The service life of a fireplace or stove largely depends on how and how the chimney is sealed from stainless steel or other materials.
Proper installation does not guarantee the absence of problems with the ingress of combustion products into the room. Over time, pipe materials undergo thermal deformation, which leads to ruptures and cracks in the structure.
This leads to a decrease in traction, as a result of which a large amount of combustible material is required to heat the house, and because of this, soot intensively settles on the inner surface of the pipe. The latter is especially dangerous, as it leads not only to the formation of condensate, but can also cause a fire in the pipe.
For this reason, for the stable functioning of a chimney made of stainless steel or any other materials, it must be regularly inspected and the shortcomings that have arisen promptly eliminated. To avoid problems in the future, it is better to seal all cracks and joints to avoid defects.
A wide range is presented on the construction market. All the wealth of choice is conditionally divided into heat-resistant and heat-resistant sealants, although, of course, there are much more varieties.
Types of stainless steel chimney sealant
Due to the sealing of cracks in chimneys or chimneys, combustion products will not enter the room through them. Reliable insulation makes the use of the stove, fireplace or boiler as safe as possible.
Watch the video - high temperature cleaners for stainless steel and other materials
All sealants can be divided into several types:
- based on silicone or silicate;
- by composition: one-component or two-component;
- according to temperature characteristics: temperature-resistant sealants and heat-resistant.
As the name implies, one-component sealants consist of one component and do not require mixing of ingredients before carrying out the sealing procedure. This makes them easy to use and popular with private homeowners who appreciate the ease of use of an insulation product.
Two-component However, before starting work, you need to mix, clearly observing the proportions indicated in the instructions. In this case, the finished product should be used within a few hours after mixing. This option is not very suitable for sealing joints with your own hands, usually professional builders use two-component insulation.
In addition to insulating the chimney, sealing compounds are also used to insulate the joints of the heating system structure based on an electric boiler when eliminating pipe leaks.
Silicone sealants for stainless steel, glass and other materials
When wondering how to seal a stainless steel, glass, plastic or ceramic chimney, you should pay attention to refractory silicone. This material contributes to the tight contact of structural parts with each other and reliable insulation. The main advantages of the silicone composition:
- due to elasticity, the quality of contact is maintained for a long time, even when, due to high temperatures, the structural elements are deformed and change position relative to each other;
- after completion of the polymerization process, the material becomes very durable;
- silicone is absolutely waterproof;
- the material has a high degree of resistance to ultraviolet radiation and other weather phenomena;
- silicone is characterized by high thermal and heat resistance.
There are two types of silicone sealants:
- Acid. They release acetic acid during curing, which can damage the chimney or roofing. Such a tool will definitely not become an assistant in solving the problem than sealing a chimney made of stainless steel or a material of natural origin: cement, stone or concrete, as it can contribute to the formation of corrosion of metal elements, the destruction of sections of the pipe and roof in contact with it.
- Neutral insulation products, unlike acidic ones, emit water and alcohols into the environment when they harden. It is a suitable sealant for stainless steel chimneys.
An additional plus of silicone-based products is that as a result of heating, the iron oxide included in it turns brown, which makes the insulation more invisible against the background of a roof or brickwork.
Heat-resistant and heat-resistant sealants: what is the difference?
According to the temperature characteristics, the means for insulation are divided into heat-resistant and heat-resistant. They are used to seal the joints of different sections of the structure, as they can withstand different temperatures. If heat-resistant ones are suitable only for external surfaces, then heat-resistant ones can be used to seal the slots of a high-temperature chimney, where temperatures are especially high.
Heat-resistant adhesive for sealing: scope, characteristics
This type of insulation is suitable for working with the external walls of the fireplace, stove, as well as processing the junction of brickwork and roofing.
It should not be used for stainless steel pipes, as it has a rather low heating temperature - only 350 ° C.
Heat-resistant sealant is made on the basis of silicone. The temperature range at which the product can be used is influenced by the additional components present in the product and their percentage. The most common additional component is iron oxide, which gives the insulation a brown tint.
The main characteristics of this type are as follows:
- high elasticity of the thermosealant: due to its resistance to deformation, silicone can be used for insulation on pipe sections of a rather complex shape. It will easily cope with the task and will not be covered with cracks under the influence of temperature;
- the average temperature range of heat-resistant silicone ranges from +250°С to +320°С;
- resistance to ultraviolet radiation: insulation can be used to seal external structural elements;
- silicone does not pass moisture, which also makes it suitable for outdoor use. Rain and snow are not afraid of him;
- high adhesion allows the silicone compound to adhere perfectly to a variety of types of surfaces: brick, metal or ceramics.
