How to seal seams in a metal roof. How to seal corrugated board joints

Profiled sheet with various (acrylic, polyester, etc.) polymer coatings has proven itself well as a roofing material. The steel base and stiffening ribs guarantee long-term operation of corrugated roofs.

But, unfortunately, the bright prospects for trouble-free roof operation can be destroyed by harsh reality. The reasons for such unnecessary and untimely roof repairs from corrugated sheets can be:

Poorly manufactured material ~ in 5% of cases. This is an extremely rare moment and most often concerns corrugated sheets manufactured in violation of technology and using homemade equipment.
Incorrect roof design ~ 4%. Most often, this is an insufficient slope angle or an incorrectly designed interface between hip and gable roofs.
Disadvantages of the rafter system ~ 12%. Unmaintained plane, subsidence of the sheathing during the operation of the building, insufficient treatment of the rafter system with antiseptics.
Not correct installation roofing ~ 79%. Moisture may leak in due to improper fastening sheet elements, but the main reason for roof leaks from corrugated sheets is the joints.

The joining of metal roofing elements made of profiled sheets can be divided into three groups:

Transverse joints - places of overlap sheet panels on top of each other with the waves coinciding across the entire width of the sheets.
Longitudinal joints - connecting sheets along stiffeners (waves).
Joints with additional elements - places where corrugated sheets join with ridge, valley, pediment, cornice and abutment strips.

Transverse joints are the only group of joints, the number of which can be reduced to increase the reliability of the roof. It is important to note that the factory equipment can produce corrugated sheets with a length of 50 to 1200 centimeters. And if the supplier claims that the material is produced in a strictly specific size, then most likely it is an intermediary and not a manufacturer.

The use of profiled sheets of the required length (the length of the slope + the amount of overhang) allows you to completely avoid transverse joints. Sometimes such a process is impossible due to the difficulties of lifting and installation, and the metal roof elements being too large in size.

If the roof is installed with transverse joints, you should adhere to a certain algorithm that relates the angle of the roof and the amount of overlap:

The reasons for moisture getting under the roof plane can be three factors:

Insufficient amount of transverse overlap. Leaks can be eliminated using a special sealant. But still, it is better not to skimp on the length of the corrugated sheets.
Incorrect vertical placement of sheets. You can check this by pulling the cord along one of the wave crests. If the deviation is greater than 3 mm per meter, problems may arise with water entering through the interface. This danger is especially likely at small angles of roof inclination. It will have to be eliminated using sealant.
Incorrect fastening of the joint. Sheets of corrugated sheets at the junction should be fastened into each cavity between the ridges of the stiffeners. For fastening, special self-tapping screws with a hexagonal head are used to match the color of the roof. Hardware with a diameter of 5.5 or 6.3 mm is equipped with a drill (drill) and a washer with a rubber gasket. Fastening is carried out through two joined sheets with screwing a self-tapping screw into the sheathing to a depth of at least 35 mm.

Longitudinal joints of corrugated roofing

Compliance with fairly simple installation rules will allow you to avoid troubles such as rain splashes or blizzard snowflakes penetrating under the roof through longitudinal joints.

Firstly, the first row of sheets must be aligned with the bottom edge using a cord stretched between the extreme points of the roof.
Secondly, the outer waves of the profiled sheets must coincide, forming a gap of no more than 1 - 2 mm.
Third. The joint of the sheet elements is secured roofing screws. The attachment point is the ridge of the stiffening rib of the top sheet. The fastening pitch is no more than 400 mm. And with increased gaps from 150 mm.

If, however, the joint gaps are separated, then you should use a sealant to seal them or fasten the side edges with a 4.2 x 25 mm press washer with a drill and a washer with a rubber gasket.

Pairing corrugated sheets with additional elements

The joint of corrugated sheeting with a ridge strip is the most complex element of external roofing works. It is important that the skates are attached not only to the metal of the profiled sheets, but also to wooden base rafter system. Fastening is carried out with roofing screws into the crest of the stiffener, through the side of the ridge. Fastening is carried out in each wave.

The distance between the top edges of the joined sheets should not exceed 50 mm.

