How to insulate the roof if there is no counter-lattice. Counter-lattice for metal tiles: is this element needed in the roof structure? Installation of a counter-lattice under a metal tile

Each roof is a rather complex system, which, like a layer cake, consists of individual elements assembled into a single structure. Moreover, each element performs a specific function, so improper assembly of the "roof pie" will lead to disruption of its normal functioning. Therefore, if the question arises whether a counter-lattice is needed for a metal tile or if you can not waste time installing this element of the roof structure, then the answer can only be unambiguous - it is necessary!

The counter-lattice is important element roof, so its device should not be neglected. Many novice craftsmen mistakenly believe that building a counter-lattice is an unreasonable waste of material.

The owners of the house will feel the consequences of such savings already in the first winter. Due to the lack of air circulation in the under-roof space, moisture will accumulate, which will cause the most backfire– the formation of icicles and icings that destroy the metal-tiled coating, wetting insulation material and a decrease in the heat-insulating qualities of the roof, etc.

Functions performed by the counter-lattice

Non-professional builders often do not see the difference in the concepts of “battens” and counter-battens.” Meanwhile, these are two structures that perform dissimilar functions and have a dissimilar appearance. The crate can be sparse (lattice) or solid, but it is built in order to lay a roof covering on it.

Advice! The type and design of the crate is selected depending on the type of coating. So, under hard coatings, grating is usually performed, since its construction requires less material and, accordingly, its installation is cheaper. Under soft coatings, solid floorings are necessarily arranged.

The counter-lattice performs other functions, the structure is assembled to create free space between the individual layers of the roofing “pie”, to ensure ventilation.

Is a counter-lattice always needed?

In most cases, it is necessary to build a counter-lattice, however, when building residential buildings with non-insulated roofs, that is, if the attic is not supposed to be used, then it is allowed to exclude the counter-lattice from the roof structure. But in this case, it will be necessary to provide good ventilation in the attic space.

When constructing insulated roofs, the construction of a counter-lattice is mandatory. Moreover, it will be necessary to build this construction twice:

An internal counter-lattice is constructed between a layer of heat-insulating material and waterproofing.
An external counter-lattice is constructed between a layer of waterproofing material and a crate on which the roofing will be laid.

Arguments for the construction of a counter-lattice

When constructing a roof, it is worth thinking about the future. For example, even if at the time of building the house it is not planned to use the attic space, then no one can guarantee that in a few years the owners will not need to convert the attic space into an attic. For example, in the event that, due to an increase in the number of households, additional living quarters are required.

Therefore, if the possibility of using the attic in the future is not excluded, then it is worth arranging everything right away. necessary elements roofing cake, including counter-lattices. Otherwise, if it is necessary to carry out alterations, a complete reconstruction of the roof will be required, which is quite expensive.

The timely construction of the counter-lattice will not require significant time costs, and it will only slightly affect the total cost of construction. But in the future, if it is necessary to re-equip the attic, the presence of a ready-made counter-lattice will provide significant savings, both in time and finances. The presence of a counter-lattice on a cold roof cannot bring anything but additional benefits.

The counter grille is used not only to ensure ventilation of the space under the roof, with the help of this design it is created additional sound insulation. And this is especially important if you plan to use metal-based materials for roofing - metal tiles, corrugated board, etc. Since such materials conduct sound perfectly, which creates certain inconvenience for residents of the house during rain.

Another important argument that favors the construction of the crate is that this design can be used to level the flatness of the slope if inaccuracies were made during the installation of the rafters.

Basic rules for mounting the counter-lattice

As a rule, the counter-lattice is assembled from wooden bars. Lumber must be well dried and not show signs of mold damage.

Advice! The cross section of the bars for the construction of the counter-lattice is selected depending on the size of the roof. Most often, bars with a cross section of 50 mm are used. If a large building is being built with a roof of a significant area, it may be necessary to use bars with a large cross section.

The step of the elements of the counter-lattice always coincides with the step of the rafters, since the bars are stuffed exactly on the rafter legs.
The material for the construction of the counter-lattice is recommended to be pre-treated antiseptic impregnations, this will help ensure a longer service life of the entire structure.
The fastening of the bars to the rafter legs is carried out by driving nails made of galvanized steel. Attachment points are arranged in increments of 30 cm.

So, the counter-lattice under the metal tile is a functional element of the roof structure. This design is necessary to ensure ventilation of the space between the layers of the roofing cake. Removing moisture from the under-roof space avoids premature destruction of wooden and metal elements roofs.

