Fastening the valley rafters in complex roofs. Roof valley: what is it, device and installation

It is important to build a valley in such a way as to withstand the elements of nature, as well as protect the roof of the house from leaking and, possibly, blowing off the roof by gusts of wind.

What is endova?

If you finish home construction, then one of the most important things remains the device of the roof valley. The valley or groove is the junction of the roof slopes, which takes on the lion's share of the roof loads:

• heats up in summer to a high temperature;
• rainwater flows down to this joint;
• snow cover load is the highest here.

A natural disaster for a house can be prevented or its consequences reduced if the valley firmly holds the corner blow. For the correct calculation of the structure of the house or its individual parts, you can contact the specialists of InnovaStroy. In order to order a free calculation, you can fill in contact information and leave a message on the calculation parameters on the main page of the company's website. Going to home page, you need to scroll the page from the top one row, press the button "Order a miscalculation for construction - for free!"

The bottleneck of the whole house

What is the need for a proper valley device? The weakest point of any structure is the place where there is a connection. It is here that all negative external influences on the structure can most quickly appear. The valley, which connects two, three, and sometimes more parts of the roof, is the bottleneck in the design of any structure, both in the private construction sector and in commercial buildings.

An incorrectly constructed or incorrectly calculated valley can cause the beginning of the destruction of the roof, under certain circumstances, the entire roof, and sometimes the entire house. If you approach laying the valley unprofessionally, without calculations and certain knowledge, you can get the most negative consequences. If we know in advance what it is necessary to protect the house from, we can make sure that the junction of the slopes is a reliable connection for many years. InnovaStroy specialists have extensive experience in successfully carrying out the most complex roofing works, including the installation of a roof valley. The company can also order a comprehensive service, including house design, repair of the roof and roofing, as well as the design of a new or reconstruction of an existing roof, installation or a full cycle of roofing work, which will be performed by professionals.

How to build a valley correctly?

No matter what the roof is built from, no matter what material is chosen for the roof, there are general laying rules, a diagram of the valley device:

1. First, a solid wooden crate is attached at the junction of two roof slopes.

2. From below, the valley is reinforced with roofing tin or other suitable building material. It must be waterproof, resistant to temperature extremes. It can be, for example, one of the options for waterproofing carpets.

3. The crate is assembled first from a solid boardwalk.

4. The flooring is covered with an asbestos-cement (slate) tray or a tray made of galvanized steel. This is also called the lower valley. The edge of the tray should protrude forward, beyond the border of metal tile parts, slate sheets or corrugated board. This will ensure the rigidity and reliability of the structure.

5. The last step in the construction of the valley is laying above all roofing sheets, the upper valley. Usually the upper valley is a part of the same material from which the entire roof is made. The upper valley is not a mandatory element of the roof, but it gives the building complete aesthetic look .

Sometimes laying the upper valley may be abandoned for the following reasons:

• it is necessary to organize a large drain capacity;
• the passage of melted snow, into which particles of branches, leaves and other debris often fall, goes better with an open type of valley;
• it is necessary to improve the passage of the flow of melt or storm water for a roof with a small angle of elevation of the slopes.

We talked about the basic rules for arranging a valley, but besides this, they have many features. The most important factor influencing the valley laying technology is the roofing material. The valley is, in fact, part of the roof, therefore it must be a continuation of it and be combined in color and material of manufacture. It is important to observe these technological features when completing roofing, which we will discuss further. If you carefully read all the tips, you may well try to install a valley on the roof on your own. If you are not confident in your abilities or you do not have consultants with experience in construction, still the best option is to contact those who know how to build this important part of the house. Our advice will help you understand how the valley works and how to build it correctly, even if you are not a builder, but a customer of the service.

How will the valley save the house?

The principle of operation of the valley is based on the drainage of water under the action of the angles of the slopes:

• along the grooves, gutters or roof profile, moisture, snow or water flows down to the gutter of the valley;
• the gutter receives the flow and directs it down the roof;
• independently or with the help of a drain, the water stream merges to the ground.

