Roof device with a cold attic. Cold roof soft tiles Vapor barrier products for the roof

If you do not plan to do in the attic living room, the attic can be left cold - store some things here, arrange a workshop, hayloft, etc. The roof does not need to be insulated. How is a cold roof made of soft tiles, are there any features?

The device of a cold roof from a soft tile

The basic rule for cold attics does not depend on the coating: a full-fledged cake is made in the attic floor, otherwise the house will be cold.

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There are more insulation options on the floor than on a pitched roof: expanded clay, sawdust-clay mixture can be used as a heat insulator. The layer will turn out to be thick, but for an unexploited attic, this does not really matter. But cheap.

Otherwise, the cake is made according to all the rules: vapor barrier, waterproofing, the floor is sewn up with boards from above.

The second feature concerns ventilation. This is where the material differences come into play. Soft roofs (unlike profile metal) do not have waves that would serve as ventilation. The bituminous covering is completely tight, does not breathe.

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A ridge aerator for flexible tiles should be installed in any case, it does not depend on the roof structure or on its insulation.

Otherwise, the technology of a cold roof made of soft tiles differs from that of an insulated one: on cold roofs, a continuous crate can be laid directly on the rafters (without a counter beam). The entire attic serves as a ventilation gap. The crate and rafters are not closed from the inside.

Features of ventilation of a cold roof from a soft roof

When installing a cold roof, additional measures are taken to ventilate the attic:

v wooden houses with gable roofs on all gables, boards are loosely fitted, air penetrates through the cracks. This method is easy to perform, but it is not suitable for houses with stone / brick gables, as well as for hip roofs, which have no gables at all. Another disadvantage is that rainwater penetrates into the cracks along with the wind;

ventilation holes are made in stone and brick gables. Their total area is 0.2 percent of the area of the attic itself, otherwise it will not be enough for full ventilation. Ventilation grilles are placed with holes down so that rainwater does not flow into the attic;

hip roofs have one air vent located in the filing of the eaves, the second - at the ridge. Loosely fitted boards or perforated plastic soffits can be used as filing;

hipped and round roofs do not have a ridge. This will require the installation of point aerators.

More about ventilation soft roof I already wrote in one of the articles. You can get to know her.

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Approximate instructions for installing a cold attic on a soft tile roof

Due to the lack of a pie, it is easier to make a cold roof than a warm one:

1. Lay a solid sheathing of plywood or OSB on the rafters. Plates must be laid with a gap between the joints. Joints must be on rafter legs. Between adjacent plates/sheets - a technological gap of 3 mm. Fastening with screws or nails.

2. Underlayment: on flat roofs, cover the entire area of the roof.

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Installation of the carpet begins from below: the lining is rolled out along the cornice overhang and fixed with roofing nails after 20 centimeters. The upper strip is laid with an overlap on the lower one by 10 cm. The overlap of the transverse joint is 15 cm. All joints of the strips are sealed.

3. Install cornice drip strips over the edge of the carpet. Fix with nails in a zigzag after 10 cm.

4. Install the end strips in the same way.

5. In the valleys they lay over the lining. Fix the edges with nails after 20 cm.

6. The tiles are laid in rows from the eaves to the ridge. Installation of tiles on gable roofs starts from the end, on hip roofs - from the middle of the overhang.

7. Lay on top of the plank with an indent from the edge of 3-5 cm. Put on glue (or on a self-adhesive layer), fix with nails. The joints of the cornice strips should be closed with petals.

8. The next rows are laid so that the petals overlap the attachment points of the previous ones.

9. In the valleys and at the ends, the tiles are cut and put on glue. Fixation with nails.

Today, more and more developers are asking this question. The fact is that a cold roofing system allows you to build a residential building for relatively little money, when an insulated roof requires enormous costs both financially and in terms of time and effort. Realizing that such a system is in a sense better, many developers have wondered if a vapor barrier is needed under a cold roof?

Cold roof construction in a residential building

Many developers who want to save some money on construction seek to purchase the cheapest materials, but at the same time, so that the quality of the entire building does not suffer much from this. This is possible if, as truss system use primitive two slopes, corrugated board as a covering, and make the roof cold.