Modern methods of laying roofing bear little resemblance to traditional ways installation. For example, thanks to the use of metal tiles and corrugated board, the concept of a counter-lattice has come into use for roofers. What's this? Is it really necessary? What functions does it perform and how is it installed? Let's try to figure it out.

Do you really need a counter-lattice for a metal tile?

Laying metal roof tiles is expensive. It is not surprising that, wanting to save money, most of the owners may be perplexed about the need to manufacture a counter-lattice. Is it really necessary to install it? Is it possible to do without it? In short technological process arrangement metal roofing, implies its use. An omission in this matter is a gross violation and can lead to a sharp decrease in the life of the metal tile. It turns out that the manufacture of the counter-lattice is justified and justified. But what is its function?

The main purpose and functions of the counter-lattice

There are several main purposes for installing a counter-lattice, each of which significantly affects the timing and quality of operation of metal roofing materials. It performs the following functions:

Provides unhindered air circulation. A feature of the roofing cake, which is made under the metal tile, is good thermal insulation roofs. The disadvantage of this design is the increased formation of condensate. To reduce the negative consequences of this, a counter-lattice is arranged. It allows you to remove harmful moisture from the roofing cake with the help of a constant supply of fresh air.
Creates additional noise and heat insulation. The space that appears due to its installation creates an air gap. It effectively copes with the functions of the barrier and increases the isolation of the room from extraneous noise.
Eliminates irregularities in the truss system. Even the use of perfectly even timber as rafters does not guarantee an ideal roof plane. The control grid allows you to eliminate small irregularities

Attention! According to the technology for slate and soft roofing materials, there is no need to install a counter-lattice, but for metal tiles and corrugated board, its use is mandatory.

Why is it necessary?

The main function of the counter-lattice remains the creation air gap in which air can circulate freely. This achieves the following:

The service life of the metal tile is increased. During installation, the integrity is violated varnish coating, which is applied to the sheets as a protective layer. Even if used necessary tools in places of fastening or cutting off the varnish is destroyed. Over time, if the necessary conditions are not provided, rust appears and, as a result, the roof begins to rot. To prevent this from happening, you need to create a natural removal of moisture from the roofing pie. The counter-lattice just performs this function.
Provides additional space for laying thermal insulation. With the help of a counter-lattice, it turns out to make the so-called "warm roof". This is especially important if you plan to use the attic for living quarters. But even if a “cold roof” is made, such a device can reduce the heat loss of the building.
Provides better work results. As already noted, with the help of a counter-lattice, it is possible to eliminate minor defects in the truss system and irregularities of 1-2 cm.

Another one additional function control battens are a reliable fixation of the hydrobarrier to the roof rafters. Initially, it is attached with a stapler. Start from the bottom row. Roll out along the plane of the roof. Each subsequent row is overlapped (at least 10 cm) with the previous one. After installation, a bar is stuffed in the center of each rafter, which plays the role of a counter-lattice. It additionally fixes the material. To avoid the rusting process, it is necessary to fasten the bars to the rafters with the help of special screw nails.

The counter-lattice is made of a beam with a section of 3/5 cm. It is nailed to the rafters strictly in their middle. Between themselves, the timber is connected by washing down, this provides a stronger grip. After that, the crate is laid. It is important to know how to make a crate for a metal tile. It is made from a planed board 3/10 cm thick. The pitch of the crate is determined by the roofing material, or rather its wavelength. For a metal tile, as a rule, such a difference is 35-40 cm. This is due to the fact that it must be laid, clinging to the edges of the board with an internal wave. Mounting process roofing material happens like this:

The hydrobarrier is laid
The counter-lattice is fixed
Roofing cake being made
The crate is sewn on

Attention! If a "cold roof" is made, there is no need to use thermal insulation.

Usually the step of the counter-lattice completely coincides with the distance between the rafters. In this case, it is enough to attach the beam in the middle rafter leg. Sloping roofs may require this gap to be reduced. If a small angle of inclination is used, it is necessary to increase the thickness of the timber used.

It is not difficult to install a counter-lattice. The installation process goes like this:

Training. The edges of the beam, at the junction, are sawn at an angle
The hydrobarrier is sewn on
The prepared beam is sewn onto the rafters using galvanized nails.

At the junction with the valley, the timber should be sewn, not reaching the edge by 10-15 cm. This makes it possible for the debris that appears during installation to slide down unhindered.

