipes.
The advantages are also a round cross-section, which does not prevent the removal of gases and is convenient for preventative cleaning.
Installing and connecting steel parts is easier than building brickwork or mounting fragile ceramics. They can be inserted inside old brick chimneys, making a sleeve.
Conventionally, steel chimneys are divided into 2 categories:
- simple "hot" typewithout thermal insulation;
- sandwich pipesconsisting of three layers - thermal insulation is inserted between two layers of metal.
The heat-insulating material is subject to special requirements. It should not emit products hazardous to human life during heating, have minimal thermal conductivity and do not burn. In construction markets, you can purchase ready-made sandwich set kits and assemble a do-it-yourself sandwich chimney. And you can make an order for a private project.
The cost of the chimney can not be called budget, but it justifies itself.
Option # 4 - Glass
A beautiful glass chimney is attractive not only externally. It is made of durable tempered glass, which is inert to chemical influences that are characteristic of combustion products.
In addition, perfectly smooth walls prevent the deposition of soot in large quantities, as a result, the flue must be cleaned much less frequently.
It is difficult to call a chimney made of glass a practical product. A small deposit of soot reduces the aesthetics to zero, so you will have to wash the visible parts often enough
The disadvantages of glass are additional requirements for insulation and insulation, special assembly technology (difficulty in creating tight joints), the possibility of condensation.
If we compare expensive glass and ceramic chimneys, then the latter will benefit both in technical characteristics and in operational qualities in general.
Having looked at the overview of pipes made of various materials, you still could not decide which is best for you? Then we advise you to look at our other article, in which we gave important criteria for choosing a chimney pipe, which should be guided in specific conditions.
Ceramic Smoke Canal Construction
The most reliable and safe version of the chimney device in a wooden house is a construction of ceramic blocks. The outside of it practically does not heat up, which means that there will be no problems with passage through the floors.
Consider the assembly sequence of the smoke channel of the components of the German brand Schiedel Rondo Plus:
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Ceramic modules for channel assembly
Basalt cotton wool insulation
Expanded clay blocks for barrel assembly
Shaped elements for a ceramic pipe
We will make a reservation right away that a radical, i.e. stand-alone pipe for which a separate foundation is arranged.
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Step 1: Laying the clay layer on the foundation for the chimney
Step 2: Installing the first block on the waterproofing
Step 3: Aligning the block according to the position of the rafters
Step 4: Fixing the starting block to the cement mortar
Step 5: Fill the starting block with mortar and boulders
Step 7: Aligning the top of the block with mortar
Step 7: Assembling the chimney into a heat-resistant solution
Step 8: Installing the second expanded clay block
All technological holes are cut along the construction site. Cutting is done with a conventional grinder with a diamond disk.
To make geometrically accurate holes, a ceramic chimney is equipped with a template. Further:
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Step 9: Installing the base of the ceramic channel
Step 10: Location of the condensate drain pipe
Step 11: Installing the Thermal Insulation Mat
Step 12: Application of High-Temperature Sealant to the Module End
Step 13: Installing the third expanded clay block
Step 14: Installing the module for the revision device
Step 15: Locking the Revision Chamber Door
Step 16: Installing the module for connecting the fireplace
The assembly of the ceramic chimney is carried out in the standard order: the modules are expanded one by one. However, it is worth paying attention to the specifics of passages through the attic floor and through the roof.
In our example, the chimney and the ventilation riser are located nearby, because of which we had to slightly hang the rafters:
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Despite the fact that the outer surface of the ceramic chimney is practically not heated, it must be isolated from wooden structures
Since in the above example, the ventilation riser is being built next to the chimney, they must also be separated by installing a wooden divider and mineral wool
The passage between the floor beams is equipped with a box constructed of timber. Between it and the pipes, basalt cotton wool is freely laid, which is pre-compressed so that after straightening in the gap it could completely occupy the space and did not require fixing
To pass the ventilation riser through the roofing system, one of the rafters had to be hanged
In order not to weaken the rafter system at the passage, the suspended rafters are reinforced with an additional board
Around the aisle, the waterproofing cut in the form of an envelope is folded up and glued with tape to prevent water from entering the roofing cake
The construction of the smoke channel after crossing the roof is carried out in the standard manner
Around the pipe, a waterproofing strip is glued around the perimeter so that 10 cm of it comes into the walls of the chimney. Four metal strips are screwed on top, starting from the bottom, overlapping the junction of the top
Arrangement of passage through floor beams
Cutting between ventilation and chimney
Laying mineral wool mats
Raising the rafters under the ventilation riser
Strengthened Clipped Rafters
Arrangement of a roofing cake around the aisle
Construction of a chimney above the roof
Installing a metal apron
Also on our website there is another article containing step-by-step instruction on the construction of a ceramic chimney, its fastening and decoration of the outer part.
Brick Chimney Construction
Regardless of the material used, the construction of the chimney must comply with the rules and regulations.If it is incorrect to calculate the diameter or height of the pipe, choose a brick that does not meet the standards, forget about thermal insulation in the cold zone, the result may be disappointing.
Design Guidelines
There are two options for building a brick chimney:
- with rectangular section - using only brick;
- with round section - with an external calculation of chimney bricks and an internal ceramic (asbestos-cement, steel) pipe.
The first option is common, but not desirable. The design with internal corners is inferior to the cylindrical shape in the quality of smoke extraction. In a chimney of rectangular cross-section, soot accumulates faster, and it is more difficult to clean it, therefore, if possible, it is better to choose a combined design
Modern asbestos cement is not more harmful than slate or asphalt, so you should not be afraid to use pipes. However, there is one nuance that manifests itself with insufficient insulation - this is the rapid absorption of condensate. It is clear that a pipe with a broken structure will not last long, which is why ceramics are becoming more and more popular.