The valley should be, based on the tasks set by the front roof structure:

• strong enough to hold the flow of water or sliding snow, ice
• additionally waterproofed to eliminate possible leakage of the roof near the gutter.

To take into account all the features of laying the valley, you should know the simple rules worked out by professional builders.

The device of the roof valley from a metal tile

The metal tile is the modern queen of roofing, because it has a beautiful appearance and excellent performance. When it comes to metal tile roofing, the roof is formed according to the general scheme that we described above. First, a crate is arranged, and then a standard sheet of metal tiles is laid, specially prepared in the form of a gutter. From above, after the installation of all roofing sheets, the upper valley is also attached.

During the installation of a metal tile valley, it should be remembered that a wooden crate needs to be made:

• solid, without voids at the junction;
• lathing material - boards not less than 150 by 25 mm;
• the width of the crate from the center of the joint must be at least 300 mm on both sides.

After the crate is formed, it is required to lay waterproofing - a special rug or any other building material resistant to moisture and stress. The lower valley is fixed with self-tapping screws with a pitch of at least 300 mm. two edges of the slopes, the overlap must be at least 10 cm. In the interval between the lower valley and the metal tile, it is recommended to lay a sealant that will expand under the influence of heat and seal the joint.

Device of a valley on a slate roof

Slate is a roofing classic. These corrugated sheets of asbestos cement are cheap and easy to work with, although more fragile than metal tiles.

The installation of a valley on a slate roof preserves the main stages of installing a valley with a metal tile. On the finished wooden crate-frame, a slate sheet is laid, which is specially prepared at the factory for the lower gutter. The upper valley is laid after the installation of the entire roof. The lathing for the slate valley is made of beams with a section of at least 60 by 60 mm. If the roof sheathing can pass with pauses in laying, then the valley requires a full sheathing. On top of the formed wooden gutter, a slate part is laid, usually factory-made. Slate blanks begin to be fastened with thick and large slate nails from the bottom to the top of the roof.

If there is no such slate figure, you can use a metal base for the lower valley. Slate sheets should overlap the edge of the lower valley by 10-15 cm. Sometimes, in the slate version, the upper valley is not made to increase the flow of melted snow or a large flow of water during heavy rains. This scheme is practiced in places with high humidity and a specific climate.

Device valley from corrugated board

Profiled roofing has been used for a long time, although such a coating is not fashionable for houses - it looks too simple. But corrugated board does not lose ground, because it is inexpensive and easy to process, which is a very important indicator for any construction site. There are no differences in the installation of the valley in comparison with metal tiles and slate, although there are some peculiarities. For lathing, you can use a continuous row of boards with a cross section of at least 32 by 100 mm and a distance of at least 50-60 mm from the center of the valley. The valley bar must enter under the main cover of the corrugated board by at least 250 mm.

Other methods of arranging a valley

Roofing is not always made of popular materials. Sometimes it is required to make a valley for a soft roof, for example, from rolled modified bitumen or other synthetics. In this case, the valley is made either open or by the “undercut” method. Under the lining carpet, a valley carpet is laid on top. This carpet is coated with bituminous mastic to enhance waterproofing. The carpet is nailed with roofing nails, which are driven in at a distance of no more than 2-5 cm from the edge of the carpet and at a distance of no more than 25 cm from one another.

If the valley is laid using the undercut method, no decking is required. The valley is also required in a tiled roof. Tiled roofing is complex in design and technique, therefore it requires special attention of the builder. It is important not to allow any gaps in the thermal insulation or insufficient insulation. The valley in this case should have snow-stopping brackets. Laying the valley in a tiled roof is carried out in two ways:

• on wooden plank flooring
• on a thick wooden crate.

The width of the flooring from the board must be at least 30 cm from the axis of the groove. The laying of the groove on the flooring is done before the crate is stuffed. The grooves are built from the bottom up.