Even with a perfect fit of the ridge, there will be gaps between the ridge and the corrugated sheet between the crests of the waves. Rain is unlikely to penetrate such gaps, but snow can easily get into the under-roof space. Even with a small height of the stiffeners, filling the voids with sealant alone is not economically feasible. The basis for applying silicone can be pieces of extruded polystyrene foam or polyurethane foam that fill the cavities between the ridge and the sheet. But liquid polyurethane (spray foam) must be used extremely carefully to avoid compromising the integrity of the roof.

The valley strips are connected to the corrugated sheeting in the following sequence:

Fastening the bottom strip to the sheathing using a 4.2 x 25 mm press washer with a drill and a washer with a rubber gasket. You can see how this is done in the video:
Installation of corrugated sheets.
Installation of the upper (decorative) valley is carried out using roofing screws.
Sealing the joints of sheets and the upper valley with polyurethane foam and sealant.

Wall extensions protect the roof from moisture penetration between the wall and the profiled sheets.

Metal parts are connected with roofing screws. Such planks are attached to the wall with dowels (brick) or a press washer with a rubber gasket. The joints between the wall and the wall strip are sealed with tape sealants. The interfaces between sheets and extensions are treated with rubber or silicone sealants.

Installation of front and wind strips is carried out directly on sheets of corrugated sheets using roofing screws and does not require sealing.

Corrugated sheets, how roofing material, today at the very top of its popularity. And all due to a completely new approach to its production. This is no longer just a gray galvanized sheet with a ribbed surface. This is a huge variety of paints with high anti-corrosion qualities. Manufacturers offer an improved model coated with a polymer protective composition. Plus the low price, that's why it's very popular.

In addition, covering a roof with corrugated sheets yourself is not difficult, but you need to take into account some subtle aspects of the installation process. One of them is sealing joints. This is how we can be guaranteed to talk about high-quality work on covering the roof with corrugated sheeting. What do experts suggest, what materials can be used to seal the joints of the structure?

Let's start by identifying those places (joints and cracks) that need to be sealed.

These are the places where the roof meets the wall.
Places where corrugated sheeting joins chimneys and ventilation ducts.
Joint between laid profiled sheets on a roof with an inclination angle of less than 12°.
Valleys, ridge and cornices.

Materials for sealing joints of corrugated sheets

Mainly, sealants and sealants are used to protect joints in corrugated roof structures. special tapes. Let's look at each of the materials and determine their quality characteristics.

Sealants

The modern building materials market does not offer very large the lineup sealants. The thing is that they are based on polymer components that are used today in various areas of construction and industry, and they have begun to appear very often in everyday life. There are not many such polymers, hence the meager assortment.

Silicone

So, I wanted to name silicone sealant first in the model line. According to its purpose, it is a universal sealing material that is used almost everywhere. Silicone itself is an organic compound based on silicon, hence its high adhesive properties; it can be bonded to almost any materials used in construction. Therefore, we can say that this option is the optimal solution if the task is to seal the joints of corrugated sheets on the roof.

The silicone sealant itself is very dense, but at the same time very elastic. Its main quality is to withstand a fairly large temperature difference. For corrugated sheets it is perfect option, because a metal roof gets very hot during the day and cools down quickly at night. Let's add to the positive characteristics the elasticity of the applied layer after application, which does not lead to cracking, plus silicone is resistant to impact sun rays. For a roof, this is one of the important requirements.

The disadvantages include:

Do not apply to wet joints.
Does not stain.

Thiokol

This sealant is also called polysulfide sealant because it is based on bitumen. For corrugated roofs, this is not the most ideal option for sealing joints. Its ability to harden under any conditions is surprising. Even a temperature difference from -40C to +40C will not make it soft. Manufacturers claim that the service life of thiokol sealant is 15 years.

The strength of the sealant is its disadvantage when it comes to sealing the joints of corrugated sheets on the roof. The thing is that a metal profiled sheet, under the influence of temperatures, either expands or contracts. So the joints are subject to heavy loads during the day. Therefore, we can say that thiokol sealant is not the best option in this case.

Polyurethane

Probably, speaking about polyurethane sealant, we need to recall mounting foams. After all, this is one of its varieties, or rather, it is a foamed polyurethane sealant. This material has excellent thermal and waterproofing characteristics and increased adhesion to any materials, even to itself.

