Heating devices, providing a comfortable thermal regime in the house is a dire necessity. The explanation for this lies on the surface, in most regions of our country winter period lasts about 9 months and that is why stoves, fireplaces, etc. are installed in many houses. But it must be remembered that such devices represent a source of increased danger and there are often cases when a fire occurs due to improper chimney design. A correctly executed chimney passage through the roof will ensure maximum safety of the building.
Passage through the roof. View from the attic
What are the dangers of improper chimney installation?
Before installing a chimney through the roof, the homeowner must understand what consequences can be expected in the event of errors made at the design stage or direct installation.
If the pipe on the roof does not provide the necessary tightness, then the moisture that will accumulate there will sooner or later lead to the destruction of the brick chimney body. Availability excess moisture creates in the chimney favorable conditions for the growth of mold and other harmful microorganisms. Water getting into the chimney leads to a decrease in the parameters of the insulation and after drying, this material will never be restored. In addition, as a result of mistakes made during the installation of the chimney, the rafters may also suffer. Since moisture that gets into the chimney can lead to the development of areas of rotting on their surface. One of the most common mistakes when arranging a chimney outlet is the presence of cracks that lead to disruption of the air movement inside the roof.
Only a small list of troubles that can await a homeowner who decides to independently install a chimney through the roof is indicated. Therefore, it makes sense to invite specialists to carry out such work who can both choose the right location and decide which method of exiting the chimney through the roof will be optimal.
How to choose a location for the pipe outlet
In order to perform the correct passage through the roof, it is necessary to observe a number of simple conditions, defined by the rules. The chimney pipe should be placed at a distance of 1 to 1.5 m from the top of the roof. The height of the pipe relative to the highest point should be in the range from 0.5 to 1.5 m. The draft will reach its maximum if the maximum permissible pipe height is used. In general, when determining the diameter and height of the pipe, you must be guided by the requirements determined by the manufacturer of the heating device.
The chimney on the roof is a set of pipes located in vertical and horizontal planes and passed through the ceiling. At the same time, the length of horizontal sections should not exceed 1 meter. The pipe outlet must be placed between the components rafter system in such a way as to reduce the likelihood of a significant increase in the temperature of surrounding elements. Otherwise, the preconditions will be created for the emergence of a fire.
Penetration for a chimney pipe - when is its installation required?
Passage through the roof is performed in the following cases:
- construction of a new building;
- carrying out major roof repairs;
- arrangement of heating devices, including stoves, in an existing building.
When constructing a new building, there are no difficulties with installing a chimney. All necessary solutions laid down at the design stage. Questions about how to install a chimney through the roof begin to appear when the homeowner decides to install an additional heat source (fireplace, boiler, etc.). He must resolve many issues related to the arrangement of hydraulic insulation and carrying out activities related to ensuring fire safety designs. Of course, he must know how to properly bring the pipe to the roof.
By the way, as an option, some country property owners build chimneys running along the walls of buildings with their own hands. This solution is acceptable if the installed heating equipment runs on liquid fuel. Residents will be deprived of the opportunity to inhale fumes emanating from fuel and its combustion products.
Consequences of passing through the roof
The passage of the chimney through the roof must ensure fire safety. The gases generated during fuel combustion create a high temperature in the chimney, which can cause fire in the roofing elements. This is especially true for systems constructed from materials with low fire resistance. So, if the supporting roof system is made of wood, then additional sheathing must be installed in the place where the pipe passes.
Taking into account that many roofing materials contain polymers that are not highly resistant to fire, the pipe must be protected by thermal insulation and the distance between it and the edge of the material that can catch fire must be at least 13 centimeters. If the pipe is not equipped with thermal insulation, then this distance should be increased to 30 cm.
The passage of a pipe through the roof violates the integrity of the coating, including layers of thermal and hydraulic insulation. If you do not ensure high-quality cutting of the roof around it, then, most likely, the insulation will get wet, with all the ensuing consequences.
