For a chimney pipe in already finished roof make a hole. A gap forms between them. The joint between the pipe and the roof must be sealed in any case. To make the connection correctly, it is necessary to use special materials, as well as follow the work technology. Proper sealing of the pipes on the roof will ensure complete protection of the attic from moisture penetration.
If you don't seal the joint
When withdrawing chimney a hole is made in the roof. The gap between the coating and the walls of the chimney is sealed with special aprons, collars and seals. They can be bought at any hardware store. These protective elements are easy to make with your own hands.
If you do not seal the seams on the roof in time, the following consequences are possible:
- Increased wear of roofing material. Water entering the gap hits the inner surface roof, which causes deformation of the coating.
- Reduced service life of the building frame. Water that is poured into the gap between the pipe and the roofing contributes to the gradual rotting of the wood. This is fraught with deformation and destruction of the rafters.
- The insulation loses its effectiveness. Thermal insulating materials, with which the roof is equipped, can quickly lose their properties when wet. If hard insulation is not very exposed to moisture, then soft insulation quickly begins to rot.
- Increased humidity in the attic. Increased dampness causes the appearance of stale, heavy air. This may have a negative impact on interior decoration attics.
The method for eliminating the gap between the pipe and the roof depends on its size and type of coating. The shape of the chimney is also taken into account. For a distance of less than 5 mm, use a heat-resistant sealant. If the gap width exceeds 1 cm, use cement mortar, apron or special seal.
It is necessary to seal the gap between the pipe and the roof for:
- ensuring insulation of the attic space from atmospheric moisture;
- to increase the efficiency of thermal and waterproofing;
- increasing service life rafter system and the entire roof structure;
- eliminating cold bridges.
Sealing the chimney on the roof avoids destruction of the roof itself.
Materials
The seam between the pipe and the roof can be sealed with silicone, acrylic, polyurethane and bitumen sealants. Special sealing tapes are also successfully used. Each of these types has its own advantages and applications.
Silicone sealant became a kind of universal material in construction. It is used both for roofing and for sealing window openings. Silicone sealant is often used when working with glass and wood. It is often used to treat the gap around the chimney pipe on the roof. The material does not lose its properties under prolonged exposure to ultraviolet radiation and high temperatures. To seal the joints of roofing material, there is a special subtype - roofing sealant.
Acrylic sealant More often used for sealing cracks in walls and floors. Acrylic compounds are also used to repair windows. It is rarely used for outdoor work - it is not elastic enough.
Polyurethane, unlike acrylic, is used for exterior work almost everywhere. They glue metal, concrete, wood, stone together. Roofing is ideal for minor repairs.
Bitumen solutions ideally combined with roofing work. They are resistant to precipitation, temperature changes, and chemical solvents. The only drawback such a sealant is its toxicity. For this reason it is not carried out interior work. They are ideal for sealing roof chimneys.
Main advantages of bitumen:
- super durability;
- low cost;
- elasticity;
- possibility of coloring;
- high moisture resistance;
- high level of adhesion to dry and wet surfaces.
There are several subtypes of bitumen mixtures that are designed specifically for roofing. They are able to ensure complete sealing of the treated gap between the pipe and the roofing.
Tape sealant
Tape sealant is a solid material. Many builders consider it the most cost-effective option for roof sealing. Material Features:
- it is based on butyl rubber;
- The sealant tape is highly resistant to ultraviolet radiation and high temperatures;
- it has high adhesiveness, making it easy to install;
- Ideal for sealing joints between chimneys and roofing.
The tape has aluminum coating, which increases the service life of the sealant for outdoor use. The tape is easy to install and operate. The average service life of the product is 10 years. Thanks to the wide color scheme The tape can be used to seal various roofing coverings. The sealant has exceptional adhesion to various surfaces. The tape is used when it is necessary to seal wooden, plastic, metal surfaces. The tape is also successfully used for sealing translucent roofs.
How to use
The surface of the pipe and roof on which the tape is applied must be cleaned and dried. It is important that the area being treated is level. To apply the tape, you need to cut a piece of a certain length, then remove the protective film and press the product tightly against the joint (crack). At temperatures below +5, the tape is first kept indoors at a temperature of 15 degrees for 12 hours.