The only drawback is that when exposed to sunlight, it turns yellow and loses its positive traits. Therefore, it is recommended to use it in those places on the roof where the joints and crevices of the corrugated sheeting are in the shade, away from sunlight, especially direct sunlight.

Today, however, more and more manufacturers are focusing on new models of polyurethane sealants that are not afraid of either the sun or changes in temperature and humidity. And if the classic compositions are one-component solutions, then the new ones are two-component ones. By the way, the development of these types was carried out by the TechnoNIKOL company, it Russian market and introduces them.

There is another type of PPU sealants - this liquid mixtures. They are usually applied to the joints of corrugated sheets with a brush or roller; there are even cases when the application was made with a spray gun, after which a durable polymer layer that is one hundred percent waterproof was formed between the sheets. The guaranteed service life of the mixture is 20 years.

Many experts today give their preference to liquid polyurethane material. But today it is the most expensive sealant, although with the lowest material consumption.

Acrylic

This option is the most environmentally friendly and can withstand almost all natural loads. It is based on acrylic resins and water, so it is not afraid of high humidity and precipitation. It is also not afraid of sunlight and can withstand frosts down to -15C. Plus, acrylic sealant is easy to paint, so the joints of the corrugated sheeting will be almost invisible.

Purely acrylic composition It is not used to seal corrugated sheet seams, because after three to four years it fails and simply begins to crumble, so it is recommended to use its siliconized version. This is a symbiosis of silicone and acrylic. True, there is one point in its use - it can only be used from the attic.

Self-adhesive tapes

Today, sealants are increasingly being replaced by tapes and cords made from butyl rubber. They are self-adhesive, so there are no problems with installation and fastening.

Their positive qualities:

High moisture resistance;
Chemical resistance;
Good elasticity;
Withstands differences from -60C to +90C.

Conclusion

And in conclusion, we invite you to watch the video:

Internal drains: standards, SNiP
Plastic roof drain
Drain from sewer pipes with your own hands
Rules for installing gutters

One of the most important events During any construction, reliable sealing of the roof is essential. Much depends, of course, on the quality of the roofing and the method of its installation.

But this alone is not enough - all even slightly vulnerable areas must be carefully isolated from moisture.

There are special hermetic roofing compounds for this purpose. Smart choice the right remedy will ensure proper treatment of any type of roof.

After its use, the roof will not allow moisture to pass through, will be more durable and repairable.

Types of roofing sealants

There are different types of sealants. They are used in the process of repair and planning work, as well as during construction.

These can be completely different construction and finishing activities:

sealing seams between individual elements, for example roofing sheets, especially for roofs that have a slight slope;
elimination of cracks near ventilation shafts, chimneys and drains, antennas and other objects that violate the integrity of the coating;
elimination of cold bridges;
insulation of joints between the roofing itself and other materials;
sealing inclined skates;
quick removal of leaks.

All existing sealants are conventionally divided into six main types. Let's look at each of them in more detail.

1. Tape

What are the main advantages of tape sealant? After all, this product is one of the most effective and inexpensive for roof protection.

Its advantages are as follows:

very resistant to sunlight and negative temperatures;
possibility of quick and convenient replacement;
excellent mechanical strength;
ease of application;
sealed and durable layer of bitumen;
long-term operation.

This tape material is convenient to use for emergency repairs. bitumen roofing(in the form of neat patches), for sealing vapor barrier films, for repairing drainage systems and metal roofs, for sealing joints.

This tape is very simple and easy to use. Therefore, people who have no construction experience can use it without any problems. Like regular tape, this tape is fixed to the joints and seams.

2. Bitumen, rubber

Advantages of this material a lot:

excellent moisture resistance;
good elasticity;
affordable price;
Possibility of painting to match the general color of the roof;
durability and excellent strength;
excellent grip on dry and wet surfaces.

This type of sealant is most often used for working with metal roofing (metal tiles, corrugated sheets, etc.), roofing felt and tiles.

Their disadvantages are poor resistance to high temperatures and fairly high toxicity.

3. Silicone

Silicone mixtures are packaged in standard pistols or buckets. From large containers they can be applied with a construction roller or a special advanced spray gun.

This variety is one of the most affordable and widespread on the market.

All silicone products can be divided into neutral and acetate (acetic). The former are less toxic and odorless, but are inferior in strength to the latter.