Silicone has few drawbacks, but still they are:
- due to its low heat resistance, it is not suitable for sealing internal surfaces that directly interact with fire;
- since the material is elastic, it cannot be dyed. The paint will not remain on its surface for a long time.
The curing speed of heat-resistant insulating material depends on the temperature at which the work is carried out. At low temperatures and high humidity, the composition will take longer than indicated on the package. In dry air and high temperatures, it will harden faster. Also, the insulation is better fixed on a dry surface.
Heat-resistant sealant: for which structures it is suitable, the pros and cons
A heat-resistant insulation agent is a better option than caulking metal and stainless steel chimney joints. This is explained by the fact that silicate, which is the main component in the refractory composition, perfectly withstands high temperatures up to 1200-1300°C, and even up to 1600°C under short-term load.
Watch the video - stainless steel against galvanization
The silicate composition is suitable for sealing cracks in fireplaces, stoves, where there is direct contact with fire. As a rule, high temperature insulation material is gray or black.
The main advantages of fire-resistant silicate:
- the chemical inertness of the agent allows it to be used for structures made of any material, since it does not react with it;
- silicate insulation is resistant to sunlight and precipitation, it can be safely used to treat outdoor chimney sections;
- the top layer after drying becomes porous, making it easy to paint.
- at the end of the polymerization process, the agent becomes rigid: the slightest vibration or “walking” of structural elements can lead to cracks. Therefore, it is not used for pipes made of materials prone to significant thermal deformations. Only cracks should be sealed with a silicate composition, since when processing the chimney elbow, problems may arise with its disassembly for cleaning in the future;
- silicate products have rather low adhesion: the composition will not last long if the sealing site is not treated with a special composition before applying it;
- The silicate-based sealant can only be applied at temperatures above 20°C and humidity not below the standard level. If these conditions are not observed, the seam will seize much longer.
Although all silicate thermal sealants are capable of withstanding high temperatures, it is best to use only flame retardant sealants marked “fireproof” to seal areas that will come into contact with a flame.
It is not necessary to apply a silicate sealant in several layers to increase its wear resistance: this way it cannot dry out and becomes covered with cracks. The required width and depth of application are indicated in the instructions. The silicate agent is better fixed on a damp surface, so before starting work it is better to slightly moisten the area where it is planned to be applied.
Thermal tape and hot glue
Another way to cover up joints and cracks is with heat-resistant adhesive sealant. The adhesive composition for insulation can be made on the basis of materials such as acrylic, silicone or polyurethane. The composition allows not only to seal the seams, but also to reliably glue the surfaces of materials together. The adhesive has excellent waterproofing properties, has good adhesion to natural materials and concrete.
How to properly seal?
Most often, the heat and waterproofing of the fireplace causes difficulties, or rather, the removal of a stainless steel pipe through the roof and the covering of the seams between them. This is important not only for high-quality insulation of the pipe, but also so that the roof does not leak.
The place where the pipe connects to the roof is called the chimney outlet. This is a key part of the whole structure, which must be carefully sealed. The durability of the roof and the quality of the heating system depend on its reliability.
Most modern roofing materials, in addition to the main elements, have special parts made of non-combustible compounds, with which you can surround the chimney with a coating as tightly as possible and prevent heating of the roof from a hot chimney and possible fire. Thus, insulation also performs fire-fighting functions.
Even if the house does not have a fireplace or stove, and it is heated with a boiler, it still becomes necessary to purchase a sealant for the boiler in order to ensure good traction and stable operation of the heater.
Most sealants are packaged in cartridges or tubes with a sharp tip that must be cut at a 45° angle before starting work. It is important to make a hole of the same diameter as the future seam.
Squeeze out the sealant using a standard construction gun, evenly applying it to the desired sections of the chimney. If a collapsible stainless steel chimney is processed, then the composition is applied only to the joints, so that in the future it can be easily cleaned and disassembled for cleaning.
There are a few simple rules for working with sealants:
- it is not recommended to seal pipes and other structural elements at temperatures below +5°C;
- you need to work only with gloves, if the sealant gets on the skin, immediately rinse this place with running water;
- the insulation composition requires at least a day to dry completely;
- at the end of the work, you should light the stove or light the fireplace to check the quality of the work done.