The design features of such a roof can be listed on the fingers, since there is no need to lay heat-insulating material, a vapor barrier layer and other components that are often found on insulated roofs. If you all doubt the savings, then it is safe to say that the cold version will cost 50-60% less than the insulated design. In addition, the work can be carried out independently, therefore, the savings will increase even more.

A cold roof pie, in most cases, includes the following products:

rafter legs
waterproofing material
Control lathing
crate
Profiled metal sheet

Do I need waterproofing under the metal roof of a cold roof?

It is worth noting that all metal surfaces have one similar feature, they collect condensate. Waterproofing, which is part of the roofing pie with a cold roof, will correct this problem and protect the room from incoming moisture, both from the outside and from the inside. When building an insulated roof, many developers advise their friends not to lay a vapor barrier layer if they are building a building with a cold type of roof. They think that the cold will remove the condensation that is visible on metal products, but they are very wrong.

Condensation occurs due to the temperature difference between the roof space and the external environment. Naturally, when the attic is not heated and not insulated with anything, the difference will be small, but still it is sufficient to provoke the release of moisture from the air. As you can see, condensate will form regardless of the type of roof, therefore, the question posed at the beginning of the paragraph can be answered unequivocally: yes, it is needed.

An example is outbuildings, the owners of which do not care much about their service life. In such buildings, the roofing cake is the most primitive and even violates building codes and regulations. Most often, a roofing cake consists of rafters, discharged lathing and roofing. All layers of vapor barrier and waterproofing were simply thrown out. Despite this fact, this building can stand for a significantly long period, or vice versa, fall apart after a couple of years. Here you are already lucky, but why take risks if you can do everything in a quality way?

Risks cannot be allowed on residential buildings, as someone's life may depend on it. I am not exaggerating, because if the condensate affects the truss system and other roof elements long time, then he will simply destroy them, which can lead to the fall of the entire roofing pie.

IMPORTANT: If at the beginning of construction you decided to build a cold roof, but later on after a certain period you will insulate it, then it is best to lay a microperforated film as a waterproofing product. Its properties are practically no different, but according to the price tag, it is much lower than membranes.

Waterproofing and ventilation of a cold roof

If you are laying a micro-perforated product, then such a layer will block moisture from the outside, but water vapor can pass through this area without problems. It can be said that the installation of vapor barrier products on roof slopes is not necessary in this case. After the steam penetrates inside, it is between the waterproofing material and the metal coating, from where it is removed by natural ventilation.

IMPORTANT: When using thick waterproofing film, retaining water vapor, this leads to a significant increase in air humidity and, as a rule, dampness in the room.

At high humidity air, condensation processes begin, so moisture accumulates on reverse side film penetrates into all roofing materials. In connection with this fact, for the construction cold roof it is not recommended to use such materials as: polyethylene and polypropylene, roofing material, and also glassine.

The ventilation system of cold roofs is quite simple. To create it, gaps are left, which, as a rule, are located along the cornice overhang. Air masses pass through them, collect all the humidified air and remove it through a cold triangle located in the ridge part of the roof.

The counter grille is a design to provide additional ventilation. Most often it can be found on complex roofing systems, where products with a high degree of waterproofing are used as a coating, for example, metal, shingles and others. The gap that is created by installing a counter-batten allows fresh air to dry the roofing pie from both sides, so structures with such a pie last much longer than the others.

Cold roof. Do buildings need waterproofing?

First of all, it should be noted that outbuildings differ significantly from residential buildings both in their structure and volume. The vast majority of developers are trying to save on the construction of secondary structures, so the issue of waterproofing is more relevant than ever. Before answering the question posed, let's deal with the coverage. To date, corrugated board is one of the cheapest materials, so I will talk about buildings covered with it.

Manufacturers different countries strive to produce such products so that the whole world begins to use it. If you are a fan of corrugated board, then today, such material is a sheet of metal with an anti-condensation coating.