Using tape in conditions subzero temperature involves heating the surface being treated. The tape is not used for surfaces with an operating temperature above 80 degrees or when the roof slope is more than 55 degrees.
Sealing the gap
The traditional method of sealing the gap between the pipe and the roof involves making an apron. To construct it, you will need abutment strips. They are placed at the bottom of the chimney pipe. They are applied to the pipe and marks are made along the top.
A grinder is used to make a groove. Subsequently, the remaining parts of the apron are overlapped around the pipe. The edges of the strip inserted into the groove must be covered with heat-resistant sealant. The lower parts of the plank are trimmed and fastened with self-tapping screws. The gap between the pipe and the roof is sealed in such a way that water flows into the drainage elements.
The roofing part is mounted on top of the laid elements, and an outer tie is constructed around the pipe. When setting it up, it is important to take into account the pattern of the inner tie. Upper bars are not inserted into the groove, they are simply adjacent to the pipe.
If the pipe is round in shape, you can use a special nozzle. It is also used to seal antennas and ventilation outlets. In appearance it resembles a stepped pyramid. If the nozzle is rubber, it can be used in temperature conditions from -50 to +130 degrees. Silicone models have a wider range - from -70 to +250 degrees.
There should be a distance of 25 cm from the chimney pipe to fire-protected structures. In the case of unprotected elements, it should not be less than 35 cm. Ideal option becomes the creation of an air gap. However, such a solution causes a large loss of heat, which is unfavorable from the point of view of thermal insulation.
Conclusion
The installation of a pipe outlet through the roof should be approached with the utmost responsibility. If the work is done poorly, moisture will regularly enter the attic space. This will entail dampening of the rafter system and insulation.
When removing a chimney pipe, no matter how carefully the roofers try to lay roofing material around it, a small gap inevitably remains in this place. Through it, water will penetrate into the under-roof space, destroying structural elements. Sealing the pipe on the roof is an important stage in the construction of a house, which must be taken with full responsibility.
Consequences of poor sealing of gaps around the pipe
The efficiency of stove heating directly depends on proper sealing of seams. If the chimney is poorly protected, as a result of temperature changes, condensation will form on its walls and flow into the pipe. When the heating is running, it will begin to turn into steam, creating increased pressure in the chimney on the roof. This will lead to a violation of traction and, as a result, a decrease in heating efficiency. Besides:
- moisture seeping through a poorly sealed gap near the pipe will fall on the inner surface of the roofing, which will lead to its rapid destruction and premature repair of the roof;
- the elements of the rafter frame are mainly made of wood - under the influence of water flowing from the roof, they will eventually begin to rot and collapse;
- When moisture gets on it, insulation loses its thermal insulation characteristics and does not retain heat indoors as effectively;
- water leaking near the chimney on the roof becomes a source of dampness in attic room, which will lead to premature wear of the interior trim.
To avoid unpleasant consequences which will be difficult to fix later, you need to know how to properly seal gaps.
Materials for sealing gaps around pipes
To seal cracks, a variety of available materials are used, divided into two categories:
- Elements that serve to close the space between the pipe and the roof. To do this, use various decorative aprons and collars, which can be bought in the store already in finished form or make it yourself. For production, non-corrosive materials are used - galvanized steel, silicone or rubber. Functional purpose such additional elements - rough sealing of gaps.
- A variety of sealants for filling joints left after rough sealing. This category includes waterproof mixtures based on cement and mastic. Today, many modern sealing materials have appeared on the market, which are much easier to work with and the result of the work is of better quality, for example, adhesive-based tape.
The most commonly used sealants for sealing joints around a chimney are:
- Silicone sealant- This is a waterproof, frost-resistant material, easy to use and inexpensive. It can withstand temperatures up to 150˚C, so it is often used to seal seams near pipes in baths and steam rooms.
- Bitumen mastic. Before applying it, the base is thoroughly cleaned of dust and dried. The mastic is applied in a layer of 3-4 mm; if the gap around the chimney is too wide, then it is first filled with polyurethane foam.