Advantages of the composition:

multifunctionality;
rapid hardening;
good resistance to sunlight and temperature fluctuations;
can be used for both long-term and temporary isolation.

4. Acrylic

Acrylic mixtures resemble high-quality silicone ones, but their prices are more affordable. The surface for their application must be perfectly dry.

Pros of acrylic:

no irritating odor;
excellent grip with coating;
absence of solvents in the composition;
Available in a wide range of colors.

Classic acrylic sealants do not have the best waterproofing properties, since they are based on a water-soluble dispersion.

If you decide to use this particular product, it is recommended to strengthen the protection with tape to seal joints and seams.

5. Polyurethane

To make polyurethane sealant, a resin is used, which special conditions undergoes a polymerization process.

The resulting mixture, viscous and light, is easy to apply to any type of surface.

But all these disadvantages are compensated by its remarkable performance qualities.

This type of sealant has the following characteristics:

durability;
ease of application;
excellent resistance to corrosion, mechanical stress and high humidity;
high efficiency;
fast hardening;
maintaining working qualities even at sub-zero temperatures.

It goes well with any type of roofing material, providing reliable and durable insulation that can be considered ideal.

6. Two-component

The basis of a two-component mixture is usually silicone rubber. It is represented by a special hardener and adhesive paste.

Separately, the composition can be stored for a very long time (in accordance with the specified period). But after mixing, a chemical reaction begins, so the mixture must be used within a certain specified time.

What can such compositions boast of?

The seam after application is smooth and even.
The widest temperature range for preserving the properties of the product is from – 70 to + 70 degrees.
Very easy to apply.
They have excellent adhesion to the main building materials– brick, wood, metal, PVC, concrete, etc.
Can be applied both in winter and summer: the temperature for application is from -25 to +40 degrees.

Mastic for roofing

In addition to all of the above compounds, so-called mastics can also be used to seal the roofing.

These are various viscous plastic pastes, for the production of which binders are combined with various fine fillers (soot, graphite, talc, etc.) and special additives.

Depending on the components included in the composition (rubber, resins, plasticizers), a mastic of one quality or another is obtained that has the required characteristics. For waterproofing, bitumen mastic is mainly used, and its more expensive analogue is polymer.

The latter has higher adhesive properties and, in addition, it is more elastic. It is more preferable for installation soft roof (roll materials). Before applying any mastic, the working surface must be well cleaned of dirt and dust.

Selecting a sealant

How do you know which specific sealant is suitable for each individual case?

Different types of sealants differ markedly in their performance qualities. Some types may be ideal for a certain type of coating, but practically unsuitable for a completely different one.

Let's consider the most popular of them, suitable for different types roofs.

Sealants for metal roofing

Roof coverings of this type require products with the following qualities:

reliable adhesion to metal;
high elasticity;
good vibration resistance;
resistance to precipitation.

These characteristics are most consistent bitumen rubber sealants and polyurethane, which are able to maintain high ductility throughout the entire operational period. Before starting work on metal coating, the areas where the substance is applied must be well degreased and dried. In the case where the roof needs urgent insulation, the best solution is a composition that can be applied to a damp surface.

It is important to know that the use of silicone insulation on iron roof may directly cause rust.

In terms of its qualities, corrugated sheeting is very similar to metal tiles. Therefore, they are sealed in a similar way. Most acceptable roof slope should be 14 degrees. The transverse joints of profile sheets need to be given special attention. For such a roof, sealants based on silicone and polyurethane are most suitable for their performance characteristics.

Sealing corrugated roofing

To carry out proper sealing of a roof made of corrugated sheets, it is important to do the following.

Before starting the procedure, check the joints - you can only work with dry and clean surfaces.
Apply sealant to the corrugated sheeting covering in a uniform layer about 3 mm thick. You can use polyurethane tape.
All activities are carried out at positive temperatures and in relative dry air.

Sealing metal roofing

When selecting a sealant for a metal roof, despite all its similarities with corrugated sheets, it is important to consider the following:

the best final result is obtained when using silicone, which has increased resistance to ultraviolet radiation;
silicone sealant is suitable for cracks no larger than 5 mm;
do not forget to treat the ventilation outlets, the edges of the pipe apron, the antenna outlet, and the longitudinal and transverse joints of the roofing carpet with the mixture.