In my own way appearance it practically does not differ from its counterparts. A synthetic composition is applied from the inside, it looks like felt. Due to the large number of pores, this material is able to retain square meter up to 1 liter of water. After the surface has been saturated with moisture, ventilation comes into play and if it is done in accordance with all the rules and regulations, then the drying process will not take much time.

Thanks to the laying of such a “cunning” coating, the need for laying a vapor barrier and waterproofing layer is removed, but it should be understood that the weight of such a coating will vary depending on weather conditions. When making the necessary calculations, it is very important to take into account these parameters and use them in the calculations. It is worth noting that the finished roof will be much cheaper, because it will not have almost half the roofing cake.

Installation of waterproofing for a cold roof

So, based on the information obtained above, you realized that the waterproofing material is laid regardless of the type of roof and the functional purpose of the building. However, if you want to save money, you can use roofing with an anti-condensation layer, but not all people like metal coatings, so I’ll tell you now general principle waterproofing installations.

First of all, an inexperienced roofer must repeat the safety precautions and the principle of working at height. After that, he puts on a special uniform, which should include the following: personal protective equipment, good shoes with non-slip soles and a mounting belt.
After the rafter legs are fixed in place, you can start laying the vapor barrier layer. It is attached to the rafters with a construction stapler and pressed against the crate. With a small slope, the strips of material are placed across the slope, and along the strongly sloped slopes. To improve the quality of laying this layer, the joints are smeared with bitumen or glued with double tape.

IMPORTANT: Before installing the crate, it is very important to treat its elements with special protective solutions that will increase the degree of ignition of the wood and protect it from decay.

Next, the counter-lattice is laid. It creates the necessary air gap, thanks to which moisture will be removed from the roofing cake.
A waterproofing material is laid on top of the konroblattice.
After that, proceed to the installation of sheets of corrugated board.

Most developers strive to cover as much length as possible with one strip of profiled sheet. This is justified by the fact that in this way fewer joints are obtained, therefore, the waterproofing qualities of the entire roof increase significantly. You can do all the work yourself, but to increase efficiency it is better to invite 1-2 partners.

Today, a cold roof made of metal tiles is often erected. Such a product is perfect if the attic space will not be used as a residential building.

It should be noted that today metal tiles are not the market leader in roofing materials. However, the owners of private houses find a large number of advantages in this material, so the demand for it is constantly growing. Many companies make metal tiles, so every owner of a private house will find a suitable option.

If you follow the manufacturer's instructions and follow the advice of experienced craftsmen, then there will be no problems installing this material.

Features of the installation of a roof made of metal are that it is necessary to provide an outlet for ventilation through which condensate will be removed. This is necessary in order to protect the carrier rails and roofing from the negative effects of moisture.

Before carrying out construction work, it is necessary to perform calculations, determine the angle of inclination, the step of the crate and choose the method of fixing the material.

To install a roof of this design, the following elements are required:

wooden boards;
vapor barrier;
waterproofing;
metal tile;
staples;
twine;
nails made of galvanized metal.

Features of a cold roof

Such a roof has a simple design. It differs from warm in its device. It is worth considering the option of roofing. When using metal sheets, it is necessary to provide a ventilation slot through which condensate will be removed from the space under the roof. In this case, the metal sheet will not corrode.

The device of such a roof is the installation of a rafter system, on which a polyethylene film is laid. After that, you need to nail the counter-lattice, the crate and the coating material. It is best to use a metal tile.

The features of such a roof are the absence of a heat-insulating layer, as well as the presence of exits for ventilation under the ridge and on the slopes, through which moisture will be removed. Design and installation are not complex processes, the main thing is to correctly perform all the calculations.

The installation process has the following features:

If you plan to install a warm roof, then special attention should be paid to the choice of a membrane to protect against excess moisture. For the attic device, you can use a membrane that is made of PVC.
If it is not planned to insulate the structure, you can use microperforated waterproofing, which is intended exclusively for cold metal roofing. Such a film does not allow materials for thermal insulation to be placed next to it, and therefore, in the process of insulation, a new membrane must be purchased. If this condition is not met, the roof cannot be protected from excess moisture, the insulation material will be wet, and the roof coating will begin to corrode.