Brick pipes are constructed with a square or rectangular section. If a round metal round sleeve is installed inside the brick channel, it is installed to the entire height directly from the firebox. Narrowing of the smoke channel is not allowed along the path of removal of combustion products
In order to accurately calculate the internal diameter of a brick or ceramic chimney for a fireplace, it is better to consult with specialists: the height of the pipe, its direction, number of turns, material of manufacture, volume and temperature of the exhaust gases, type of fuel, fuel combustion rate, etc. are taken into account.
However, there are several general rules that should not be overlooked. Suppose, for chimneys of cylindrical section, the standard proportion with respect to the furnace is 1:10.
Especially for fireplaces, the so-called "Swedish method" is used: determining the area of the chimney (f) by the area of the furnace (F). The graph shows the values for fireplace systems with a round, square and rectangular section
It is also believed that the cross section of the chimney must exceed the diameter of the blower. When calculating the height, it is necessary to focus on the height of the building (including the roof), the type of roof, the location of neighboring buildings.
If a horizontal section is planned in the structure, then its length should not exceed 1 m.This requirement is explained by the natural movement of heated gases vertically, which means that most of the soot will be deposited on the walls of the horizontal section - the most difficult to clean.
Construction nuances of construction
One of the distinguishing features of masonry is layering. At the same time, the composition of the adhesive for the joints of the ceramic pipe and mortar is selected to create a sealed brick structure.
It is important that during heating the seams do not deform and do not change the shape of the pipe. The inner surface should be as smooth as possible, without protrusions and nicks.
To connect pipe segments of different diameters, there are reduction steel or ceramic adapters. Mounting points on the pipe must be sealed so that there is no gas leak
In addition to reducing adapters, other shaped parts are also used - revision openings with doors, tees, corner elements.
To prepare for work old, long-unused chimneys, one cleaning is not enough. For effective work, a sleeve is needed - the insertion of a metal pipe of circular cross section. The brick walls of the chimney and steel should not be in contact, a gap should be left between them.
Mandatory stage - thermal insulation. It allows, on the one hand, to increase the heating rate of the pipe, and on the other hand, to reduce or eliminate the formation of condensate. Also, insulating material for chimneys is a barrier against heating of combustible materials in the vicinity of the pipe (although this should not be the case under the rules).
Of particular note is the arrangement of the passage through the ceiling and roof, in the construction of which wood is involved.
Wall materials around the chimney chimney can be any, but not necessarily combustible. Often, wooden (log, beam) walls are left as is - this is a violation. Ceramic finish (clinker, tile) or metal sheets suitable
It is also necessary to finish the outer part of the pipe over the roof. To protect against debris and precipitation, “houses”, stylized weathercocks, and deflectors are installed.
Step by step instructions for laying the chimney
The prepared project is a guide to action: it has a masonry scheme, an estimate, a listing of construction activities. Masonry brick chimney - this is the final part of the construction of the fireplace.
Step 1 - preparation of materials and tools. To prepare the solution, sand, cement, lime (or special clay), a container are useful; for the construction of masonry - embroidery, trowel, hammer, level.
Step 2 - preparation of the solution. Masters usually know special secrets on how to make the solution more elastic and non-cracking. For example, some lime is added to it. The consistency of the mass should resemble sour cream, be thick, but easy to separate.
Step 3 - masonry. Ready-made ordering facilitates the work - each row must be stacked according to the schemes. If a ceramic or steel pipe will pass inside the brick body, this also needs to be taken into account when choosing a scheme and section size.
Step 4 - a fluff. This element - the expansion of the pipe - is arranged when passing through the ceiling. The brick is shifted by ¼ towards the outer edge.
As a result of the shift, the thickness should reach 0.5 m. A sheet metal sleeve and pieces of basalt thermal insulation are inserted into the gap between the masonry and the ceiling.
Step 5 - laying masonry in the attic. For a non-heated room, thermal insulation is required. The transition through the roof is equipped with another extension - the otter. It protects the attic from rain.
Step 6 - design of the outer pipe and head. If necessary, a spark arrester, a deflector (for adjusting traction) are installed, a ridge canopy or a cap (umbrella) above it. In the building market, you can buy ready-made heads.
A few tips from the masters of stove and fireplace business:
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Smoke collector - the basis for the construction of the chimney
Using level to check horizontal
Masonry tool
Floor pipe hole
The number of bricks for the chimney
Thermal insulation of the pipe in the attic
Throughout the masonry, 2 points are important: for the tube to stand strictly upright and for its inner surface to be perfectly smooth. The sleeve guarantees smoothness.
The videos are useful for those who want to build a fireplace on their own and not make mistakes when designing and installing a chimney.
More information about chimney sandwich:
Arrangement of a brick pipe on the roof:
Assembly of modular ceramic pipe:
The construction of a chimney for a fireplace is a fascinating task, but it will bring practical benefit only if the installation standards and rules are observed.
If you are at a loss with the choice of material or design of a pipe, we recommend that you turn to experienced stoves who know many secrets of the quality construction of fireplaces.
We decided to build a chimney for our fireplace with our own hands, but in the process of studying the information you still have unclear moments? Ask for advice from our experts and other site visitors - we will try to clarify difficult questions.
Or maybe you have practical experience in arranging chimneys and want to point out some inaccuracies or shortcomings in the material presented? Or do you want to supplement the material with useful tips from a professional? Please write about this in the comments section.