Important results

The device of the valley is a very important moment in the completion of the construction of a house, cottage or outbuilding. The fundamental thing is that its device has many technological moments that should not be missed:

• high-quality waterproofing of the lower valley to maintain the integrity of the roof and durability of operation
• compliance with the structural strength of the crate to prevent sagging or breakage of the valley

• the correct selection of materials for installing the gutter, the choice of this material, taking into account the highest possible quality and reliability, water resistance;
• installation of valley elements by specialists or amateur builders with sufficient knowledge.

If all these points are observed, you will get a roof where the valley will perform its main function - to protect against the destructive power of water and keep warmth and comfort in your home for many years without costly and troublesome unscheduled repairs.

The video will help you to carry out the correct installation of the roof valley.

All owners of country houses want their house or cottage to look unusual, surprising others not only with its appearance, but also with the internal structure of the roof.

The more complex the shape of the roof, the more unusual the whole building takes on. In this case, the valley will be a key element in the design of roofs, because the more slopes and valleys, the more complex the configuration of the entire roof is. Let's take a closer look at what a roof valley is.

valley roof

Considering such an element as a roof valley, it is worth saying that this is one of the most important elements of the entire roofing system, which is nothing more than the intersection of slopes that form a gutter. Valleys are the internal (or incoming) corners of the roof, the place where the slopes join (in the form of a tray) serves to collect water.

When designing the entire roofing system, special attention must be paid to the roof valleys, as they are most susceptible to rainfall loads.

Therefore, when connecting slopes, rather strict rules should be followed when erecting a valley roof. Materials must meet the highest quality requirements, and construction technologies must be followed very precisely.

At the same time, it does not really matter what type of roof will crown the entire building (hip, tent-shaped, or cruciform), in all these types of roofs there is such an element as a valley, and therefore special attention must be paid to their construction and design.

Even the most minimal mistakes in the design of the roof can lead to sad consequences: from ordinary leaks in the roof, to its complete collapse, if all possible loads (from wind to sedimentary) are not taken into account. Therefore, if you have doubts about your abilities and skills, it is better to invite specialists at this stage of work.

Design features of the valley and its types

Quite often, you can see that the roof valley is made of metal sheets in the form of planks.

They may have their own design features. Depending on this, two types of them are distinguished - the lower valley bar, the upper valley bar.

The lower bar and its installation are made in cases where a negative angle forms at the joints. Its main purpose is to prevent moisture from entering through the joints.

The installation of the lower bar must necessarily go even before the stage of installing materials for the roof, such as, for example, corrugated board or metal tiles.

The upper bar of the valley, for the most part, has only a decorative function. It should give the docking points of the slopes an attractive look. In other words, the installation of the valley is the final stage in the external design of the roof.

The upper bar of the valley is installed after the installation of roofing materials.

It is necessary to pay attention to the place of attachment of the valley and choose it very carefully. This will prevent damage to the bottom of the valley. For fixing, it is best to use roofing screws, and so that there are no leaks at the attachment points, it is necessary to use lining layers.

There are three main types of valley:

• open type;
• closed type;
• intertwined.

Their main differences are only in the variety of ways of connecting and weaving roof slopes.

Valley roof design

In the process of designing the entire roofing system, it must be understood that the more complex the shape and type of the roof, the more difficult it will subsequently be to erect. Accordingly, and vice versa, the fewer slopes, and, therefore, the whole structure is supposed to be simpler, the less difficulties with its construction will be.

If the roof is supposed to be multi-pitched (for example, hip) and with a large number of valleys, then there must be a plan for the future roof with the calculation of the main dimensions of the building, as well as other design features.

To properly design the roof, it is necessary, as it were, to break the building into rectangles, the largest of all will serve as the main room, and the rest, those that are smaller, will serve as extensions.

On an approximate scale and indented from the walls, you need to depict the entire perimeter of the future roof. In those places where it is supposed to connect the main premises with the annexes, there will be a valley line. Such a line will be the inner corner at which the rest of the roof elements converge.