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The sequence of actions for the device of the roof

In order to properly install the membrane, it must be taken into account that its installation is carried out with a slight sag.

Such a gap will allow air to move freely in the space under the roof, removing all the condensate. The membrane must not be damaged. The element is fixed with a construction stapler. Definitely need to do an overlap. The extreme parts of the film are attached with adhesive tape.

The features of the cold roof include the fact that it can be arranged in regions with any climate. Most people mistakenly believe that this type of roof is not suitable for the northern regions, but this is not the case. The attic floor will be insulated, so the use of such a design will not affect the indoor climate on the upper floors. The attic space can be left out, since installing a layer of insulation material between the last floor and the space under the roof can solve all the problems that relate to heat loss.

In the process of installing a roof of this type, it will be necessary to properly isolate technological gaps and exits.

To do this, all ventilation shafts, chimneys and entrances to the roof base must be thermally insulated. Thanks to this, the following troubles can be avoided:

the appearance of condensate;
ingress of precipitation;
heat losses.

To cover this design, you can use almost any material for the roof. In most cases, a metal tile is used, which is very easy to install. This option is considered the most preferable, since all laying actions can be performed in a short period of time, and no additional actions will be required in the future.

Flexible shingles can also be used. However, in this case, some difficulties may arise, which will make installation more expensive and difficult. Therefore, it is recommended to use metal sheets.

Before mounting the material, several preparatory operations must be performed. The main one is the calculation of roof slopes for flatness and squareness. There may be several slopes, but in the end you should get a flat plane. Otherwise, the sheets will not converge at the junctions.

For marking, you need a twine of such a length that you can block the diagonal of the slopes. The rope should be stretched from the top corner of the slope to the bottom. At the intersection, they should slightly touch.

Cold roof - what is it Cold roof - extremely simple design. A waterproofing film or membrane is placed on the rafters to protect the attic space from the formation

cold roof- couldn't be easier. Its name speaks for itself. The device of a cold roof does not provide for its insulation. Waterproofing is placed on the building saw, then a crate, on which the roofing is mounted.

How to make a cold roof from a metal tile

First, a waterproofing film is placed on the rafters, and if the attic is insulated, then more expensive material is laid down - a membrane that will protect the attic from leakage and condensate formed on metal roofing from the inside. A crate is attached on top, and they are laid on the crate roofing material. Moisture and vapors are removed with the help of special passages on the roof. In addition to this, dormer windows are used to ventilate the attic. The design scheme of a cold roof assumes a simple design, installation and operation. A modern metal tile in Kiev or any other city costs relatively little and will last a long time.

Installation of a cold roof

There are a few things you need to know before you start roofing your home. If the attic is to be insulated, a more expensive waterproofing membrane must be used. If there is no insulation, there is a cheaper waterproofing microperforated film that, when touching the insulation, allows water to pass through. It cannot be used for heating. You should not stretch the film too much, so that it sags a little. The sagging of the film allows water to drain to the middle of the run, thereby not falling on the rafters. Good ventilation is achieved, in this way special gaps are made in the waterproofing under the ridge.

This type of roof is also suitable for use in regions with severe frosts. The insulated attic floor implies that there can be no restrictions on the use of this roof according to the norms of the provided climatic zone. In cold weather, it is necessary to thoroughly insulate the ventilation devices so that condensation does not form and the roof does not freeze.

It is allowed to use any materials for a cold roof that do not need a solid base. Best Option there will be the use of durable and technologically advanced materials - these are profiled sheets or metal tiles. Now in the manufacture of profiled sheets and metal tiles, steel coated with a special powder is used in production, this greatly increases the service life of the material. If it seems that the profiled roof covering is not very beautiful, then there is an option to use metal tiles, it looks more aesthetically pleasing and exactly repeats the shape of natural tiles, but with the advantage of low weight and easy installation.

The description of the cold type roof can be considered complete. There is nothing difficult in this process if you follow the instructions and do everything according to the instructions, without neglecting the advice of specialists.