In addition to reducing the parameters of hydraulic and thermal insulation, there is a decrease in strength truss structure. This can happen if the installation of a chimney is done with your own hands in a building that is in use.
Options for passing a brick chimney through the roof
There are several ways to route a pipe through the roof. If the pipe is made of brick, then a hole must be made in the roof, the size of which should be 25 centimeters larger than the cross-sectional area of the chimney. If the roofing material is not flammable, then this size can be reduced. The main thing is the correct passage of the chimney through the roof.
The passage through the tiled roof is additionally equipped additional design, consisting of rafters and sheathing. Between the chimney and wooden structures it is necessary to lay non-combustible material; as a rule, mineral wool is used for this. In addition, the wood used to construct the roof must be treated with compounds that prevent fire and rotting.
IMPORTANT! If, when installing a chimney outlet, it rests on a ridge beam, then it must be cut and the free ends installed on vertical posts.
It is necessary to make a metal apron on the roof, one edge of which should be placed on the chimney itself. And the other end should be hidden under the roofing material. This design is acceptable for chimneys located away from the ridge. If the pipe is located in close proximity to the ridge beam, then a protective apron must be placed under it. At the same time, it must be secured with fasteners and treated with a moisture-resistant sealing compound.
Wiring using elastic materials
As usual, when constructing private houses, one has to deal with the installation of pipes made of metal. To ensure the tightness of the passage of the pipe through the roof, a device called elastic penetration is used. To manufacture this device, use polymer materials, for example, silicone or rubber. This part is made in the form of a funnel, at the base of which a square or round shape. The physical and technical properties of this part allow it to take the shape that the slope forces it to take. In addition, the elastic penetration is resistant to high temperatures, chemically aggressive substances, etc. The use of various pigments in the manufacture of this part allows them to be produced in different colors.
The passage of the chimney pipe through the roof is an important part of the installation.
When choosing an elastic penetration, the consumer should be guided by the diameter of the pipe and the color of the roof. Such parts have the shape of a funnel or pyramid. They are suitable for most chimney diameters through metal tiles and other materials.
Installation of this part is quite simple. To do this, it is necessary to cut a hole in its body equal in size to the diameter of the pipe. Then you need to put it on the pipe and, using a metal ring with holes for fasteners, fix it to the roof surface. Of course, the outlet connection must be treated with a flame-resistant sealant or a chimney roofing sealant must be used. For roofs with a steep slope, specially made elastic cones are used. By the way, such parts are used when arranging a chimney through corrugated sheets.
Metal pipe
On the construction market you can find another version of these products made from metal sheet alloy steel and intended for the outlet of the chimney pipe. Finished goods, as a rule, are performed with a standard slope angle. They are used for roofs on which flat roofing material is laid. To install this part, you need to cut a hole of the required shape in the roof surface. To create a hole, you can use a corner grinder or roofing scissors. After this, it is necessary to remove layers of hydro- and thermal insulation from it. On the back side of the roof it is necessary to fix a sheet of fire-resistant material in which a hole has already been made in advance.
Then, the chimney component must be inserted into the holes made and docked with the already installed chimney module. A clamp must be put on and tightened at the connection point. The outlet pipe must be installed on the chimney pipe and fixed to the surface of the slope. In this case, we must not forget to treat the joint with a fire-resistant sealant. After the last outlet segments are installed on the assembled connection, and their height will be 0.5 - 1.5 meters, the work on creating the passage can be considered completed.
Rectangular pipe outlet
Stoves, fireplaces and some other heating systems most often have rectangular (square) shaped chimneys. To properly remove the chimney, you must perform the following operations.
As the chimney is brought to the roof, a hole is cut out in it, the dimensions of which should have an allowance of 2 - 5 cm on the side of the hole. Through it, a conclusion will be made to the roof. The equipped passage must be lined with asbestos or mineral wool. For this you can use asbestos sheets. They will protect the passage unit, for example, through an ondulin roof, from fire under the influence of high temperatures emanating from the chimney. After the pipe is brought outside. It is necessary to lay a layer of waterproofing around its base and cover it with an apron made of bent aluminum sheet. These sheets are called additional elements, and their color must match the color of the roofing material.