Most often in modern houses, you can see valley roofs, which are made in the form of the letter T. In this type of roof, there are no differences between different types of rafters (diagonal and valley).

In this case, we can say the following: both the installation of valleys and all other stages of work can be done in exactly the same way as the installation of conventional rafters. But in this case, special attention should be paid to the correct connection of the slopes and their secure attachment to each other.

Groove laying

Before you start laying the groove, you need to take care of laying the wooden flooring. For this purpose, you can use a cutting board. However, it is worth remembering that it must be treated with special antiseptics.

On multi-pitched roofs, it is impossible to do without a valley, and therefore both the roof and the valley become practically the same concepts. When laying the groove, be sure to pay attention to the following features:

1. it is worth remembering that the groove is installed before the arrangement of the crate;
2. after the groove is laid, the edges of the crate must be fixed to the flooring;
3. all ends of the timber used must fit the flange of the groove;
4. in the process of laying the groove, its angle should be bent a little more than the angle of the valley itself;
5. all laying should be carried out from the eaves and in the direction from the bottom up;
6. to fix the groove to the flooring, it is necessary to use special roofing nails;
7. if it is necessary to build several grooves, then the most minimal overlap should be about 10 centimeters;
8. the ribs running across must be aligned during the laying process;
9. both edges of the groove, which provide the best water-repellent properties, must be glued with a strip of foam rubber, it will provide reliable protection for the entire valley from penetration of excess snow, dirt and water into the roofing material.

In the process of fixing the groove of the valley, you need to constantly pay attention to ensure that it does not move.

Protecting the valley from the weather

Since the valley is one of the most vulnerable elements in the entire structure of the roof, it is natural that it should be protected as best as possible from the influence of weather conditions. To achieve these goals, you can use special rolled carpets for the valley.

With a slight slope of the roof, you can get by with a coating of 4 layers. But it is necessary to connect the previous three layers together. The upper layers are fixed in one row with the canvas on the slopes.

With a slope of more than 15 degrees, all three layers are also glued to each other, but with a certain level of conjugation in the slope of the valley.

The groove, which is less than 60 centimeters wide, should be covered with long carpets, and if it is even wider, then pieces of roll coverings can be used. Laying of all layers must be carried out transversely to the entire valley.

Valley roofs are, first of all, complex types of roofs. The aesthetic appeal and beauty of both the whole house, in general, and the roof, in particular, depend on such an element as a valley.

Therefore, you need to take care that at each stage of work everything that you have in mind is done as accurately and reliably as possible, according to the developed drawings and plans. And only if all the conditions and requirements for the construction of a valley roof are met, your non-standard roof will delight you and your friends with its unique shapes and beauty for many years!

The roof valley is one of the roofing elements, which is a kind of internal corner formed at the junction of the slopes. This element is one of the main nodes of the roof in the entire system of its construction. The main purpose of the roof valley is the gathering of atmospheric precipitation. There are open, closed, and combined valleys. The installation of the valley is carried out taking into account a number of requirements, which are important to know about for any person who decides to independently carry out work on the arrangement of the roof.

The design of the roof valley should be given special attention. The comfort of the residents and the durability of the structure will depend on how the installation will be carried out, the calculation during the design and the choice of material.

Roof valley: basic concepts

Considering the main features of the corrugated roof valley, it should be noted that it is one of the most important elements of the roofing system. A valley is the intersection of two slopes that form a gutter. These elements are the incoming (or internal) corners of the corrugated roof. The junction of two slopes (in the form of a tray) is necessary to collect water.

In the process of designing a roof, special attention is paid to valleys, because they are the most exposed to precipitation loads.

Valley device: 1 - axis, 2 - self-adhesive bitumen-polymer materials, 3 - valley carpet, 4 - lining carpet.