Cold roof - what it is and how it is mounted
A cold roof is no easier. Its name speaks for itself. The device of a cold roof does not provide for its insulation. Waterproofing is placed on the building saw, then a crate, on which the roofing is mounted.

If you do not plan to make a living room in the attic, you can leave the attic cold - store some things here, arrange a workshop, hayloft, etc. The roof does not need to be insulated. How is a cold roof made of soft tiles arranged, are there any features?

The device of a cold roof from a soft tile

The basic rule for cold attics does not depend on the coating: a full-fledged cake is made in the attic floor, otherwise the house will be cold.

note

Otherwise, the cake is made according to all the rules: vapor barrier, waterproofing, the floor is sewn up with boards from above.

note

Features of ventilation of a cold roof from a soft roof

When installing a cold roof, additional measures are taken to ventilate the attic:

in wooden houses with gable roofs, boards are loosely fitted on all gables, air penetrates through the cracks. This method is easy to perform, but it is not suitable for houses with stone / brick gables, as well as for hip roofs, which have no gables at all. Another disadvantage is that rainwater penetrates into the cracks along with the wind,

ventilation holes are made in stone and brick gables. Their total area is 0.2 percent of the area of the attic itself, otherwise it will not be enough for full ventilation. Ventilation grilles are placed with holes down so that rainwater does not flow into the attic,

for hip roofs, one ventilation hole is located in the filing of the cornice, the second - at the ridge. As a filing, loosely fitted boards or perforated plastic spotlights can be used,

hipped and round roofs do not have a ridge. This will require the installation of point aerators.

I already wrote more about the ventilation of soft roofs in one of the articles. You can meet her here.

Our work

Approximate instructions for installing a cold attic on a soft tile roof

Due to the lack of a pie, it is easier to make a cold roof than a warm one:

1. Lay a solid sheathing of plywood or OSB on the rafters. Plates must be laid with a gap between the joints. The joints should fall on the rafter legs. Between adjacent plates/sheets - a technological gap of 3 mm. Fastening with screws or nails.

2. Underlayment: on flat roofs, cover the entire area of the roof.

note

3. Install cornice drip strips over the edge of the carpet. Fix with nails in a zigzag after 10 cm.

4. Install the end strips in the same way.

5. In valleys, a valley carpet is laid over the lining. Fix the edges with nails after 20 cm.

6. The tiles are laid in rows from the eaves to the ridge. Installation of tiles on gable roofs starts from the end, on hip roofs - from the middle of the overhang.

7. The cornice row is laid on top of the plank with an indent from the edge of 3-5 cm. They are put on glue (or on a self-adhesive layer), fixed with nails. The joints of the cornice strips should be closed with petals.

8. The next rows are laid so that the petals overlap the attachment points of the previous ones.

9. In the valleys and at the ends, the tiles are cut and put on glue. Fixation with nails.

10. Triangular bars are installed at the junctions with pipes, walls, etc. The carpet and tiles are brought onto the bars, the edges are put on glue.

11. The direct connection to the pipe is treated with a valley carpet, covered with a metal apron, and the joints are sealed.

12. An aerator is installed on the ridge. Ridge aerators are included in the tile material kit. They are structurally different different manufacturers, the installation procedure for each is described in the instructions.

13. A ridge tile is placed on top of the aerator. Overlapping adjacent tiles is recommended to be done in the dominant wind direction.

Installation of flexible tiles is an energy-intensive task that requires accuracy. Our company STM-Stroy has more than fifteen years of experience in the installation of any roofs, we have qualified craftsmen.

We will perform for you a cold roof of soft tiles in a short time, with high quality and at a reasonable price.

Cold roof tiles
If you do not plan to make a living room in the attic, the attic can be left cold, the roof does not need to be insulated

Cold roof - what is it

A cold roof is an extremely simple design. A waterproofing film or membrane is placed on the rafters to protect the attic space from the formation of condensate that falls on inside metal roofs.