Sealant for soft roofs

Flexible roofing, or, in other words, soft tiles, has always been considered a very popular and popular coating. For its large-scale sealing, one type of mastic is usually used.

In other cases, many additional factors are taken into account, for example:

special sealing roofing tapes are excellent for eliminating joints and seams;
if the roof is almost or completely flat, then bitumen mastic or emulsion is suitable for it;
for local repairs of individual defects and leaks, it is good to use liquid one-component rubber or an elastic waterproof compound;
the mastic is well applied to any surface, even wet, has excellent adhesion with many of the most different materials, does not form swellings.

When choosing the roofing sealant you need, read all labels on the package.

It indicates the possibility of hardening in a humid environment, setting speed, compatibility with other materials, the possibility of subsequent painting, and resistance to precipitation.

All of this is important to you, so pay attention to it. A competent choice will help you choose the right composition for insulation, and strict adherence to technology guarantees the reliability of the protection carried out. To do most of the work yourself, theoretical knowledge and a little practical experience are usually sufficient.

If you are still in doubt, contact a specialist. They will not only be able to give advice on which product is suitable in a particular case, but if necessary, they themselves will carry out reliable and high-quality waterproofing.

Gennadievich:
And the price of the issue is completely different: 180 rubles per liter.

Click to expand...

What is the price for square meter material + work? Why do we need to know about the liter?

Gennadievich:
I give a 10-year guarantee for such a spray-coated roof. The service life of the material until complete destruction is 50 years. 20-year UV protection guarantee.

Click to expand...

10 years for what? that there will be no leaks? And if they do, how do you respond? Will you spray the top again or will you replace the entire roof?

What does 50 years from complete destruction even mean? In 50 years, will at least a square meter be covered with your composition or what?

20 years of UV protection? After 20 years, will the coating begin to transmit ultraviolet radiation and the corrugated sheet underneath will become tanned? (about the tan, of course, a joke, but the truth is not clear)

When removing a chimney pipe, no matter how carefully the roofers try to lay the 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 pipes on the roof important stage when building a house, which must be taken with full responsibility.

Consequences of poor sealing of gaps around the pipe

Efficiency 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 in the chimney on the roof high blood pressure. 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 inner surface roof covering, which will lead to its rapid destruction and premature roof repair;
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 that will be difficult to correct 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, they use various decorative aprons and collars, which you can buy ready-made in the store or make yourself. For production, non-corrosive materials are used - galvanized steel, silicone or rubber. The functional purpose of such additional elements is 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 waterproofing material that provides 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 around the perimeter of the chimney pipe. To achieve 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 with silicone sealant. To seal wide gaps, more complex methods of sealing seams on the roof are used.

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. To seal, you will need a moisture-resistant cement-based building mixture, a container for mixing the mortar, metal corners, a decorative collar and water.

Sequence of work:

The seam between the outer wall of the chimney and the roofing is covered 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 a slate roof is to seal it with mortar. If you have 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

To seal brick chimneys on a soft roof, the covering 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 aprons-caps, 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 effective method for sealing gaps between profiled sheets and the 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;
The lower abutment strip is installed first, 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 ovens are equipped 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, elastic Master Flash 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. Appearance Master Flash is similar to a metal cap, but 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 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 with 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.

Corrugated sheeting, as a roofing material, is at the very top of its popularity today. And all due to a completely new approach to its production. This is no longer just a gray galvanized sheet with a ribbed surface. This is a huge variety of paints with high anti-corrosion qualities. Manufacturers offer an improved model coated with a polymer protective composition. Plus the low price, that's why it's very popular.

Let's start by identifying those places (joints and cracks) that need to be sealed.

These are the places where the roof meets the wall.
Places where corrugated sheeting joins chimneys and ventilation ducts.
Joint between laid profiled sheets on a roof with an inclination angle of less than 12°.
Valleys, ridge and cornices.

Attention! According to the last position, it is recommended to apply a sealable layer to the upper wave of the lower sheet.

Materials for sealing joints of corrugated sheets

Basically, sealants and special tapes are used to protect joints in corrugated roof structures. Let's look at each of the materials and determine their quality characteristics.

Sealants

The modern building materials market does not offer a very large range of sealants. The thing is that they are based on polymer components that are used today in various areas of construction and industry, and they have begun to appear very often in everyday life. There are not many such polymers, hence the meager assortment.