Output box
Finishing the pipe on the roof can be done using a special box. The roof is made of several types of material that have varying resistance to flame. And therefore for safe withdrawal via wooden wall a special box will be installed on the roof. It is made of fire-resistant material with dimensions that must correspond to the size of the chimney. The distance between the walls of the box and the exhaust pipe of the chimney must be at least 15 cm.
After installing the box in its place, its upper edge is compared with the level of the roof slope. To increase its protective properties, expanded clay or similar material is poured into the space between the chimney and the duct.
As you know, penetration through the roof looks like a passage unit, which is used to install steel ventilation shafts at their locations in roof coverings of structures of various designs and purposes.
Next we will talk about what types of roofing penetrations there are, as well as the features of their design and use. Thus, the roof penetration should be located on reinforced concrete glasses. It is fixed by screwing nuts onto the anchor bolts provided in the design. Thermal insulation material protrudes a plate consisting of mineral wool and fiberglass.
A special mechanism that regulates valve control has two functional operating modes:
- "open";
- "closed".
Under no circumstances should the valve driving mechanism be positioned lower than the ring coupling, as this may cause condensation to accumulate in the system.
Typically, roof penetrations are installed in buildings that have one of two types ventilation systems:
- natural ventilation;
- forced ventilation.
Also, in the process of designing a particular structure, the choice of a particular ventilation system has a huge influence whole line factors, which include, for example, humidity levels, highest and lowest air temperatures, etc.
In this case, roof penetration is calculated by considering two main indicators:
- Roofing angle.
- Interval from penetration to roof ridge.
Part pass-through node includes a pipe connected to the support flange. This flange performs fastening functions and is used to fix the roof penetration to the reinforced concrete glass. The flange located at the bottom serves to secure valves and air ducts, while the top one is used when a shaft with a circular cross-section is used. To fix the braces located on the roof covering, it is necessary to use special brackets, and clamps should be used for this in the shaft.
Performance properties of roof penetrations
If the roof passage has manual drive, then it should work stably so that there is no need to switch modes from time to time.
Typically, a manual drive consists of:
- tailor's cloth;
- control mechanism;
- cable;
- counterweight.
Additional protection The installation of a system element such as a skirt will prevent water from entering the roofing. If necessary, roof penetrations can be equipped with a special element, the purpose of which is to collect condensate. This part can simply be welded to the pipe, and then it will prevent moisture coming from a mixture of gases and air from penetrating under the roof.
There is also a certain number of factors that directly affect whether both a conventional penetration and an angular roof penetration will work normally. According to this series of requirements, you first need to decide on the design of a certain unit in accordance with climatic conditions, and then take into account other options, for example, whether it will be possible to use a sealant for the roofing unit and in what quantity it can be used.
When making roof penetrations, it is customary to take black with a thickness of 1.5 to 2 millimeters as the main material.
Roof passage units can also be mounted using stainless steel, which comes in two categories:
- stainless steel, having a thickness of 0.5 millimeters;
- stainless steel having a thickness of 0.8 millimeters.
On this moment In production there are 11 options for the size of roof penetrations. However, sometimes manufacturers can create samples that differ from standard diameters and are intended for different systems.
The main purpose of roof penetration is to correctly install the ventilation system on the roof of a certain structure. This significantly improves air circulation and makes operating conditions more comfortable.
Today there is also a wide choice supply systems, during installation equipped with high-quality sound insulation.
What are roof penetrations made of?
The design of standard units includes two main parts, and those, in turn, consist of external and internal circuits, each of which has a special insulating layer made using basalt fabric, resistant to fire and temperature changes.
Typically, roof penetrations consist of black steel, 1 to 3 millimeters thick and coated with black enamel that is resistant to high temperatures, thanks to which the nodes are able to withstand impacts up to 600 degrees. According to some operational standards, and also technical specifications and according to the wishes of the developer, stainless steel can also be used as a material for penetrations. Its thickness can be from 1 to 2 millimeters.