- Ecobit is a modern hydro insulating material, providing high-quality sealing. It is a durable aluminum tape with an adhesive base; modified bitumen serves as a sealing layer. The ecobit tape is glued along the perimeter of the chimney pipe. For achievement maximum effect The top is covered with a metal skirt.
- Enkryl is a German acrylic-based mastic for sealing problematic seams. The process of waterproofing a pipe is carried out in several stages. The surface of the chimney is degreased using a solvent and the first layer of sealant is applied with a brush. Then the pipe is wrapped with a viscose-based reinforcing fabric and, after impregnation, the next layer is applied. Manufacturers guarantee that a seam sealed in this way will last 10 years.
The method of sealing the seams between the chimney and the roof depends on their size, the roofing used and the shape of the pipe. If the gap is less than 5 mm, then it will be enough to seal it silicone sealant. To seal wide gaps, more complex ways sealing seams on the roof.
Sealing gaps on tile roofs
This is the easiest way to seal gaps between a pipe and a slate or tile roof that you can do yourself. For sealing you will need moisture resistant mortar cement-based, container for mixing mortar, metal corners, decorative collar and water.
Sequence of work:
- The seam between the outer wall of the chimney and the roofing is lined with metal corners. If the pipe has a round shape, then a self-adhesive rubber seal is used for this purpose.
- A galvanized decorative collar is placed over the top of the pipe and secured with self-tapping screws.
- A waterproof solution is poured through the gap between the chimney and the collar and left for a day to harden.
- After the solution has completely hardened, an inclined surface is prepared from sheet steel for liquid drainage. To do this, cut a hole in the sheet corresponding to the diameter of the decorative collar, put it through the pipe and secure it with self-tapping screws at its base.
To seal the roof with a solution, it is necessary to use a high-quality waterproof mixture, otherwise, with the first serious rain, cracks will form through which moisture will enter the under-roof space.
Sealing seams on slate roofing
The easiest way to seal seams on slate roofing- sealing with mortar. If there is an oval or round pipe using this technology presents certain difficulties. You can solve this problem in the following way.
A ring is made from thick cardboard, wrapped in polyethylene and inserted into the gap between the roof and the chimney pipe. On the slate, a small semblance of formwork is formed from plasticine or any other plastic material. An asbestos-cement mixture is poured into the resulting space. After the cement has set, the cardboard and formwork are removed. An asbestos-cement ring remains around the pipe, serving as waterproofing.
Sealing seams on soft roofs
For sealing brick chimneys on soft roof The coating is cut in the form of an apron, the edges of which are folded onto the chimney and framed around its perimeter with self-adhesive rubber-based tape, for example, Wakaflex or Onduflesh-super. For greater reliability, the tape is crimped with a case. The seams along the edges of the apron are sealed bitumen mastic.
If there are gaps large sizes, they must first be filled with fibrous material. Rope or tow impregnated with bitumen mastic are suitable for this purpose. You can also fill the top with cement mortar.
Gaps around round pipes on soft roofing are sealed with cap aprons, which are sold ready-made. All junctions of such aprons are glued with self-adhesive tape.
Sealing seams on a corrugated roof
The simplest and most effective method for sealing gaps between profiled sheets and a chimney rectangular section- installation of a galvanized steel apron. So that the apron does not stand out against the general background of the roof, it is selected in the same color as the roof. Work sequences:
- L-shaped junction strips are applied to the chimney and lines are drawn on its walls along the upper edge of the strips;
- according to this marking angular grinder with a disk, grooves with a depth of 10-15 mm are made on the stone;
- is installed first bottom bar junction, while the bend in its upper part is inserted into the groove;
- then the side strips are installed in the same way with an overlap on the bottom and lastly the top.
The grooves are filled with heat-resistant silicone sealant, and the lower horizontal parts of the planks are fixed with self-tapping screws to the sheathing. To prevent leakage at fastening points, it is necessary to use special roofing screws with rubberized heads. If you don’t have these, you can cut gaskets out of rubber and put them on a self-tapping screw under the head.