The counter grill must be installed for any type of metal roof, even if the decision is made not to insulate the roof
The smaller the angle of inclination of the roof slope, the thicker the beam used as a counter-lattice should be.
It is necessary to fasten the bars with the help of galvanized screw nails. This will prevent rust from showing through at the attachment point.

Do not ignore the importance of the counter-lattice, a relatively small investment will significantly increase the life of the metal tile.

Are you just about to build a house? Not sure which roofing material to choose in the future? What's better: soft roof or metal tiles? All materials have advantages and disadvantages, but if you count all the pros and cons, then the metal tile is the best option from all roofing materials.

To date, the most popular is the metal tile Rukki. Read more about Rukka metal roofing here. This material is durable high quality and unique appearance.

Is it worth it to make a counter-lattice? Advantages of a counter-lattice for a metal tile.

The thickness and size of the counter-lattice under the metal tile. Installation of the counter-lattice.

Each roof device consists of a large number of elements that perform their functions during the device reliable protection spaces inside the house from various influences external factors. In addition, the elements are able to provide comfortable living for the inhabitants.

The device of a counter-lattice under the metal tile will provide ventilation of the roof and will allow creating additional heat and noise insulation.

The counter-lattice under the metal tile as part of the roofing pie and the rafter system plays an important role.

In this material, the purpose of this element will be described in detail, and counter rails will also be installed.

Main functions of the counter grille

In no case should you confuse the concepts of battens and counter battens.

The lathing can be made of bars or boards and be either solid, for roll roofing, or with a certain step.

This is due to the fact that they different kind and features, as well as the different sequence of the installation process. If a batten, sparse or solid, is required as a base for a roof covering, a counter batten must be provided to create a ventilation space between the waterproofing and the roof covering.

The lathing can be made of bars or boards and be either solid, for roll roofing, or with a certain step. Everything will depend on the roofing.

The counter-lattice is basically bars that have a cross section of 25x30 mm.
The step of the counter-lattice will coincide with, because they are stuffed on them precisely on top of the laid hydro- and vapor barrier.
On rooftops that have big size, bars for the counter-lattice can be selected with a large cross section. These bars will prevent the roofing material from adhering tightly to the waterproofing, which will contribute to the best level roof ventilation and removal of moisture that forms on insulated roofs, while they simultaneously play the role of a pressure element, which is necessary for hydro and vapor barrier.
A crate is arranged along the counter-lattice, which will correspond to the selected roofing.

Do I need a counter-lattice for metal tiles in my own house

With the help of counter-rails, it is possible to align the horizontal plane of the slope, if miscalculations were made during the installation of the rafters.

To the question of whether a counter-lattice is needed or not, one can confidently answer that it is needed, despite the fact that it is far from being always performed. On simple non-insulated roof structures, where it is not planned to arrange a heated living space in the attic space, most often they do not make a counter-lattice.

However, no one can say with certain accuracy that after a while the owner will not come up with the idea of doing it anyway. living room from the attic. Even on cold roof structures, counter rails and the presence of hydro and vapor barriers will only benefit.

In addition to ventilation of the space under the roof, additional heat and noise insulation will be created. The ventilated space under the roof will contribute to the long life of the entire roof without the need for any repairs.

The counter-lattice can make it possible to level the horizontal plane of the slope in case miscalculations were made during the installation of the rafters. All of the above can sufficiently convince that it makes sense to install a counter-lattice.

The cross-section of the bars for the counter-lattice must be selected depending on the slope of the roof and the roof covering used.

The material with which it is planned to produce the roof is laid on the crate, which must be made of coniferous wood. The moisture content of the tree should be about 20%.
Boards or bars that are used for the installation of counter-battens and battens should not have blue, knots, should be completely even along the entire length.
The cross-section of the bars for the counter-lattice must be selected depending on the slope of the roof and the roof covering that is used.
For roofs that have a slope of less than 30 degrees, the section of the bars must be large, because the weight of the roofing material on roofs that have a small slope will give a large load to almost the entire area of \u200b\u200bthe slope of the roof structure.
In the case of large slopes, the loads from the weight of the roofing material will be borne by the lower parts of the roof slopes. Therefore, when using ceramic tiles, which has a significant weight, the thickness of the counter-lattice will have a different value.
At the bottom, the cross-section of the slats should be large, while the middle bars can be smaller, and at the top, where the loads associated with the weight of the tiles are minimal, it makes sense to fill the thinnest counter-battens.