The sealant must be used as follows:
- Clean the surface where the sealant will be applied;
- If the composition is heat-resistant, then it is better to treat the area with an abrasive to increase adhesion. If the surface is made of brick, you can make a few scratches on it for this purpose;
- The place of application is degreased and dried (naturally or with a building hair dryer). Drying is needed only for silicone-based formulations, for applying heat-resistant ones, on the contrary, the surface needs to be moistened.
Next, cracks, crevices and joints are sealed: work must be done strictly with gloves, observing the thickness and width of the seam specified in the instructions. It is important to provide air access to the place of application of the composition: this is necessary for its high-quality hardening.
Sealing the chimney with cement
If there are silicone and silicate sealants for modern finishing materials, then to seal a slate roof, the method known to our grandfathers is suitable - a mixture based on asbestos and cement.
The chimney is sealed with cement as follows:
- first, a mixture of cement and asbestos is prepared in a 1: 1 ratio. It is better to use fluffed asbestos, but you can also tear sheet into small pieces;
- then asbestos is mixed with water and allowed to swell so that it turns into a homogeneous mass;
- swollen asbestos is mixed with cement;
- the resulting cement composition is coated with a gap between the pipe and the roof;
- then you need to wait for the solution to dry completely, and you can heat the stove.
What factors influence the choice of sealant?
When choosing a suitable product for hydro and thermal insulation, they are guided by the conditions under which the stove, fireplace or heating boiler will be operated. It is also important to consider where exactly the product will be applied: inside the pipe, outside or at the junction of the chimney and the roof. It affects the choice of sealant and the heating temperature of the surface that is planned to be treated.
Watch video - stainless steel pipe after 2 years of operation (outer galvanized and inner stainless steel)
However, in any case, it is worth following the general recommendations that are true in all cases:
- elastic means are better suited for hard-to-reach areas and joints subject to temperature deformations;
- solid sealants are suitable for cracks and brickwork;
- sealants containing iron oxide in their composition acquire a brown tint, which masks them well against the background of a brick;
- for sealing a chimney made of metal, stainless steel or natural stone, brick, do not use acidic compounds that can damage the surface of the chimney of boilers or stove heating.
You should not save on chimney sealant, because forced regular cleanings, as well as the need to re-disassemble the structure, will bring much more costs, you won’t be able to save. In addition, a poor-quality sealant can lead to soot entering the living quarters, the formation of plaque on the walls, poisoning the residents, or even a fire.
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Despite all the efforts of roofers to lay the roofing as tightly as possible to the chimney and various ledges, leaks still remain at the junctions. Water from the roof, thus, can enter the under-roof space through the gaps formed. Therefore, all of them must be properly sealed.
One of the most discussed issues among stove builders is how to fix a pipe on a roof. At a time when stove heating was present almost everywhere, when arranging a chimney on the roof, a special thickening was made, which protected the roof from leakage. In our time, everywhere, brick pipes have given way to metal, often serial welded chimneys. It is also worth noting that modern stove-makers, choosing a brick for a pipe on the roof, do not thicken.
In order not to face the most unpleasant situation when a pipe is flowing, you need to figure out how to fix the pipe on the roof.
Gap sealing principles
The gaps are closed using various improvised materials. Schematically, they can be divided into two groups:
- Elements that close the gaps between the chimney and the roof. These are different aprons, collars, both factory-made and our own. The material for them is corrosion-resistant galvanized steel, rubber or silicone. Additional elements may differ in appearance and their technical characteristics. Functionally, their installation provides the initial rough closure of the joints.
- All kinds of sealants with which to fill the remaining gaps. For example, cement mixtures or mastics. Today, to solve these problems, more modern materials are also used, which are simple and very convenient when performing insulation work, for example, self-adhesive tapes.
How to close the gap between the pipe and the roof
As soon as the pipe is made, the roofers face the question of how to seal and waterproof the joints. , how to seal a chimney For this, various materials are used. Let's take a look at a few of the most common.
- Silicone sealant for the chimney on the roof. It is frost-resistant, waterproof material. It is easy to use and affordable. In addition, silicone sealant has a high level of heat resistance, up to 150˚ C, therefore it is widely used in the construction of baths and steam rooms.