At the final stage, a so-called tie made of waterproof material is installed so that water flows into drainage system Houses. Corrugated sheeting is laid on top of the structure, another decorative false apron is installed and fixed to the pipe with self-tapping screws.
When sealing in this way, you can do without cutting the grooves, but for this you need to lay out a pipe with a protrusion under which the abutment strips will be inserted.
Many furnaces are equipped with round pipes consisting of several layers. To seal the seams around such a pipe, ready-made caps with an apron are produced. They are a galvanized sheet with a hole to which a cone is attached at an angle. The sheet is fixed with self-tapping screws on the sheathing, the pipe is inserted through the hole in the cap. The upper part of the cone is pressed around the pipe with a metal clamp with a gasket, ensuring a tight connection.
In addition to rigid caps, Master Flash elastic penetrations are available for sale, allowing you to seal the seam near the pipe quickly and efficiently. They can be used not only to seal chimneys, but also other roof elements - antennas, ventilation pipes. In appearance, Master Flash is similar to a metal cap, only it is made of rubber or silicone. It can be used at temperatures from - 50°C to 130°C on any type of coating, and is especially suitable for use on translucent roofs.
Installation of flexible penetration is not difficult at all. A hole is cut at its base slightly smaller than the diameter of the chimney. The penetration is simply pulled onto the pipe, the base around the perimeter is coated with heat-resistant silicone sealant and fixed to the corrugated sheet. roofing screws. You can additionally glue the junction of the base and roof with self-adhesive tape. To protect the penetration from ultraviolet radiation, a decorative cap is placed on top of it to match the color of the roofing.
The popularity of fireplaces and stoves in furnishing country houses did not decline after the advent of more modern heating devices powered by natural gas or electricity. Chimney pipes are used to remove combustion products from furnace equipment: their passage through the roof must be as tight as possible.
What happens when there is insufficient sealing?
The section where the chimney exits through the roofing surface is called the passage unit, or simply the penetration. It is installed in the wall or on the roof of a 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 penetrations.
All mistakes made in sealing pipes 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 meet.
- Rotting truss structure . Moisture that gets under the roof through a poorly designed passage unit causes rotting and deformation of the wooden rafter structure.
- Reduced traction. Due to the weak tightness of the contact area 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 internal draft.
In order to eliminate all of the above problems, it is necessary to carefully follow the technology for sealing the chimney penetration. Almost all roofing materials include special additional elements or elastic casings that allow high-quality insulation of the specified area.
Purpose of waterproofing pipes on the roof
Waterproofing a chimney pipe 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 disastrous.
Tasks of sealing a chimney pipe:
- Increased safety of furnace equipment. Chimneys serving solid fuel stoves usually reach very high temperatures. This imposes additional responsibility on isolating its surface from the wooden roof structure.
- Increasing energy efficiency. If you carry out high-quality insulation of the seams, you can significantly reduce heat loss. As a result, noticeable savings in fuel materials will be achieved.
- Pipe protection from condensation. Fine insulated chimney 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 kind of waterproofing should be
Not so long ago, waterproofing the outlet of the chimney was carried out using improvised materials. Currently, a significant number of materials and devices are produced for these purposes to solve the problem of how to seal the gap between the pipe and the roof.
Waterproofing for penetration must have the following qualities:
- Resistant moisture transfer. Since this area is located on the roof surface, this assumes constant exposure to atmospheric precipitation. Therefore, it is very important that the insulating material is able to resist moisture and corrosion for a long time.
- Heat resistance. The surface of the chimney can heat up to +600 degrees, so the waterproofing must cope well 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 last for at least 15-20 years. It is desirable that additional elements have a similar service life.
- Roof compatibility. Before sealing a pipe on the roof, it is important to choose the most optimal option. The selection of material for the design of the chimney outlet is carried out taking into account the type of roofing material. A roof made of corrugated sheets or metal tiles must be equipped with galvanized additional elements. Used on tiled roofs ceramic products, and on soft ones - bitumen.
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 types of sealing agents are there - what is the best way to seal the gap?
Thanks to the ready-made chimney pipe passage units, it is significantly simplified roofing. 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. This apron consists of a set metal corners, which are fixed on roofing slopes and the outer walls of the chimney. This option is usually used on roofs made of corrugated sheets, metal tiles or slate.