Silicone

The silicone sealant itself is very dense, but at the same time very elastic. Its main quality is to withstand a fairly large temperature difference. This is an ideal option for corrugated sheeting, because a metal roof gets very hot during the day and cools down quickly at night. Let's add to the positive characteristics the elasticity of the applied layer after application, which does not lead to cracking, plus silicone is resistant to sunlight. For a roof, this is one of the important requirements.

The disadvantages include:

Do not apply to wet joints.
Does not stain.

Thiokol

Polyurethane

Probably, speaking about polyurethane sealant, we need to remind you about polyurethane foams. After all, this is one of its varieties, or rather, it is a foamed polyurethane sealant. This material has excellent thermal and waterproofing characteristics and increased adhesion to any materials, even to itself.

The only drawback is that when exposed to sunlight, it turns yellow and loses its positive qualities. Therefore, it is recommended to use it in those places on the roof where the joints and crevices of the corrugated sheeting are in the shade, away from sunlight, especially direct sunlight.

There is another type of PU foam sealants - these are liquid mixtures. They are usually applied to the joints of corrugated sheets with a brush or roller; there are even cases when the application was made with a spray gun, after which a durable polymer layer that is one hundred percent waterproof was formed between the sheets. The guaranteed service life of the mixture is 20 years.

Many experts today give their preference to liquid polyurethane material. But today it is the most expensive sealant, although with the lowest material consumption.

Acrylic

A purely acrylic composition is not used for sealing corrugated sheet seams, because after three to four years it fails and simply begins to crumble, so it is recommended to use its siliconized version. This is a symbiosis of silicone and acrylic. True, there is one point in its use - it can only be used from the attic side.

Self-adhesive tapes

Today, sealants are increasingly being replaced by tapes and cords made from butyl rubber. They are self-adhesive, so there are no problems with installation and fastening.

Their positive qualities:

High moisture resistance;
Chemical resistance;
Good elasticity;
Withstands differences from -60C to +90C.

Conclusion

And in conclusion, we invite you to watch the video:

One of largest producers roofing materials company in Russia is considered to be TechnoNIKOL. The company's specialists have created completely the new kind bitumen shingles(Shinglas). TechnoNIKOL soft roofing is in demand in the low-rise construction market. The high quality of the products is evidenced by a quality certificate, namely ISO 9001.

Currently construction market offers 4 main types of roofing sealants.

This sealant has a number of characteristic features:

Disadvantages include poor resistance to high temperatures and the base color of the material is black.

Important! Because of high level toxicity, bitumen sealant cannot be used inside a residential area.

Rubber or silicone

This type of sealant is far from the last on the list of the highest quality:

Tape

Tape sealant is one of the most profitable and effective options for roofing:

The basis of this material is butyl rubber.
Sealant tapes have excellent resistance to low temperatures and ultraviolet radiation;
They are easy to install due to their high adhesiveness: just lay the tape on the surface and press it down.
Tape sealants are used for sealing between roofing sheets, chimneys and roofing, attaching thermal insulators, repairing cracks and rusty coatings.

Polyurethane

This sealant gives more possibilities due to its qualities:

Important! Not only is polyurethane sealant the best among other types today, it is also universal: it can work with metal structures, wooden and tile roofs.

For different types For roofs, there are corresponding sealants that, due to their advantages and disadvantages, may be ideal for one type of roof, but for another their effectiveness will be zero - and vice versa.

For metal roofing

To sealants for metal roofing there are a number of requirements:

high elasticity;
excellent adhesion to roofing materials;
increased resistance to vibrations;
low water absorption;
resistance to precipitation.

Bitumen and polyurethane sealants cope well with these tasks. To seal the seams of a metal roof, the surface must first be degreased and cleaned, dried, and only then a sealant must be applied.

Silicone sealants cannot be used on metal roofs as they cause rust.

For corrugated roofing

Corrugated sheeting is similar in properties to metal tiles: their sealing is similar: it is carried out when the roof slopes up to 14 degrees, while protecting the horizontal and vertical joints of the corrugated sheets.