- Bituminous mastic. The surface to be treated is pre-cleaned and dried. The mastic is applied in a layer 3 or 4 mm high. If the gap turned out to be too wide, then it can first be filled with mounting foam, and only then apply bituminous mastic.
- Ecobit. This insulating material provides fairly good waterproofing. It is a reinforced self-adhesive aluminum tape with a sealing layer of special modified bitumen. It is laid along the perimeter of the chimney.
- Enkryl. This is a German-made one-component acrylic mastic, which is used to treat problem joints. The waterproofing process takes place in 4 stages.
1. degrease the surface around the perimeter of the pipe;
2. apply the first layer of Enkryl Liquid Mastic with a brush;
3. the pipe is wrapped with Polyflexvlies Rolle (this is a viscose-based reinforcing fabric), which will provide additional elasticity to the waterproofing;
4. After 15–20 minutes, when the mastic is already absorbed into the fabric, a second layer is applied.
According to the manufacturer, it will hardly be possible to see that the roof is flowing near the pipe for 9-10 years.
How to fix a pipe on a roof from different materials
Technologies for sealing gaps depend on factors such as the type of roofing material, the size of the gap, and the shape of the smoke channel. Consider step by step the process of sealing a pipe on a roof from rain for popular coatings.
Tile roof
- The gaps formed between the roofing and the outer wall of the chimney must be overlaid with stainless steel corners. If the chimney has an oval or round shape, metal corners can be replaced with rubber seals with an adhesive base.
- A special decorative collar is prepared from galvanized sheet steel. It is put on through the head of the chimney and mounted on self-tapping screws. Thus, a space for pouring is formed between them.
- A viscous cement-sand waterproof mortar is poured into the formed gap and left for a day. This time should usually be enough for the mixture to solidify.
When filling gaps, it is necessary to ensure that the solution completely fills all possible gaps.
- To divert water from the roof, an inclined surface is formed. This is done as follows: a hole is cut out in a stainless steel sheet. Its diameter should correspond to the size of the collar. Putting a cut sheet on the head, it is attached to self-tapping screws.
Slate roof
Mortar sealing is the most affordable technology for sealing a slate roof. However, in the case of round chimneys, the use of this method is associated with certain difficulties. This problem can be successfully solved by the following algorithm.
- A sheet of polyethylene is placed on a thick cardboard and a ring is formed. It is inserted into the gap between the roofing and the chimney.
- A temporary restrictive rim is formed on the slate from some plastic material, say, plasticine.
- Asbestos-cement mortar is poured into the resulting gap.
- After the building mixture hardens, the side and the cardboard cylinder are removed.
- In their place remains an asbestos ring, which serves as a waterproofing.
Roofing from bituminous tiles
On a soft roof, cutting is usually done. The gaps are sealed using a special apron, which is framed with a flexible rubber-based self-adhesive tape, for example, Wakaflex. The tape is carefully glued to the existing adhesive layer around the perimeter of the chimney, leading it from the roof surface to the walls of the chimney. Then the cutting is pressed with a case. The gaps remaining between the flexible roofing material and the chimney are sealed with bituminous mastic.
If the dimensions of the slots are large enough, they are first filled with tow or rope. Prior to this, the material is impregnated with compounds that give it waterproof qualities. For example, use oil paint, bitumen and more. Gaps can also be filled with cement mortar.
Waterproofing a chimney on a corrugated roof
Adjacency of the profiled sheet to the chimney with a rectangular section. The most common way to seal the chimney in this case is to install an apron. This shaped element is made of galvanized sheet steel. Install it on the roof painted in the color of the roof.
- The main part of the installation work is connected with metal junction strips, which must be placed in the lower part of the chimney.
- Since the pipe is brought out through the corrugated board, as a result, the vapor and waterproofing layers are cut. They are carefully glued to the outer walls of the chimney using adhesive tape.
- A shallow strobe (about 1.5 cm) is made along its perimeter, using a special machine for this.
- Part of the junction bar, having bent the upper edge, starts a strobe and additionally fixes it on a silicone sealant with a high level of heat resistance.
With the correct laying of corrugated board on the roof of the house, it is guaranteed to avoid leaks during rains and spring snowmelt. By this criterion, one can judge the reliability of the roof. It should be remembered that any roof structure consists of many elements. The list includes valleys, front bars and a ridge. However, based on practice, the most risky element in terms of leakage is the chimney.