Correct arrangement of the base for the counter-lattice

Scheme of a roofing pie of a metal roof.

The roof pie is a fairly complex system that consists of a large number of elements. This can be especially important in the process of laying roofing metal tiles, which places particularly high demands on the quality of work. In such a case, you may need a heater in the form of mineral wool, it is necessary to have an intermediate crate, a membrane for waterproofing, a counter-crate and a crate, on which the metal tile will be laid.

Similar from the crate and film will act as the basis that is able to ensure the quality, durability and reliability of the entire roof structure, good protection from humidity, bad weather, snow and so on.

Which hydrobarrier can fit

Any roofing pie necessarily includes a waterproofing layer that will protect the roof structure from moisture. The main task of such a membrane is to save the under-roof space and insulation from atmospheric moisture. In such a case, the materials that should be laid during the construction of the roof can be protected from getting wet, mold, and gradual destruction under the influence of water.

Such a layer will work together with the air gap, which can allow moisture to be quickly and efficiently removed.

The hydrobarrier is most often laid directly on roof structure, however, when laying metal tiles, the order should be slightly changed.

First of all, the selected insulation should be laid between the rafter legs (most often this mineral wool), after that you need to make an intermediate crate, which will allow you to provide a gap small sizes between materials. Only after this is the process of fixing the waterproofing.

In such a case, mineral wool will be able to ventilate well, and the membrane itself will be able to work more efficiently.

Laying waterproofing must be carried out as follows:

The film should not be fastened with nails without the use of counter rails and mounted with an interference fit, it is best to provide a slight sag of the film.

The film needs to be rolled out about the roof, from the eaves to the ridge, while pulling it.
Each of the sheets is laid with an overlap of 150 millimeters in order to avoid possible moisture leakage. First you need to put bottom sheet, after that - the stripes closest to the ridge so that the overlap looks down.
The waterproofing must be attached to the rafter legs using a construction stapler.
During installation, it is important to ensure that the membrane is not stretched. It is best to leave some sagging (but never creases).
After completing these steps, it will be possible to lay the counter-lattice of the roof from the metal tile.

The sequence of installing a counter-lattice in your own home

After the rafter legs have been successfully installed, hydro and vapor barrier should be laid on them.

For temporary fixing of insulating materials, use construction stapler, which makes it possible to quickly and easily attach roll materials to the rafters.

Insulation for metal tiles should be laid from bottom to top across the roof slope, with an overlap of at least 10 centimeters. Next, it will be necessary to install the counter-lattice. Bars for this design must be made with a size of about 1.5 m and a section of 30x50 mm (50x50 mm should be used on roofs that have complex structure and great length rafter legs).

In the place where the roof valley is made of metal tiles, the counter rails must necessarily deviate from inner corner 8-10 cm in both directions. They must be nailed to the longitudinal boards that form the corner of the valley.

The resulting free space will help not to delay construction garbage, which is formed during the roofing works, and will facilitate the drainage of water without obstruction. The bars should be nailed to the rafters every 30 cm using galvanized nails.

Metal tile roof grate

Such a roof structure is quite simple and quickly mounted.

For metal tiles, you should use bars that have a length of 1350 to 1370 millimeters and a standard section of 30x50 millimeters. Fastening must be done with galvanized nails with a pitch of 300 millimeters.

In the process of installing a counter-lattice for a metal roof, you will need to connect the upper ends of the bars from opposite slopes by washing down. The end result should be a strong connection. Subsequently, this may make it possible to carry out more accurate calculations battens for this roofing material and perform the installation of the correct ridge.

In addition to the fact that the counter-lattice construction for metal tiles is used on roofs, it is also used on vertical surfaces while the process is being carried out. external insulation walls. This will create an air space between the insulation and the facing material.

Condensate will not fall on inside cladding on the surface of the insulating material. If the house is planned to be sheathed wood paneling, this will have to be done in order to keep the cladding of the house intact for a long time.

Such a roofing pie will make it possible to solve such problems as:

more secure fastening roof membranes made of metal tiles;
arrangement of a reliable frame for the crate;
receiving air gap for proper ventilation.

Modern roofing methods bear little resemblance to traditional installation methods. For example, thanks to the use of metal tiles and corrugated board, the concept of a counter-lattice has come into use for roofers. What's this? Is it really necessary? What functions does it perform and how is it installed? Let's try to figure it out.