The production of roof penetrations must be inextricably linked taking into account three following criteria:
- Roofing angle.
- The thickness of the space under the roof, as well as the roof rafters.
- Materials used as the basis for the construction of the rafter system, the ceiling of the building and the roof itself.
To prevent moisture that appears after precipitation from penetrating through the roof penetration, it is necessary to use special “layouts”, which look like a metal strip equipped with a hole intended for the chimney and a special side flange. The material for the “layout” is usually polyester, and it will be correct to use the color that matches the color of the roof covering. This element is located between the roof ridge and the passage unit, which should be covered by a “layout” on each side.
Installation of roof penetration, detailed video:
- The choice of seal ring is made on the basis of a calculation according to which the diameter of the resulting hole should be approximately 20% smaller than the diameter of the pipe going through the roof.
- The seal itself is pulled directly onto the pipe. If difficulties arise, you can use a soap solution.
- The seal is shaped into the base by pressing it against the roof. Tools can be used to secure the flange edges.
- A special sealant is applied to the space under the flange.
- The flange is fastened with screws, which should be at a distance of 35 millimeters from each other.
This completes the installation of the roof penetration.
This data should be used when bringing ventilation and chimneys to the surface of the roof. It is important to remember that when using roofing penetrations, this can be done not only simply, but also efficiently, moreover, it cannot cause any harm to the roof itself. If desired, any installation information with detailed photos and a video of the entire device process can be easily found on our website.
The roof structure includes many structural elements: Basic structure the entire roof, an insulating layer, a layer of hydro- and vapor barrier, various accessories, which include roofing penetrations.
Reliability" roofing pie"is ensured by the reliability of each element.
The function performed by the passage unit is to ensure a tight connection between the various through elements and the roof.
More recently, the issue of the tightness of chimneys and other elements was solved with ingenuity and tow, but now various manufacturers offer wide range standardized units that ensure tightness in any climatic zones and conditions.
It goes without saying that the roofing masonry must be sealed over the entire area - the moisture that forms during the formation of condensation will not damage the roof and will remain on the roofing.
If moisture gets inside, it can destroy the structure of the roof when it freezes.
To avoid this, it is necessary to arrange under the roof thin layer ventilation.
To ensure that communications laid through the entire thickness of the roof are airtight, roof penetrations are used at the joints.
It completely eliminates the possibility of moisture penetrating under the roof.
Roof penetration is usually called special structural units that seal all pipe structures, antennas, air ducts, etc.
Design in general view is a metal or polymerized pipe that is inserted into a reinforced concrete sleeve in the roof.
Wall thickness metal structure should be no more than 1 millimeter.
Sometimes metal cups are used instead of reinforced concrete bushings.
When laying reinforced concrete bushings, it is necessary to use a roof with already marked and made holes.
Types of roof penetrations
First of all, it depends on the type of possible communications:
Roofing corner penetration
- pipelines, flagpole;
- sewer drain ventilation, which is installed to prevent sewer odor;
- various hatches in the roof, which are made for the purpose of access to the roof for repair work and chimney maintenance;
- ventilation device interior spaces dwellings.
- pipelines and air ducts for under-roof ventilation to remove excess moisture;
- For chimney.
Passage nodes can have different sections.
This depends on the type of roof and the type of roofing installed.
By type they distinguish:
- square;
- round;
- rectangular;
- oval.
The roof penetration controls air flow using the following means:
- a device without valves, when air circulation is constant;
- valve hand-held device, which can be opened or closed at any time;
- remote valve device with automation capability.
The following roof parameters influence the choice of roof penetration:
- roofing and its size;
- the distance from the ridge to the roof slope and to the place where the penetration will be organized;
- the slope and its angle of inclination relative to the ridge;
- Availability attic space and its area;
- materials from which the roof is constructed;
- size of communications for connection.
All of the listed criteria are very important; each item must be taken into account, otherwise difficulties may arise at all stages of installation.
Universal penetration
In addition to specialized ones, you can also buy universal products.