A few decades ago, stove-makers dealt with this problem by thickening a brick chimney. However, such work requires certain knowledge and skills, and modern structures are increasingly being built from metal. Typically, chimneys are made with a circular cross section. A simple instruction will help you figure out how to close a pipe on a corrugated roof.
Causes of leaks
The roof covered with profiled sheet must be equipped with several holes through which the chimney pipe and ventilation channels will be led out. As a result, the solidity of the waterproofing may be broken, which will increase the risk of leaks. It is rather difficult to solve this problem if the chimney had to be led out through an already constructed roof.
For high-quality sealing of the areas where the pipe adjoins the corrugated board, quite a lot of effort is required.
If the work is done poorly, many problems arise:
- Water starts to flow. This happens if the sealing of the junction of the chimney and corrugated board is poorly equipped.
- The rafter system began to rot. After water gets inside the roofing cake, the wood from which most of the roof elements are made gets wet. As a result, the structure is deformed.
- The roofing material itself begins to rust. The corrugated board is not very well protected from corrosion from below.
- Aging insulation. When the insulation gets wet, its effectiveness is significantly reduced.
To increase the reliability of the roof, you need to choose the right place for the outlet of the chimney and ventilation ducts. This will make sealing the pipes much easier.
Mounting Features
What needs to be done so that there are no leaks at the junction points of the pipe to the corrugated board? This requires proper sealing of the joints. Experienced installers note that when solving a problem, it is important to take into account the location of the chimney. The closer the chimney is located to the ridge, the less water gets to its junction with the chimney. In this case, the risk of leaks is reduced.
In addition, the pipe installed as high as possible along the slope has the smallest section located in the cold air zone. This minimizes the formation of condensate, which contributes to the buildup of soot inside the chimney. In addition, if condensation constantly forms in the pipe, the walls of the pipe are exposed to acid, which corrodes the metal.
It is necessary to separately consider different designs of chimneys in order to figure out how to arrange their joint with corrugated roofing.
Rectangular products
Today, more and more manufacturers are making sure that the joints of the roof and chimney pipes are reliably protected from water. For this purpose, special additional elements are being developed. They are installed near the valleys, ridge, pipes. Such elements are called aprons.
The main purpose of the apron is to collect water flowing down the chimney and roof slopes. With the help of such a device, moisture is diverted to the eaves into the drain system. However, during the installation process, it is important to consider one important point. You need to take care of proper waterproofing. As you know, it is imperative to lay a waterproofing film under the corrugated board. It doesn't matter if the roof is insulated or not. At the junction of the pipe to the roofing, a cut is made for the installed chimney. The edges of the cut are left with a width of 50 to 100 mm. In the future, they will be fixed directly on the chimney structure.
However, these are not all the points that need to be taken into account. At the joints, it is necessary to create a reinforced layer of waterproofing. Therefore, quite often a special tape is installed under the apron. It must be placed under the apron strips located on top. Partially the tape goes on the corrugated board. The scheme of work when creating a waterproofing layer should be as follows:
- first, the tape is applied to the lower edge of the chimney;
- after that, the joints must be sealed on the sides of the pipe structure;
- at the final stage, the upper edge of the chimney is pasted over.
Often there are situations when it is necessary to pass the stove pipe through an already created corrugated roof. This job can be done quite simply. However, one subtlety must be taken into account. It is necessary that the hole for the chimney in the roofing material be 1.5-2 cm smaller than the pipe itself. In this case, the chimney will not be able to crawl through. But for this, the edges of the corrugated board are simply cut and bent.
After installing the chimney, they will fit snugly against it. This allows you to create additional protection of the joint from leaks. In this case, under the corrugated board, it is imperative to mount the bottom bar of the apron, and on top - the waterproofing tape.
Pipe connection in the ridge
The easiest way to seal the joint of a pipe with a corrugated roof is if it is drawn through the ridge. This improves the reliability of the connection. In such structures, the formation of snow pockets is impossible. The risk of leaks arises precisely when they are present. Such options also have one significant drawback - to pass the pipe through the top of the roof, the ridge element should be divided. This means that two additional posts must be installed under the edges of the plots. You can seal the junction with an apron. However, it must have a specific configuration. Such an element is made of smooth metal sheets.
Attention! Often the space between the corrugated board and the apron is filled with a silicone-based sealant. Modern manufacturers offer the consumer to use self-adhesive tapes that are made of butyl rubber.
The upper junction zone between should be sealed by the standard method - using the upper elements of the apron, sealed from above with a sealant. The silicone composition is not afraid of high temperatures.