- Rubber liners. It's about about rubber or latex seals that have a funnel-shaped design. This form of products is convenient for insulating chimneys with round. They are pulled onto the pipe, fixed to the sheathing through the roofing. To achieve a tight fit of the rubber liner to the surface of the chimney, it is important to correctly select its diameter.
- Membranes. With the help of strip diffuse membranes it is convenient to glue the perimeter of the chimney. In this way, you can design round and rectangular pipes. To be fair, it must be said that this type of sealing is not very aesthetically pleasing.
To achieve reliable waterproofing for penetration, it is recommended to use multi-layer structures, where a combination of rubber compressor, internal apron and external decorative edging.
Any facility that is equipped with a chimney must have good sealing to prevent leaks. If you use unsuitable materials or sealing methods, this will cause condensation to form on the pipe walls. In turn, poor waterproofing of the chimney on the roof will lead to an increase in pressure, loss of draft and the occurrence of cracks in the pipe.
Waterproofing the chimney on the roof will eliminate many difficulties during the heating period Source slab-tok.ru
Where does waterproofing begin?
Heating devices will operate in a safe mode only if the waterproofing is carried out correctly and taking into account all existing rules and recommendations. Waterproofing is carried out taking into account:
Between the rafter system and the roof there must be certain distance, which depends on the materials used. Flammable – 150-300 mm, non-flammable – 100-250 mm.
Sequence of layers in the roofing pie must not be disturbed. It is necessary to block the possibility of moisture penetrating inside the prepared cake, since any liquid will cause rapid destruction of the layers. The insulation must be separated from the pipe by a gap. Otherwise, there is a risk of fire, since most insulation materials are flammable.
Box- This is the required device for separating the roof from the pipe. The distance should be approximately 150 mm. Inside the created box is filled with any thermal insulation material, which has non-flammable properties.
Films that perform insulation tasks must be cut “envelope”, and then pulled to the cross beam so that it can be attached with nails. Waterproofing must be fixed with lathing, vapor barrier - with a special frame. All joints of the box and insulation layers must be edged with special tapes.
Sealing a chimney is a complex process and requires certain skills and knowledge Source stroy-krov.ru
How is it carried out?
If the owner of the property notices that a leak appears near the pipe, then in most cases the cause is poor-quality roof sealing. To avoid leaks, specialists install aprons. Installation must be carried out in accordance with the algorithm:
Needs to be laid drainage channel. It is required to remove moisture from the pipe.
To provide maximum joint tightness roof covering and chimney, an internal apron is used for the pipe on the roof.
Need to cut waterproofing underlay, which should be placed under the bottom edge of the apron. If the roof is covered sheet material, then the edge of the substrate must be brought out between the sheets from below. It is imperative to create a side to direct the water along the slope.
The roof covering must be laid around the pipe.
Using an identical algorithm external apron installed. The only difference is in securing the top edge to the chimney.
Insulating apron can be created manually or a ready-made version can be purchased. The chimney must pass inside the apron.
Attaching the apron to the pipe Source banya-ili-sauna.ru
roof repair
Materials used
The materials used for sealing are divided into three types, each of which has its own advantages and disadvantages.
cotton wool
It is a roll or shortened fibers. Positive traits cotton wool:
soundproofing;
fire resistance;
adheres tightly to surfaces;
reduced heat capacity;
reduced thermal conductivity;
resistance to physical impact (shock, vibration);
resistance to chemical exposure;
heat resistance;
elasticity;
electrical insulation.
Cotton wool is the most common material for insulation Source 1000dosok.info
Roll filters
They are a mullite-siliceous composition that is included in the fibers of the composition. Positive qualities of roll filters:
flexibility;
it is permissible to use inorganic glue;
easy to cut;
the mechanical fastening can be firmly fixed.
On our website you can find contacts construction companies who offer the service of designing country houses. You can communicate directly with representatives by visiting the “Low-Rise Country” exhibition of houses.