A counter-lattice is attached from above, after that - a crate, and then the actual roofing is already installed. Water vapor is removed from the under-roof space through special passages under the ridge and on the slopes.

In addition, ventilation of the attic space is also carried out through dormer windows. A cold roof is characterized by simplicity of design, so it is easy to design, install and operate.

There are a number of things to be aware of before starting installation. If you later intend to insulate the attic or turn it into an attic, you must use a TYVEK-class waterproofing membrane, since the waterproofing micro-perforated film for cold roofs is not designed for flush-mounting insulation. It loses its properties upon contact with it and passes moisture, as a result of which the insulation gets wet. If roof insulation is not planned, you can save money and buy a cheaper waterproofing microperforated film. It is necessary to pull it with a sag of 20 cm so that the water flowing down to the middle of the run does not fall on the rafters. To achieve unhindered ventilation, a special gap is made in the waterproofing under the ridge.

Some believe that this type of roofing is not suitable for areas with severe winters. This is not true: a cold roof and a cold attic are traditional solutions with a long history. If the attic floor is insulated in accordance with the standards established for a given climatic region, there are no restrictions on the use of a cold roof. It is enough to reliably insulate the ventilation equipment so that condensation and icing do not form.

As the actual roofing material for a cold roof, any materials that do not need a solid base are suitable. Optimal choice- corrugated board or metal tiles - reliable, technological and durable materials. Especially if in their production was used widely used in Lately powder-coated steel for extended service life. If the profiled sheet does not look aesthetic enough, then a metal tile is suitable, which reliably imitates the natural one, but differs in less weight and simple installation.

Cold roof - what is it
The general concept and options for installing a cold roof with your own hands. Cold roofing from metal tiles and corrugated board. Do I need to insulate a cold roof?

Today, in the construction of a residential building, various options for roof structures are used, but the simplest is a cold roof. Such a device is great when the attic space is not used as a residential additional space. The very scheme of such a roof is very simple: load-bearing structures, waterproofing, lathing and counter lathing, plus roofing material.

The installation features of such a cold roof are that it is necessary to provide a ventilation gap for condensate removal in order to protect not only the supporting structures, but also the roofing in the form of a metal tile from the negative effects of moisture.

The installation of such a roof itself does not differ in any difficulties, the main thing is to properly fix the profiled metal sheet so that precipitation does not penetrate through the joints under its surface. Before starting construction, you should make all the required calculations, calculate the angle of inclination, the step of the crate, decide on.

Features of a cold roof

A cold roof differs from a warm one in its design, although its design itself is extremely simple. The only thing to consider is the option of roofing. When using metal tiles, it is necessary to provide a ventilation gap for the correct removal of condensate from the under-roof space. This is done so that the steel sheet does not corrode.

The device of a cold roof is the installation of a truss system, on which a membrane or plastic film is laid for waterproofing. After that, a counter-lattice, a crate and a coating in the form of a metal tile are nailed.

The features of this roof are complete absence a layer of heat insulator, the presence under the ridge and on the slopes to remove moisture. Design and installation are not difficult, the main thing is to correctly carry out all preliminary calculations.

The installation itself includes the following features:

If it is planned in the future, then it is necessary to approach very carefully the choice of a membrane to protect against excess moisture. For the future attic, only specialized waterproofing in the form of membranes made of PVC is suitable.
If further insulation is not planned, then microperforated waterproofing is used, designed specifically for cold roofs. Such a film does not allow laying next to it thermal insulation materials, that is, with further warming, you will have to spend money on a new membrane. If this condition is not met, then the roof will practically not be protected from moisture in the future, the insulation will be constantly wet, and the roof covering will be subject to corrosion.

Sequence of work

To lay the waterproofing membrane, it must be remembered that its installation is carried out with some sag, approximately 20 mm. Such a device allows the condensate to drain, that is, the rafters and other roof elements are protected from moisture. In order for the water to evaporate effectively, and not to stagnate, creating an unfavorable atmosphere, it is necessary to ensure the presence of a ventilation gap, which is made between the waterproofing film and the roof ridge.