The joint of the pipe and corrugated board on the slope
Not in all cases, the layout of the building allows you to bring the chimney through the roof ridge. Therefore, another path is chosen - to make a hole on the slope. In this case, the work on sealing the junction becomes much more complicated.
The main goal is to properly install the top element of the apron. Therefore, the basic rule is the installation of this element under the corrugated board.
Attention! If the upper side of the chimney structure has a width of more than 80 cm, a shaped apron with a ramp is installed on it. This design is reminiscent of a breakwater that diverts water in different directions from the chimney.
The installation of such an apron is associated with certain difficulties. In addition, at the junction of its elements and corrugated board, two valleys are obtained. They need to be sealed in the same way as roof valleys. This requires the installation of additional slats and increased waterproofing.
round pipe
Many chimney structures for stoves are equipped with round channels made of metal sheet. Such products are multi-layered and additionally insulated. Such a pipe is sealed in many ways. It is worth sorting out the most popular:
When a residential attic is located under the roof of the house, the pipe passage must not only be sealed, but also carefully insulated. The gap formed between the apron and the pipe must be closed with a special heat-resistant gasket. It is attached to the plane of the product.
As you can see, you can equip the joint of the roof from corrugated board with a chimney yourself, knowing the installation features of various structures. In the process of work, it is important to follow the technology. This will ensure the sealing of the junction.
How to make a passage in corrugated board without disturbing the truss system
If the insulated roofing pie has already been completed, there will be many problems with passing a chimney through it. The main difficulty lies in compliance with fire safety requirements. At the same time, it is necessary to maintain the integrity of the vapor and waterproofing.
The chimney structure should be placed at some distance from the wooden rafters. Therefore, the passage of the pipe through the corrugated roof is created in a special box, which consists of rafters located next to the chimney. Two beams are fixed between them. They are placed above and below the chimney structure. From cross beams and rafter legs to the chimney structure, it is selected in accordance with fire safety standards. This indicator is in the range from 130 to 250 mm. It depends on the material from which the chimney structure is made.
The inside of the box must be filled with insulation with non-combustible properties. usually used high-density material made using basalt fiber. It has low hygroscopicity, in comparison with conventional heaters.
To ensure the tightness of the roof, it is necessary to cut through the corrugated board with an envelope on the hydro- and vapor barrier at the place of the pipe passage. Its edges should be fixed outside the wooden box.
To cut the corrugated board under the pipe in the place where it will be carried out, a continuous crate should be created. Thanks to this, it will be possible to firmly fix the lower abutment bar and the roofing material near the walls of the chimney structure.
conclusions
The choice of method for sealing the junction of the pipe and corrugated board depends on the shape of the chimney and the features of the roof structure. You can create a reliable connection using an apron (for rectangular structures) and additional elements (for round sections).
The choice of the location of the chimney outlet is also of great importance. The lower the pipe is located along the slope, the more water accumulates at the joints. This increases the risk of leaks. The best option for the location of the chimney opening is in the ridge of the roof or not far from it.
By following the technology of sealing the junction of the pipe and corrugated board for certain chimneys, it is possible to reliably protect the roof from leakage. It is especially important to do this if there is a warmed veranda.
With all the efforts of roofers to lay the roofing material closer to the pipe, it still adjoins it loosely, with gaps. If they are not sealed, then water through such joints will seep under the roof. Therefore, all gaps between the roof and the perimeter of the chimney must be sealed.
Brick chimney on roof with rigid metal roofing
How to close up the roof around the pipe on the roof of metal tiles, seam roofing or corrugated board?
Consider the termination method for a rectangular brick pipe.
- The traditional method of termination involves the installation of an apron around the pipe from four special L-shaped elements made of galvanized steel. Ready-made junctions are applied to the pipe and a construction marker is marked directly on its walls where the strobes will pass under the upper bends of the junctions.
- To form strobes, they pass along the marked lines with a cutting machine with a disk over the stone. The installation of the apron begins with the installation of the lower junction, while leading its upper limb directly into the strobe.
- Similarly, with an overlap: side and top abutments are installed. In this case, the lower horizontal parts of the junctions are attached to the crate with self-tapping screws.
- The strobes on the pipe are sealed with silicone sealant.
- Then they arrange the so-called. A "tie" made of waterproofing material, installed directly on the lower junction and so that moisture flows into the drainage elements of the roof.