Most often they are used to seal joints for antennas and lamps.
The universal design is a stepped corrugation, which is shaped like a pyramid.
The expansion of the corrugation is fixed into a rigid polymer flange, and narrows towards the end.
The upper half is made of silicone, and the flange can be made of aluminum when a more rigid fastening is required.
The main advantages of this design include the following:
- reduce vibration from wind;
- ensure tightness of electrical connections of lamps, protect against oxidation;
- ease of installation, aesthetics.
In addition, such penetrations are resistant to damage and exposure to sunlight, and are carried out in various color ranges.
Borge
Borge's range of penetrations is represented by two types of products:
- straight type for roofs without a slope or with a minimum slope;
- For pitched roofs at an angle of 20 degrees.
Positive sides:
- durability of use, excellent quality indicators. Aluminum and polymer rubber are very resistant to temperature changes from minus 60 to plus 70 degrees.
Also this species penetrations are not afraid of acid rain, corrosive environments and ultraviolet radiation;
- installation does not require special skills. Requires simple calculations and a minimum of tools;
- huge range of designs;
- This penetration has five color varieties and an attractive aesthetic appearance.
Master flush
This penetration can be applied to any type of roof - slate, tiles, metal roof, pouring bitumen or tiles.
Ideal for sealing stove and fireplace chimneys. 
Used for straight roofs and for sloped roofs.
This type of product is an excellent combination of price and quality.
Master Flash is distinguished by high professional reliability and functionality - this is achieved through the use quality materials for use.
The main feature of this penetration is the use of reinforced polymer rubber, which can withstand heavy loads (temperatures up to 138 degrees).
Polymer rubber does not become more flexible due to heat.
Installation features
The roof penetration for the organization of the chimney must meet all fire safety requirements, since the process of removing smoke from combustion is accompanied by heating of the chimney. The temperature is transferred to the roof.
To prevent the roof from overheating, a penetration is installed around the chimney.
Fire requirements apply mainly to roofs that are made of wood, but the following requirements apply to all roofs without exception with a roof penetration:
- there must be a mandatory gap between the roof and the chimney, in which a diametrical penetration is installed that removes the temperature;
- the chimney at the junction with the roof is treated with asbestos or other non-combustible material;
- the glass of the roof penetration is filled with non-burning heat-conducting material, something like mineral wool.
Typically, the chimney passage unit is installed on a ridge or any slope.
As a rule, when installing a penetration on a ridge, the rafter system changes, and when installing on a slope, excess snow may accumulate behind the chimney.
A sealed layer is installed under the ridge beam.
The correct choice of this useful accessory will ensure the tightness of the entire roof, and this is very important factor, which affects the integrity of the entire roof.
Using this article will allow the builder to use the necessary products and learn the skills to use when making selections.
Video about the installation of roof penetrations.
Sergey Novozhilov - roofing materials expert with 9 years of experience practical work in area engineering solutions in construction.
In buildings with stove heating, such as a private house, bathhouse and others, the construction of a chimney and the organization of its outlet to the outside are required. When arranging the passage of a pipe through the roof, it is necessary to comply with certain standards to ensure safety and preserve protective properties roofs.
Chimney passage through the roof
The chimney is designed to remove fuel combustion products (coal, gas, firewood, peat) and form stove draft. The method of exiting the pipe through the roof is determined at the design stage. The main condition for this is to ensure the fire safety of the roof, especially at its junction with the pipe, as well as to protect the joint from the ingress of atmospheric moisture and the accumulation of condensate. The height of the pipe is determined by SNiP standards and depends on the distance at which it is located from the roof ridge:
- if the distance from the center of the pipe to the ridge is no more than 1500 mm, then the height of the pipe above the ridge should be no less than 500 mm;
- when the distance between the center of the chimney and the roof ridge is from 1500 to 3000 mm, the height of the pipe coincides with the height of the ridge;
- if the distance exceeds 3000 mm, the height of the chimney should not be lower than a line drawn from the ridge at an angle of 10°.