Asbestos and kaolin boards
In production, mullite-siliceous fiber is used. The disadvantage of the slabs is their immunity to alkalis and acids when high temperatures. To eliminate the deficiency, additional insulation will need to be installed. Positive qualities of slabs:
soundproofing;
low density, but higher than that of cotton wool;
low thermal conductivity;
resistance to physical impacts, such as vibrations;
resistance to steam, water and oils;
resistance to melting non-ferrous metals;
elasticity;
electrical insulating properties will be maintained at temperatures up to 800 degrees Celsius.
Possible ways to eliminate gaps
There are three ways to eliminate gaps between the pipe and the roof:
Special apron, which performs protective properties. It can be purchased at a specialty store or built.
Passage from of stainless steel . It is thrown over the pipe itself, after which the joint that appears must be closed with a clamp.
The joint is covered with a rubber clamp Source uteplovdome.ru
Silicone sealant. Best suited in cases where the gap is small.
Depending on the materials, sealing methods also change. For example, sealing a pipe on a metal roof is only possible with the installation of an apron. In some cases, depending on the roofing material, individual sealing methods may be used.
Sealing a square pipe on a slate roof
A slate roof adds its own nuances when it comes to creating a sealed pipe. Because of the slate, it is impossible to use any other parts for insulation, so the protection effect was achieved through a cement-sand apron, which was created as follows:
All cracks must be covered with collar collars made of galvanized steel. This material does not corrode and can last a long time.
Poured cement-sand mortar so that it is above the roof level. If a cardboard cylinder was used in the process, then the procedure will be easier and simpler.
Water drainage should be carried out using an inclined ledge, which must be located on the side of the ridge.
When sealing a chimney, do not forget about water outlets Source dom.dacha-dom.ru
If, when pouring, for convenience, a cardboard cylinder with plastic film or a plastic side, these parts must be removed after the mass has hardened. Despite his appearance, this method of sealing is in no way inferior to alternative ones, which cannot be used on a slate roof.
Sealing round multi-layer chimneys
It is much easier to install sealing on modern chimneys round shape. The simplicity of the process is due to the fact that no additional equipment is required, since the pipe is already equipped with everything necessary. Installation takes place in three stages:
Prime the edge of the pipe where the waterproofing will be attached.
Do hole in waterproofing, and then glue it to the pipe using mastic.
The sheet should be attached to the sheathing. The pipe is passed through a cap, between which a clamp with a heat-resistant gasket must be located.
Round metal chimneys Source pinterest.com
If there are no caps, then flexible elastic seals for pipes are used instead. The sealant can also be used anywhere else where roof insulation needs to be improved.
Sealing a pipe on a bitumen roof
In this case, the chimney must be sealed using Wakaflex tape. At the same time, it is observed next procedure:
Creation tape cuttings.
Cutting pressed with the help of the case.
Appeared gaps must be sealed using bitumen mastic.
Bitumen mastic best protects against bad weather Source www.drive2.ru
Video description
The process of chimney waterproofing in the video:
Sealing on the roof made of metal tiles and corrugated sheets
Sealing on a roof with such a roof is only possible when using an abutment strip. When sealing a chimney on a corrugated roof, it is necessary to observe next procedure:
Decide with the installation site of the chimney.
Partially delete waterproofing membrane in this area.
Create a metal apron, which must be assembled from the outer and lower abutment plans.
Lay down roofing material on top.
The resulting joints need to be treat with sealant.
Waterproofing a chimney on a roof covered with metal tiles Source vl-fasad.ru
Conclusion
When waterproofing a chimney on a corrugated roof, it is necessary to choose the right material. Otherwise, the seal will be broken, which will lead to various problems, including further destruction of the chimney pipe.
How can you eliminate gaps?
Seal gaps between chimney and slate roof
Getting rid of cracks on a tiled roof
Material for waterproofing bitumen roofs
The process of eliminating cracks in a corrugated roof
Installation of a chimney is generally not complex process However, in some places, such as floor crossings, some difficulties may arise.
How and with what to seal the gap between the pipe and the roof?
An important point is to ensure proper waterproofing. We will talk about this and other nuances related to how to seal a chimney pipe in this article.