- Roofing material is mounted on top of the junctions and the "tie".
Round chimney roof with rigid metal roofing
- Many stove manufacturers produce round multilayer chimneys. To seal such a chimney on the roof, there are ready-made aprons-caps, which are a metal sheet with a hole closed by a cap in the form of an inclined (with respect to the plane of the sheet) truncated cone. The sheet is attached to the crate, the pipe is passed through the cap. The top of the cap is pressed against the pipe with a steel clamp with a heat-resistant gasket.
- In addition to rigid metal aprons-caps, there is also a special flexible pipe seal on the market called Master Flush. This is a flexible device that allows you to close pipes on the roof quickly and with good quality. The scope of its application is the sealing of not only chimneys, but also various other additional elements of roofs, such as: antennas, ventilation pipes, lamps.
Outwardly, Master Flash looks like a stepped pyramid. The materials for its production are silicone or rubber, the base is made of aluminum. It should be remembered that the operating temperature range of rubber Master Flash is – 50°C - (+ 130°C). In more detail about the chimney, he will tell.
The silicone model operates in the temperature range of -70°С−(+250°С) and can be used on any roof and in any climate.
The described material is easy to install and has a long service life.
- A hole with a diameter slightly smaller than the diameter of the pipe should be cut into its base.
- Pull the Master Flash onto the pipe, give it the correct shape, put a gasket under the base.
- Under the base, apply a layer of special sealant along its edge, and attach it to the corrugated roof with special screws.
- If the seams between the roof and the pipe still leak, then it is good to seal them with aluminum or copper self-adhesive tape with an adhesive layer based on polymer-modified bitumen and covered with a protective film. Such a layer does not need to be preheated, it is well bonded to wood, metal, plastic, cement screed and other materials. Previously, the place where the tape will be attached is cleaned, and after removing the protective film, it is strongly pressed against the surface. It can glue the attachment points of the apron-cap to the roof sheathing.
Round chimney roof with natural tile roofing
On such a roof around the pipe, the so-called. "otter" from a cement-sand mortar in the following sequence:
- In the gap between the pipe and the tile, galvanized “collars” are laid.
- A cement-sand mortar is laid in the prepared gap, forming a collar protruding above the roof around the pipe. The lower extended part of the collar should fit snugly with the tiles, and the upper part with the pipe.
- For drainage, a protrusion is formed on the collar from the side of the ridge, having two inclined planes.
This work must be done with all possible care to prevent cracking.
Round pipe on slate
When the pipe is located close to the ridge, it is sealed in the following sequence:
- One of the steel sheets, which forms the ridge, is lowered up to the overlap of the pipe section.
- A round slot is made in the sheet for the pipe with a flanging of its edge two centimeters upwards.
- An asbestos-cement ring is put on the pipe.
- To fix the ring along the height of the pipe, insert the pin into its side hole.
- The ring with a wedge is installed parallel to the slope.
- The edges of the slot in the steel sheet lead inside the ring.
- Cover the joint with a mixture of cement with fluffed asbestos (1: 2).
In order for the pipe and slate to be hermetically joined, do the following:
- A cardboard cylinder wrapped in plastic wrap is inserted into the gap between the slate and the pipe.
- A clay or plasticine border is molded on a steel sheet. The distance between the side and the cardboard cylinder should not be more than 10 mm.
- The resulting gap is filled with asbestos-cement mixture.
- After the mixture has hardened, the cylinder with the restrictive side is removed;
- An asbestos ring is put on the pipe (see above).
Waterproofing the pipe exit (video)
Seal pipe on a soft roof
Around brick pipes on a soft roof, cutting is carried out in the form of an apron from ready-made junctions made of soft roofing material (for example, ondulin). The junctions are attached to the crate with nails, and to the walls of the pipe with Wakaflex or Onduflash-super roofing tape. The junctions of the junctions with the crate are also glued with the same tape.
Round pipes on a soft rabbit are closed with ready-made aprons-caps. The joints of the base sheets of the aprons with the roof are also glued with roofing tapes.
As you can see, there are quite a few ways to fix a pipe on a roof. They have one thing in common: all these works must be done with high quality. Only in this way will you get reliable protection of the roof from leakage.
The popularity of fireplaces and stoves in country home furnishing has not waned since the advent of more modern heating appliances powered by natural gas or electricity. Chimney pipes are used to remove the products of combustion of furnace equipment: their passage through the roof must be as tight as possible.