The height of the chimney pipe is determined by SNiP standards and depends on the distance to the roof ridge
The shorter the distance from the pipe to the ridge, the greater the height of the pipe should be.
Chimney passage unit
This element can be located in different places on the roof. One of the preferred options by roofers is to pass the chimney directly through the ridge. This method is characterized by the easiest installation and avoids the accumulation of snow above the pipe wall. The disadvantage of this arrangement is that it reduces the strength of the rafter system, in which the ridge beam is either absent or sawn and secured with two supports on the sides of the pipe outlet, which is not always possible to implement.
The chimney outlet through the ridge is different simple installation, but can compromise the strength of the rafter system
Most often, the pipe is located near the ridge. This way the chimney is least exposed to cold, and therefore condensation accumulates inside. The disadvantage of this arrangement is that the closer the pipe is to the ridge, the greater its height, which means that construction will require additional funds.
Exiting the chimney at a short distance from the ridge is the most common and convenient option.
It is not recommended to route the chimney through the valley, as snow can accumulate in these places, which will lead to a violation of the waterproofing and the occurrence of leaks. In addition, it is difficult to organize a chimney duct at the junction of the slopes. You should not place the chimney at the bottom of the slope - it can be damaged by snow coming off the roof.
The material from which the pipe is made also affects the organization of its outlet system. Typically pipes are made of metal, asbestos cement or fire bricks, but sometimes ceramic ones are also found. The methods of waterproofing them will be different. In addition, each type of fuel has a certain combustion temperature, and this must also be taken into account when constructing a chimney.
Depending on the shape of the chimney pipe, the outlet hole can be square, round, oval or rectangular. To protect the roof covering from high temperatures and protect it from fire, a box is installed around the chimney. This happens as follows:
- Additional rafters are installed to the right and left of the pipe.
- Horizontal beams are laid at the bottom and top at the same distance and of a similar cross-section. The distance between the box beams and the pipe walls is determined by SNiP and is 140–250 mm.
- Inside the box is filled with non-flammable insulating material, for example, stone or basalt wool. It is not recommended to use fiberglass due to its high flammability.
The space of the box should not be filled with fiberglass - it can ignite under the influence of high temperatures
It is necessary to take into account that the construction of the box may disrupt the ventilation of the under-roof space, so additional ventilation systems can be installed.
Video: installation features of the chimney passage unit
Features of chimney outlet through different types of roofing
When arranging the passage of a chimney pipe, you need to pay attention to protection from precipitation that will flow down the pipe and roof. To moisture-proof the connection between the pipe and the roof, a protective apron is installed around the chimney. This technology is similar for roofs with different coatings.
Metal tile covering
Metal tiles are a popular roofing material consisting of thin steel, aluminum or copper sheets coated with a protective layer.
Output of a square or rectangular pipe
If the pipe is made of brick and has a square or rectangular cross-section, you can use the materials included with the coating to pass it through the metal tile roof. Since brick chimneys can have non-standard dimensions, before removal, part of the covering sheets is removed or a hole of a larger area is cut out.
To waterproof the joint, special elastic tapes with an adhesive layer applied to one side are used. One edge of the tape is glued to the base of the pipe, the other to the roof sheathing. The edge is fixed at the top with a metal strip, which is attached to the pipe wall with heat-resistant dowels. All joints are coated with sealant.
To reduce the likelihood of water flowing down the chimney wall, you can make a recess under the bar - a groove
Apron for square or rectangular pipe It is possible to do it yourself. It is made from a smooth metal sheet of the same color as the main coating. The upper edge of the apron is tucked under the row of metal tiles located above so that water flowing from above does not fall under it. If the pipe is located close to the ridge, the edge of the apron can be tucked under the ridge or bent to the other side. To protect the passage opening from precipitation, a tie is installed under the apron.
It is better to organize the outlet of the chimney before laying the metal tile covering.
Conducting a round pipe
When leading a round chimney or sandwich pipe through a metal tile roof, roof penetrations are most often used, connected to a cap through which the pipe is routed. A neat round hole is cut in the coating according to the size of the chimney, a universal glass or master flush is placed on the pipe, and the joints are sealed.