Sealing of corrugated board joints is carried out according to the following rules:

when choosing a sealant, you should pay attention to polyurethane, acrylic and silicone samples - they give the best results, being excellent waterproofing agents;
Before sealing, you need to check the joints - they must be dry and clean;
the sealant is applied in an even layer of several millimeters, most conveniently - squeezed out or in the form of a polyurethane tape;
it is used to process joints, bolt attachment points and other unreliable parts of the structure;
The sealing process lasts 1-2 days and depends on the temperature and humidity.

After drying, the sealant becomes a durable rubber material that protects joints and connections from moisture.

Important! Sealing with the valley is carried out with a special profiled seal. Roofing sealant is used to process the seams of roof exit linings and the junction of the flooring itself with vertical walls.

For metal roofing

Despite its similarity to corrugated roofing, metal tiles have sealing features:

for gaps up to 5 mm, use silicone sealant or, as a temporary measure, aluminum butyl tapes;
as an option for sealant - professional gaskets that repeat the geometry of the flooring;
for a more reliable result, use ultraviolet-resistant silicone;
sealant is applied to the joints of the roofing carpet, outlets (ventilation, antenna), the edge of the chimney apron, and its joint with the roofing sheets;
with a roof slope of up to 14 degrees, the longitudinal and transverse joints of metal tile sheets are sealed.

Sealant for soft roofs

Today, soft roofing is one of the most popular types of covering. Its sealing occurs as follows:

for flat roofs, liquid rubber is used - bitumen-polymer emulsion or mastic;
For spot repairs, one-component is ideal liquid rubber– steam- and waterproof, elastic sealant;
Coating rubber is suitable for repairing sealing and waterproofing of joints and seams;
sealing mastic can be applied to surfaces of any humidity, has excellent adhesion to all materials and does not form swelling during operation.

Roof sealant "Titan"

Titanium is a one-component plastic sealant based on bitumen and rubber. It has a high degree of adhesion to wet and dry surfaces: aluminum, bitumen, metal tiles, roofing iron. Does not flow down the walls and is highly resistant to atmospheric conditions.

This sealant is used for:

sealing and updating seams and openings of all roofing surfaces;
sealing leaks on roofs made of bitumen, tiles, sheet and corrugated iron;
reinforcement of fasteners skylights and parts of the drain.

Two-component roofing sealant

The two-component sealant is based on silicone rubber. It differs from the previous one in vulcanization time and properties:

made in mastic, in a vacuum;
easy to apply;
application temperature – from -20°С to +40°С;
operating temperature – from -60°С to +70°С.
has excellent adhesion to wood, metal, brick, pvc, concrete;
the seam is strong and uniform.

Roofing sealant prices

The price of sealant varies depending on its characteristics and manufacturer. A 300mm package of sealant will cost on average:

bitumen - from 196 rubles;
polyurethane - from 155 rubles;
silicone - from 160 rubles;
tape - from 135 rubles.

Video

From this video you will learn how to choose the right sealant for various types roofs. An expert on roofing materials speaks.

Roof sealing is the most important aspect of the construction and operation of premises for any purpose. High-quality sealant and proper installation will ensure long-lasting and comfortable use of the roof.

IN last years seam roofs have become widespread both in private housing construction and during the construction apartment buildings And industrial facilities. When connecting separate seams with a folded seam metal sheets, which form the roof, create a reliable and leak-resistant coating. Fastening of roofing panels to the sheathing is carried out using clamps; This technology eliminates the need to through holes in the coating, which also contributes to its waterproofness. But even double seams rolled up using special equipment require additional sealing with sealant.

The importance of sealing seam seams

If there is a lot of snow in winter, and frosts alternate with periods of thaw, ice forms on the roof. Under the pressure of compacted snow masses and ice, the seams connected mechanically, without sealing with sealant, they can sag and diverge. As a result, when snow and ice melt, leaks occur, which leads to a number of undesirable phenomena:

the wooden rafter system, sheathing and counter-lattice begin to rot;
moisture penetrates inside the enclosing structures, causing their destruction and deteriorating thermal insulation;
Leaks through the floors and ceiling into rooms located under the roof are possible. The plaster turns yellow and crumbles, and fungus appears due to dampness.

Depressurization of folded seams is also possible in warm time years, if their compression was not done well enough. For example, hand tools were used, and the technology for working with a folding machine was violated. Double standing seams are the most resistant to leaks, while single recumbent seams are the most vulnerable. Roofs with self-latching locks, which are the most convenient to install, are also not reliable enough in terms of tightness. The lower the roof slope, the more intense the leaks.