What happens when there is insufficient sealing
The area where the chimney exits through the roof surface is called the passage node, or simply the penetration. It is installed in the wall or on the roof of the building: it is the second installation method that is most popular. At the same time, it is much more difficult to carry out high-quality waterproofing of such penetration.
All mistakes made in sealing the pipe on the roof can provoke the following consequences:
- leaks. According to statistics, the cause of most roof leaks is precisely poor-quality waterproofing of the areas where the chimney and roofing material adjoin.
- Rotting roof structure. Moisture that has got under the roof through a poorly designed passage unit causes decay and deformation of the wooden truss structure.
- Thrust reduction. Due to the weak tightness of the area of \u200b\u200bcontact between the roofing and the chimney, condensation begins to form on the surface of the latter. As a result, the chimney cools down and reduces the internal draft.
In order to eliminate all of the above problems, it is necessary to carefully observe the technology of sealing the penetration of the chimney. The kit of almost all roofing materials includes special additional elements or elastic casings, which allow for high-quality insulation of the specified area.
The purpose of waterproofing pipes on the roof
The waterproofing of the chimney is usually carried out upon completion of roofing work, which provokes a negligent attitude towards this procedure by some craftsmen. This state of affairs is a serious mistake, the consequences of which can be very deplorable.
The tasks of sealing the chimney pipe:
- Increasing the safety of furnace equipment. Chimneys serving solid fuel stoves are usually heated to very high temperatures. This imposes additional responsibility on the isolation of its surface from the wooden roof structure.
- Improving Energy Efficiency. If you carry out high-quality insulation of the seams, thereby you can significantly reduce heat loss. As a result, significant savings in fuel materials will be achieved.
- Pipe protection against condensate. A well-insulated chimney is able to maintain a stable temperature of its walls. This makes it possible to reduce the amount of condensate formed by an order of magnitude.
What should be waterproofing
Not so long ago, the waterproofing of the exit point of the chimney was carried out with improvised materials. At present, for these purposes, a significant number of materials and devices are being produced that allow solving the problem of how to close the gap between the pipe and the roof.
Waterproofing for penetration should have the following qualities:
- Persistent moisture transfer. Since this area is located on the surface of the roof, this implies constant exposure to atmospheric precipitation. Therefore, it is very important that the insulating material be able to resist moisture and corrosion for a long time.
- Heat resistance. The surface of the chimney can be heated up to +600 degrees, so the waterproofing must perfectly cope with significant temperature fluctuations. Constant exposure to the sun means that the roof chimney seal has good UV resistance.
- Wear resistance. As a rule, any roofing material is designed to operate for at least 15-20 years. It is desirable that the additional elements have a similar service life.
- Roof compatibility. Before sealing the pipe on the roof, it is important to choose the best option. The selection of material for the design of the exit point of the chimney is carried out taking into account the type of roofing material. A roof made of corrugated board or metal tiles must be equipped with galvanized additional elements. Ceramic products are used on tiled roofs, and bituminous products are used on soft ones.
Do not waterproof the pipe with household silicone sealant, petroleum bitumen, or cement. When selecting insulation, the heating temperature of the pipe and the type of roofing material should be taken into account.
What are the means for sealing - the better to close the gap
Thanks to the ready-made pass-through units of the chimney pipe, roofing work is greatly simplified. These tasks can be performed even by people without relevant experience.
The main types of means for sealing penetrations:
- Metal collar for roof pipe. The most popular type of chimney insulation. Most often, square or rectangular pipes are equipped in this way. Such an apron consists of a set of metal corners that are fixed to the roof slopes and the outer walls of the chimney. This option is usually used on roofs made of corrugated board, metal tiles or slate.
- Rubber inserts. We are talking about seals made of rubber or latex, having a funnel-shaped design. This form of products is convenient for insulating chimneys with a round cross section. They are pulled onto the pipe, fixing to the crate through the roofing. To achieve a snug fit of the rubber liner to the surface of the chimney, it is important to correctly select its diameter.
- membranes. Using strip diffuse membranes, it is convenient to glue the perimeter of the chimney. Thus, it is possible to design pipes of round and rectangular cross-section. In fairness, it must be said that this type of termination is not very aesthetic.
To achieve reliable waterproofing for penetration, it is recommended to use multi-layer structures, where a rubber seal, an inner apron and an outer decorative edging are combined.
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