Do you really need a counter-lattice for a metal tile?

is expensive. It is not surprising that, wanting to save money, most of the owners may be perplexed about the need to manufacture a counter-lattice. Is it really necessary to install it? Is it possible to do without it? In short, the technological process of arranging a metal roof implies its use. An omission in this matter is a gross violation and can lead to a sharp decrease in the life of the metal tile. It turns out that the manufacture of the counter-lattice is justified and justified. But what is its function?

The main purpose and functions of the counter-lattice

Provides unhindered air circulation. A feature of the roofing cake, which is made under the metal tile, is the good thermal insulation of the roof. The disadvantage of this design is the increased formation of condensate. To reduce the negative consequences of this, a counter-lattice is arranged. It allows you to remove harmful moisture from the roofing cake with the help of a constant supply of fresh air.
Creates additional noise and heat insulation. The space that appears due to its installation creates an air gap. It effectively copes with the functions of the barrier and increases the isolation of the room from extraneous noise.
Eliminates irregularities in the truss system. Even the use of perfectly even timber as rafters does not guarantee an ideal roof plane. The control grid allows you to eliminate small irregularities

Attention! According to the technology for slate and soft roofing materials, there is no need to install a counter-lattice, but for metal tiles and corrugated board, its use is mandatory.

Why is it necessary?

The main function of the counter-lattice is the creation of an air gap in which air can circulate freely. This achieves the following:

The service life of the metal tile is increased. During installation, the integrity of the varnish coating is violated, which is applied to the sheets as a protective layer. Even if the necessary tools are used, the varnish is destroyed at the attachment or cut points. Over time, if the necessary conditions are not provided, rust appears and, as a result, the roof begins to rot. To prevent this from happening, you need to create a natural removal of moisture from the roofing pie. The counter-lattice just performs this function.
Provides additional space for laying thermal insulation. With the help of a counter-lattice, it turns out to make the so-called "warm roof". This is especially important if you plan to use the attic for living quarters. But even if a “cold roof” is made, such a device can reduce the heat loss of the building.
Provides better work results. As already noted, with the help of a counter-lattice, it is possible to eliminate minor defects in the truss system and irregularities of 1-2 cm.

Control grate and hydrobarrier

Another additional function of the counter-batten is the reliable fixation of the hydro-barrier to the roof rafters. Initially, it is attached with a stapler. Start from the bottom row. Roll out along the plane of the roof. Each subsequent row is overlapped (at least 10 cm) with the previous one. After installation, a bar is stuffed in the center of each rafter, which plays the role of a counter-lattice. It additionally fixes the material. To avoid the rusting process, it is necessary to fasten the bars to the rafters with the help of special screw nails.

Lathing and counter-latting for metal tiles

The counter-lattice is made of a beam with a section of 3/5 cm. It is nailed to the rafters strictly in their middle. Between themselves, the timber is connected by washing down, this provides a stronger grip. After that, the crate is laid. It's important to know, . It is made from a planed board 3/10 cm thick. The pitch of the crate is determined by the roofing material, or rather its wavelength. For a metal tile, as a rule, such a difference is 35-40 cm. This is due to the fact that it must be laid, clinging to the edges of the board with an internal wave. The process of installing roofing material is as follows:

The hydrobarrier is laid
The counter-lattice is fixed
Roofing cake being made
The crate is sewn on

Attention! If a "cold roof" is made, there is no need to use thermal insulation.

Calculation of the counter-lattice step

Usually the step of the counter-lattice completely coincides with the distance between the rafters. In this case, it is enough to attach a beam in the middle of the rafter leg. Sloping roofs may require this gap to be reduced. If a small angle of inclination is used, it is necessary to increase the thickness of the timber used.

How is the installation of the counter-lattice

It is not difficult to install a counter-lattice. The installation process goes like this:

Training. The edges of the beam, at the junction, are sawn at an angle
The hydrobarrier is sewn on
The prepared beam is sewn onto the rafters using galvanized nails.

At the junction with the valley, the timber should be sewn, not reaching the edge by 10-15 cm. This makes it possible for the debris that appears during installation to slide down unhindered.

The counter grill must be installed for any type of metal roof, even if the decision is made not to insulate the roof
The smaller the angle of inclination of the roof slope, the thicker the beam used as a counter-lattice should be.
It is necessary to fasten the bars with the help of galvanized screw nails. This will prevent rust from showing through at the attachment point.

Do not ignore the importance of the counter-lattice, a relatively small investment will significantly increase the life of the metal tile.