As a rule, the nodes of the valleys are arranged along a continuous crate and on a reinforced waterproofing layer. A roofing iron substrate can also be used. When connecting roof slopes from corrugated board, it is necessary to follow clear and fairly strict rules. The materials must be of the highest quality, and all construction technologies must be followed very precisely.

At the same time, it does not matter at all what type of roof will crown the whole house (cross-shaped, in the form of a tent or hip). In each of the types of roofs there is such an obligatory element as a valley, and therefore special attention must be paid to its design and construction, including when installing a roof from a profiled sheet.

Even the smallest mistakes at the stage of designing a corrugated roof can lead to very sad consequences: from banal leaks in the roof to its complete collapse. In this case, you will not only waste your money on galvanized sheets, but you will also be forced to re-erect the entire structure. In the process of designing a valley, it is necessary to take into account all possible loads (from wind to sedimentary). Therefore, if you doubt that you can independently arrange a roof from corrugated board, taking into account all the nuances, it is better to invite qualified specialists.

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Design features of the roof valley and its types

Quite often there are valleys made of metal sheets in the form of planks. They may have their own differences and design features. Depending on this, 2 types of them are distinguished - the upper valley bar and the lower valley bar.

The lower bar is installed if a negative angle is obtained at the joints. The main purpose of this bar is to prevent moisture from entering through the joints.

The bottom bar must be installed even before the installation of the corrugated board or other selected coating. Regarding the node of the passage through the roof, remember that this place is best also outlined in advance so that in the future you do not have to dismantle the roofing.

The upper bar of the valley has, for the most part, an exclusively decorative function. Its main task is to give the docking points an aesthetically pleasing appearance. That is, the installation of the valley is the final stage of the external design of the roof.

The upper bar of the valley is installed after the corrugated board has been installed. Be sure to pay attention to the place where the roof valley is attached and choose it very carefully. So you can avoid damage to the lower part of the structure. Roofing screws are best suited for fixing. To prevent leaks at the attachment points, you need to use layers of gaskets.

There are 3 main types of valley:

• closed type;
• open type;
• intertwined.

The main differences between these types are only in the variety of ways to connect them, as well as the interweaving of roof slopes.

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In the process of designing a corrugated roof, you need to understand that the more complex the type and shape of the roof, the more difficult it will be to equip it in the future. Consequently, and vice versa, the fewer slopes at the corrugated roof, the simpler the whole structure will be, and the less difficulties will arise during its construction.

If it is planned to install a multi-pitched roof made of corrugated board with a large number of valleys, then a plan for the future roofing system is necessarily drawn up with the calculation of the most important parameters of the building and other design features.

To correctly draw up a roof project, it is necessary, as it were, to break the house into rectangles. The largest rectangle will act as the main room, while the smaller rectangles will serve as extensions.

On an approximate scale, taking into account the indentation from the walls, it is necessary to depict the entire perimeter of the future roofing from corrugated board. In the places of the proposed connections of the main premises with the annexes, the valley line will pass. This line will be the internal corner at which other roof elements converge.

Prepare the tools needed to set up the valley and perform related operations:

Tools for mounting the valley: 1 - screwdriver, 2 - hammer, 3 - mallet, 4 - brush, 5 - tape measure; 6 - long rail, 7 - marker, 8 - level, 9 - metal scissors, 10 - round nose pliers.

• screwdriver;
• self-tapping screws;
• metal cutting tool;
• riveting machine;
• steel rivets;
• a hammer;
• ruler;
• nails;
• level;
• simple pencil.

As a rule, during the construction of modern houses, valley roofs are made in the shape of the letter T. In this type of roof, there are no differences between different types of rafters (valley and diagonal). In this case, the following can be recommended: both the installation of valleys and other stages of work can be performed in the same way as the installation of ordinary rafters. However, in this case, special attention is paid to the correct connection of the slopes and their most reliable attachment to each other.