Even if the pipe is placed as tightly as possible on the roof, minor gaps will still remain. When it rains, moisture will constantly enter the attic through them, which over time will lead to damage to the roofing structures. This is why roof pipe sealing is so important.
How can you eliminate gaps?
The easiest way to solve the problem of how to seal the gap between the pipe and the roof is to install an apron on top. You can do it yourself, in which case you will need to provide strips for connection to the pipe in advance. There is an easier way - to buy a ready-made stainless steel roof passage. Often, round passages are made for the chimney, and they are made of stainless steel. The passage is placed on the pipe, and the joint is fixed with a steel clamp.
If you need to seal minor gaps formed between the pipe and the roof, then for these purposes you can use silicone sealant (read: “Which sealants for chimneys are best to use - types, characteristics”). You can find a huge variety of them on sale, but we need a heat-resistant type.
The process of how to seal a roof around a round pipe will differ slightly depending on the type of roofing, that is, in addition to the basic recommendations, there are also algorithms that will vary somewhat.
Seal gaps between chimney and slate roof
Sometimes the question arises of how to seal the gap between the pipe and the slate.
The technology provides the following sequence:
- First, cut a round hole in the steel sheet which will be required to finish the ridge.
- Next, a ring of sheet asbestos cement is placed on the pipe.
- For absolute sealing, so that in the future there will be no problems with the leaking pipe on the roof, the joint between the pipe and the roof is sealed with an asbestos cement solution (proportion 1:2).
- In addition, the same solution is used to fill the gap between the chimney pipe and the slate sheet. To do this, you can temporarily make a limiter out of cardboard.
Getting rid of cracks on a tiled roof
On a tile roof, it is best to seal the cracks with a solution of sand and cement, which the best way will protect inner part buildings from moisture and precipitation.
To achieve the best moisture insulation, you will need:
- Install a galvanized collar on the roof, thus creating a place for pouring the solution.
- Pour a solution of cement and sand, making sure that it clearly fills the entire space between the roof and the chimney.
- In addition, you will need to make a surface and place it at an angle so that excess liquid flows down it.
Material for waterproofing bitumen roofs
Among the options for covering a pipe on the roof if it rises above a bitumen roof, the most optimal is the use of Wakaflex self-adhesive tape.
You can perform isolation in this way:
- First, cutting is done from the Wakaflex tape.
- At the next stage, this cutting needs to be pressed with a pipe case.
- At the end, all remaining gaps between the parts being connected are sealed with bitumen mastic.
The process of eliminating cracks in a corrugated roof
As a rule, when installing a chimney through a corrugated roof, a ready-made Master Flash pipe cutting is used. Its advantage is also that it is very convenient to use such a kit; it can be used for roofing made of almost any material. Read also: “Methods of installing a chimney on the roof of a house - advantages and disadvantages of different options.”
In essence, Master Flash is an apron cap made of silicone or rubber, placed on an aluminum base.
As for operating temperatures, for the silicone version of products it is significantly wider - in the range from -50 to 130 ℃.
The process of sealing cracks on a profile roof includes the following manipulations:
- A gap is cut in the cap, the diameter of which is slightly smaller than the cross-section of the chimney.
- The Master Flush is put on the chimney.
- A gasket is placed at the base of the chimney.
- The joints between the material are sealed with silicone sealant.
- The base of the chimney is fixed to the profile roof using screws.
Often the described manipulations do not provide sufficient tightness on the profile roof, so that during rainfall water leaks into the cracks. In such cases, the best option is to use self-adhesive tape reinforced with aluminum. It is very convenient to use such material, since it does not require pre-heating before use.
Thus, the fact how well a corrugated roof will be sealed at the exit point of the chimney depends largely on the choice of material and the quality of the work performed. However, we are confident that by following our instructions exactly and working responsibly, you will be able to protect your home from any surprises associated with roof leaks.
Home Construction Roof is leaking, roof repair, tricks and repair tips
The roof is leaking, we are horrified, rushing for a basin.
We substitute him under the drops and watch with sadness what happened. The holiday was ruined; bad weather insidiously made its way into our house.