Such a gap allows air to circulate unhindered in the under-roof space, removing all traces of condensate. The roof protection membrane itself should not have ruptures or other defects; it should be fixed using a construction stapler.

Be sure to overlap, the edges of the film must be fixed with adhesive tape.

Of the features that distinguish a cold roof, it should be noted that it can be built for any climatic region. Many mistakenly believe that this type of roof is completely unsuitable for the northern region, but this is not so. It is here that a cold attic is a traditional solution for a residential building. Samo attic floor is insulated, that is, the use of a cold roof does not affect the internal microclimate of the upper floors. The attic itself may not even be used, since the installation of a layer of insulation between the upper floor and the under-roof space solves all problems regarding heat loss.

When constructing a cold roof, one should not forget about such a stage of work as proper insulation technological openings and exits. To do this, all ventilation shafts, chimneys, entrances to the roof surface must be insulated. This will avoid such troubles as icing, condensation, penetration of precipitation, heat loss.

To cover the roof of this design, you can use a variety of roofing materials. Most often it is a metal tile, the installation of which does not pose any problems. This option is considered optimal, since all laying work is carried out in the shortest possible time, no additional work is required. You can use other materials for coating, for example, flexible tiles. But here a number of technological difficulties already arise that can make installation more expensive and complicated. Therefore, the use of a metal profiled sheet is preferable in this case.

Roofing pie under the metal tile

The device of a cold roof under a metal tile is one of the most simple options. In addition to load-bearing structures, such a roof includes roofing material in the form of metal tiles, a crate, and a waterproofing layer. The installation of such a roof is very simple: a waterproofing film is attached to the rafter system using a construction stapler or small galvanized nails. After that, it is pressed with self-tapping screws on wood, with which the counter-lattice will be attached, the step of which depends on the type of metal tile sheet. The size of such boards should be 25 by 100 mm, in some cases a continuous coating of plywood or chipboard sheets is used.

A waterproofing film (it can be a special PVC membrane or a polyethylene film) should be laid on the roof with a slight sag. At the same time, gaps and other defects are unacceptable on it. The level of sagging of the roofing film should be from 15 to 25 mm. This will ensure proper ventilation of the underside of the waterproofing, removal of condensate from it to the eaves, and then to the gutter. If this is not done, it will be subject to the negative effects of moisture, and this will lead to destruction.

When installing a cold roof made of metal, it must be remembered that the metal sheet and a thin layer of waterproofing do not provide adequate protection against noise, which can occur during heavy rain. It is for this reason that cold steel sheet roofs are rarely made without insulation, which acts as an excellent sound insulator. Cold attic therefore it turns out to be unused.

The structure of such a roof includes the following mandatory layers:

From the side of the residential premises, first there is a layer of vapor barrier with one-sided permeability, that is, condensate is released from the room, but does not penetrate inside.
Roof truss system, longitudinal runs, that is, the supporting structure.
Waterproofing. The film should sag a little to allow condensation to escape.
Control grille, which is installed in parallel installed rafters. The boards of the counter-lattice press the waterproofing, providing its additional fastening.
The cold roof sheathing is made of wooden beam, the cross section of which is most often 50 by 50 mm. Its installation is carried out in increments of 35-45 cm along the slopes. The step may vary, as well as the material for the crate, it depends on what type of metal tile is used, what slope for the roof was chosen.
Sheets of metal tiles.

What else is required?

To install a roof with such a design, it is necessary to take the most simple tools and materials that are not very expensive. Besides wooden planks for the construction of the rafter system, battens and counter battens, a vapor barrier, a waterproofing membrane, and the estimated number of metal tile sheets should be prepared. Staples, galvanized nails, self-tapping screws for wood and metal are used as fasteners. When calculating steel sheets, it must be remembered that various additional elements may be needed, for example, ridge tiles, valleys, cornices, and so on.

The device of a cold roof differs from a warm one in that in this case a layer of insulation is not used, that is, there is no layer of insulation between the vapor barrier and the waterproofing membrane. Such roofs are applicable in the case when the attic space under them is not used.