To seal the joint between the round pipe and the roof, special penetrations are used
Video: sealing the passage of a brick pipe through a metal tile roof
Corrugated roofing
Profiled sheet is one of the most common roofing materials. But a leak can also occur in it if the chimney outlet is not arranged correctly. With this type of coating, it is better to place the chimney vertically. The hole in the roof is cut with a grinder, and it is necessary to ensure that the cut edge of the corrugated sheet is without jagged edges.
Carrying out a rectangular pipe
If it is necessary to organize a passage for a rectangular or square pipe, the apron can be made from galvanized sheet.
- 4 strips are cut out of metal, which will be placed in front, behind and on the sides of the pipe.
- A sheet of galvanized steel is laid from the bottom edge of the chimney to the eaves. This element is called a tie and is subsequently covered with roofing material.
- The planks are tightly attached to the pipe, their lower part is fixed to the sheathing, and the upper part is placed on the chimney.
- A groove is made in the wall of the pipe into which the curved edge of the strip is inserted. First, the bottom bar is installed, then both sides and the top. The sheets are folded under one another.
- Before laying corrugated sheeting, the passage of the chimney must be waterproofed. You can use regular waterproofing film, which is cut with an “envelope” and glued to the pipe, but it is optimal to use self-adhesive waterproofing tape.
The upper bar adjacent to the pipe is filled with sealant
Round pipe outlet
When a round pipe is routed through a corrugated sheet covering, roll bitumen waterproofing or foil bitumen tape is used. A roofing penetration is put on the chimney, which is glued to the sheathing and sealed with a heat-resistant sealant. If the passage is made of rubber, it can melt from the heating of the pipe, so it is necessary to secure a clamp with a heat-resistant gasket under it.
If you use a roofing duct made of heat-resistant rubber, you can avoid its melting
Video: passing a pipe through a corrugated roof
Ondulin roofing
Ondulin is also called “Euroslate”. The peculiarity of this coating is that it is flammable and does not have great strength. Therefore, to pass the chimney pipe you will need to make a hole in the roof big size and fill it with fire-resistant material that will prevent moisture from entering.
To waterproof the joint between the chimney and the roof, install a metal roof trim with an apron, the edges of which are placed under sheets of ondulin or use an elastic tape “Onduflesh”. This coating requires additional ventilation.
In the roof made of ondulin, you will need to make a hole for a larger diameter pipe and fill it with fire-resistant material
Video: sealing a chimney on a roof made of ondulin
How to route a pipe through a soft roof
Soft roofing is also a flammable material, so a gap of 13–25 mm must be left between the covering and the chimney. Waterproofing the pipe is carried out in the same way as with other coatings, only instead of an elastic tape, a valley carpet is used or the coating itself is applied to the pipe - bitumen shingles or roofing felt.
When waterproofing the joint between pipe and soft roof the covering itself can be used instead of an elastic band
Stages of work to remove the chimney through the roof
To withdraw chimney through finished roof, the following actions are required:
- The location of the passage in the roof between the rafters and the cross beam is selected.
- The box is mounted: rafters are constructed from beams, parallel rafter legs, and beams. The cross-section of the beams for the box is taken equal to the cross-section of the rafter beams. The width of the sides of the box will be 0.5 m greater than the diameter of the pipe.
- A hole is cut in the roof slope. To do this, through holes are drilled in the four corners of the box from the inside, at the junction of the rafters and beams. After this, the layers of the roofing cake are cut along the inner perimeter of the box and diagonally.
After installing the flange, it can be given the required shape with a hammer
Video: DIY chimney box
Exiting a chimney pipe through the roof is a responsible matter, in which strict adherence to installation technology is mandatory so that there is no danger of leaks and pipe destruction. Carrying out pipe removal work includes many nuances that take into account roof covering, pipe material and shape, waterproofing methods. Therefore, you should study all stages of work in advance and consult with a specialist.