Pipe leaking on the roof
But maybe it's time to look at the problem from the other side? After all, rain, in a sense, is an indicator signaling problems with the roof, which is the time to patch it up before the winter cold hits. This is what helps diagnose leaks.
Often, before appearing on the surface, water travels a long and winding path, sometimes overcoming complex design roofs.
For those who have a “simpler” roof - slate or metal with a traditional gable profile, detect a crack or hole easier than the owners of multidisciplinary tiled roofs, but in any case you will need attention and patience.
The most vulnerable places abutment of the roof to chimneys, bases of television antennas, as well as joints with projections of walls and windows.
The reason may also be a suddenly cracked shingle or hole in slate caused by a fastening nail that has rusted or lifted.
When examine the roof from the attic, pay attention any stains on the rafters and sheathing are evidence that eloquently indicate the location of the leak.
Remember visually or mark those places on the roof where, when the weather improves and repairs can begin, you can put your foot on without risking falling through.
After all, your own safety is no less important than the integrity of the roof.
For those who suffer from height anxiety or are prone to dizziness, it is better to entrust the work to professionals.
Throw it over the roof ridge, secure it to reliable beams and tie it with a sailor's knot.
If the damage is minor(crack, slight displacement or hole), sealing them is not difficult. Whatever your roof is - slate, metal, roofing felt or tile.
Use for this purpose, waterproof glue, resin, which are sold in specialized stores, or drying oil putty, purchased or prepared independently.
Due to the high consumption of material, larger damages are usually repaired bitumen(price 41.50 rub./kg) or cement mastic (33 rub./kg).
After drying, the last two materials are primed and reinforced with paint on top.
For waterproofing and sealing roof joints bitumen mastic is the most popular product.
Alternative options are ready-made roof coverings containing bitumen, or more expensive, but also more reliable strips of stainless metals - stainless steel, aluminum, etc.
There are also self-adhesive strips with aluminum foil on sale, back side which has adhesive (gluing) properties (roller 12.5 m long, 8 cm wide - RUB 2,557.50).
You can temporarily seal the joints with simple putty.
At the beginning thoroughly clean the damaged area of dirt, rust or lichen (it can be destroyed by pouring boiling water over it). Only when the area that needs sealing is dry, apply the selected material.
More extensive damage can be repaired using patches made from various self-adhesive materials sold in stores, and homemade ones made from metal, roofing felt, tarpaulin or any dense waterproof fabric.
When repairing metal surfaces, patches of the same metal are applied and mastics containing bitumen are used.
To prevent corrosion, new insulation or nails used to attach patches must be of the same metal as the old ones.
Seal the edges carefully: for durability and aesthetics, cover the top of the patch with a waterproof coating. They are the most different colors- white, terracotta, green, gray, etc.
A “home-grown” patch made of waterproof fabric is placed on drying oil putty or paint, and after drying the latter is painted.
In any case, the patches should cover the area of the repaired area on all sides by 6-10 cm.
When you replace failed tiles, or slate sheets, or rusted metal strips, try to adhere to two important principles.
First— the replacement material must be an exact copy of the previous one in size and quality.
Second- adjacent coating elements should be affected as little as possible.
When there are deep holes in “layered” roofing felt roofs, the damaged layers are usually cut crosswise and the corners are turned away, after which they are cleaned, dried, primed, puttied (bitumen mastic with the addition of sand, sawdust, etc.) and sealed back.
The work is completed with one or more patches of roofing felt, each of which should be approximately 10 cm larger than the previous one. They are resinous and sprinkled with sand or gravel or marble chips for strength.
Saving on materials, you run the risk of discovering that a “cheap” roofing felt roof doesn’t cost you that little. After all, a continuous sheathing is needed under it, and every year it needs to be treated with mastic.
And having spent money on tiles, you long years save yourself the hassle. And over time, she can become “dear” to you, not only in a financial sense.
During emergency work, not only dexterity is required, but also a good memory. After all what you do temporarily, then it is advisable to redo it “forever”
Do not neglect technical innovations - stainless steel roofing nails, nail remover. The first will save you from problems in the future, the second will make your work much easier.