Are you just about to build a house? Not sure which roofing material to choose in the future? All materials have advantages and disadvantages, but if you count all the pros and cons, then metal tiles are the best option of all roofing materials.

To date, the most popular is the metal tile Rukki. Read more about Rukki metal tile. This material is durable, high quality and unique in appearance.

Video about the counter-lattice under the metal tile

Is it worth it to make a counter-lattice? Advantages of a counter-lattice for a metal tile.

The thickness and size of the counter-lattice under the metal tile. Installation of the counter-lattice.

The roof serves as the protection of our home, therefore, its arrangement should be approached very carefully, carefully, without deviating from the installation rules. One of the features of the roof installation is the arrangement of the counter-lattice. How to make a counter-lattice for corrugated board, what are the nuances of this stage of roof construction, and also - what functions do the crate and counter-bars perform? This is discussed further.

Not everyone understands the purpose of the counter rails, so they are often confused with the crate. However, the functions of these elements of the roofing cake are somewhat different. To understand what is the difference, it is necessary to describe these structural elements.

The crate is made up of rows of boards that are nailed to truss system. It can be solid or sparse. The step between the boards in a continuous crate is less than a centimeter. This design allows you to isolate noise, retain heat. Discharged crates are more often used on corrugated roofs. They are constructed from bars measuring 50x50 millimeters. Crate boards are nailed onto the counter-crate.

The control grille is made from wooden beams stuffed on the rafters, directly on the waterproofing. The counter beams allow air to circulate between the waterproof foil, the batten and the profiled sheets.

Often, condensation forms on the coating, inside, which ultimately leads to rotting of the entire roof structure. The counter bars act not just as a frame for the crate, they contribute to the removal of moisture. The counter-lattice is made of bars with a section of 30x50 mm.

Functions of counter grilles

It's no secret that before laying corrugated board, the roof is covered with a film designed to protect against moisture. Therefore, counter bars - necessary condition roof arrangement. Let's explain. Between the waterproofing sheet and the crate, it is imperative to leave a ventilation gap. This gap can be provided by mounting counter rails.

The most relevant is the use of counter-beams on sloping roofs. Also, you can’t do without it in the case of using corrugated board with a wave height of up to 21 millimeters. In both cases, there is a risk of sagging roofing material. Therefore, being reinsured, builders make frequent or solid crate. This requires the arrangement of an additional gap between the crate and waterproofing. You can achieve it with the help of counter bars. The following functions are assigned to the counter-lattice:

Provides creation ventilation gap(it should be 5 centimeters)
It helps to ensure that the waterproofing film does not come into contact with the boards of the crate. The fact is that condensation often accumulates on the waterproofing film. Thanks to the counter-lattice, it flows freely over the film without harming wooden elements roofs.
The counter-lattice under the corrugated board provides straightening of the waterproofing material, so that it does not sag.

What are the crates

There are other functions for counter bars. For example, if the rafters are carelessly trimmed, they can be leveled before installing the main crate by stuffing additional planks. In addition, the counter-lattice can be used as a support for temporary, mounting battens, which are relevant for builders to move on a roof covered with waterproofing. In this case, the counter bars will not allow damaging or tearing the waterproofing.

Choosing wood

What tree is most suitable for arranging counter rails? This question is asked by many builders, especially those who are not professionals. First of all, the choice of material depends on what kind of roof you choose, or rather, what material it will be built from. So, if you are planning to make a heavy metal roof, ideal solution will be the choice of pine or oak.

When covering the roof lightweight materials(as in our case - corrugated board), soft wood is used. The height of the system of counter-rails varies from two to five centimeters.

Installing counter bars

Installing counter bars is not at all difficult. After laying and fixing the waterproofing layer, parallel to the main rafters, stuff the planks-bars, which should be prepared in advance. At what you should work very carefully, otherwise there is a risk of damage to the waterproofing film.

When choosing planks, give preference to those that are a little more than a meter in length. It is possible to calculate the length of each bar so that there are three bars at the height of the roof, the gaps between them should be 15-30 centimeters.

The bars of the counter-lattice are quite convenient for arranging the corner of the roof ridge. To do this, simply saw down the tops of the planks so that they form a roof corner. And you are already mounting the skate on it. This greatly facilitates the work of forming a ridge corner with the main rafters.

As you can see, it is not difficult to build a device, it does not require additional costs. At the same time, it performs many functions. Therefore, do not ignore the arrangement of the counter-lattice and do not bypass this stage of roof construction.