In addition to the seams at the junction of sheets, the weak points of a seam roof are the places where the roof joins the walls, the places where pipes and antennas exit. Sealing of joints must be carried out during the installation of the roof. If the seams of the roof are depressurized and leaks occur, and the roofing material itself is not worn out, there is no need to re-cover the roof; it is enough to treat the seams with sealant.

When seam roofing leaks, patches of roofing iron or strips of soft roofing are also applied over the seams. This method can be used in addition to sealing with sealant, but it is not very effective on its own. Due to temperature changes, patches may lag behind the base, and strips of soft roofing may crack. Repeated bending and pressing of the folds also gives a temporary effect; under load, the seams will separate again. High-quality sealant retains its properties under the influence of ultraviolet radiation and temperature changes, does not crack and ensures tight connections for a long time.

Choosing a sealant for a seam roof

The composition for sealing seam seams and other roof joints must meet a number of requirements:

excellent adhesion to metal (if the sealant is used for joints between the roof and pipes, walls, it must have good adhesion to other building materials);
weather resistance;
UV resistance;
resistance to temperature changes;
elasticity;
vibration resistance;
durability;
impermeability to moisture and wind;
absence of components that cause metal corrosion.

Majority silicone sealants They are acidic and are not suitable for working on metal. Basically, for seam roofs, compositions based on modified bitumen or polyurethane are used. Butyl rubber sealant provides anti-corrosion protection to sheet steel and prevents moisture from penetrating joints. Polyurethane self-adhesive tapes with a double-sided working surface are easy to use.

Designed specifically for sealing seam roofs." Its advantages:

completely ready for use;
combines waterproofness with vapor permeability;
has low thermal conductivity, prevents heat leakage through roof seams;
has adhesion to a wide range of building materials, including galvanized roofing iron, suitable for sealing seams and various joints;
weather resistant;
can be applied with sub-zero temperatures(up to -15 °C);
provides sealing for 20 years.

Sealing process

Before applying the sealant, it is necessary to carry out preparatory work:

if the seams were previously sealed, you need to remove the remnants of the old sealant;
Rust (if any), dust and other contaminants are removed from the metal surface;
the seams are degreased;
the surface is dried.

If necessary, additional fastening of sheets to the sheathing is carried out. The sealing material is applied in accordance with the manufacturer's instructions. So, before applying Accent 128 polyacrylate sealant, the surface must be sanded to improve adhesion and slightly moistened, but there should be no drops of moisture or ice on it. Over folded seams and straight joints, it is most convenient to squeeze out the composition from a special one. To obtain an even and neat seam of the required thickness, construction tape is glued on both sides of the application site, which is then removed. Where communications exit, sealant can be applied to the joints using a spatula or brush. If the exit area is large, coating with mastic or sealant is not enough, a waterproofing apron is installed.

There is a sealing technology in several stages. First, polyurethane tape is glued to the prepared surface of the seam, and roofing iron patches are attached on top of it using rivets. The areas where the patch adheres to the roof are sealed with polyurethane mastic. Sandwich technology is reliable, but quite labor-intensive; the use of polyacrylate sealant allows you to achieve a similar result with less labor and materials.

Sealing result

If you apply sealant to a properly prepared surface, you can eliminate leaks and avoid them. reappearance. Complete polymerization of the Accent 128 sealant occurs within about a week from the date of work, and it practically does not shrink (up to 5%). The sealant is intended for seams with deformation up to 25%; it compresses and stretches as the structure moves. Even if the seam joints bend under the pressure of snow masses, the sealant will not collapse and will not separate from the connected surfaces. Thanks to it, the roof remains waterproof.

The use of Accent 128 sealant during the installation of a seam roof or its repair allows you to do without secondary sealing for 20 years. Repair may only be necessary if the roofing material itself is worn out or damaged.

For maximum reliable protection Seam roofing from leaks requires sealing of seam seams, especially single ones, since they easily diverge under load. All other joints that are vulnerable to leaks should also be treated with sealant. There are technologies for sealing seam roofs using various materials. Reliable and durable sealing is ensured by the easy-to-use Accent 128 acrylic sealant.