The design of the roof plays a very important role in creating the appearance of the house. The fantasy of architects sometimes simply boggles the imagination with the intricate shapes of the roofs of individual residential buildings. Many planes of colored corrugated board intersecting at different angles look unusual and original.

But the complexity of the roof has a downside. When choosing a roof structure, you must always remember that its main task is to protect the building from rain and snow. At the same time, any joint between the roof slopes carries a potential danger of a violation of the tightness of the roofing and the occurrence of a leak.

One of the most critical places in roofs of complex shape is the inner corner at the intersection of two slopes. This element of roofing is called a valley. It is the valley for corrugated board that receives precipitation from the planes of intersecting slopes. During rain, a stream of water collected from a large area flows down the valley, and in winter snow always accumulates in it, increasing the load on the truss system.

Therefore, you need to know how to make a valley correctly and pay special attention to the design of this roofing assembly.

The device of the roof valley from corrugated board

As mentioned above, the valley is the junction of two roof slopes, forming a gutter. The valley for corrugated board can be of three main types:

• open;
• closed;
• interlaced (combined).

In an open valley, the lower parts of the roofing of the slopes end with a special gutter, the role of which is played by the lower plank of the valley on the corrugated board. It is she who serves to divert water into the gutter.

After installing the corrugated board on the roof slopes, the top bar of the valley is installed at the place of their junction. This element performs a more decorative function, covering the edges of the roofing. The figure shows a corrugated valley device.

A closed valley for corrugated board differs from an open one in that in it the sheets of roofing at the junction are fitted close to each other. In this case, the upper bar of the valley is not installed.

The interlaced roof valley construction is even more complex. In this design, roofing sheets at the junction are wound on top of each other in a checkerboard pattern.

For corrugated roofs, an open valley roof is most often used.

The device of the truss system with a valley

Considering the increased load on the roof at the location of the valley, special attention should be paid to the reliability of the truss system at the inner junction of the slopes. The roof truss system with a valley is quite complex. It is better to entrust the development of drawings of the frame of such a roof to specialists, but there are a few basic rules, under which a roof with a valley can be built with your own hands.

Before starting the construction of a multi-pitched roof with several valleys, you must first draw up a plan for the truss system. To understand how to properly lay a valley, you need to conditionally divide the house into several rectangles. The largest of them is considered the main one, and the roof frame of smaller rectangles will join its truss system.

At the junction of the main premises with the annexes, the lines of the valleys will begin. At the points of support of the valley rafters, additional crossbars are mounted, which, in turn, rest on racks or struts. The diagonal truss legs of the hip roof are installed in approximately the same way. The most difficult is the device of the rafters of the mansard roof valley.

Rafters under the valley are mounted in the same way as any other rafters of a pitched roof. The main thing, before making a valley, is to correctly connect the slopes and securely fasten them together.

If for corrugated board with a small profile height on the roof slopes it is quite enough to perform a crate with a step of 300 mm, then the crate under the valley must be solid.

How to install a roof valley from corrugated board?

When the assembly of the truss system is completed and the reliability of fastening of all its elements to each other is checked, the valley is mounted with its own hands without much difficulty.

First, at the installation site of the valley, additional bars are installed in order to make the crate solid. Before laying the valley, additional waterproofing must be performed in this place.

A waterproofing tape is laid over the roofing membrane in the valley, which should be 5-10 cm wider than the bottom plank of the valley. Sometimes special self-adhesive waterproofing tapes are used, but most often they are simply nailed to a continuous roof sheathing.

How to properly make a corrugated roofing valley completely sealed:

1. Waterproofing membrane; 2. Adhesive sealant; 3. Self-adhesive fixing tape
4. Plank of the valley; 5. Sheet of corrugated board.

After laying additional waterproofing, at the junction of the roof slopes, the bottom bar of the valley is mounted. When the angle of the roof slope from corrugated board is small, it is better to use an enlarged bar. If the usual valley plank has a width of each side of the order of 300 mm, then it is increased by 2 times.

One of the most significant parts of the roof, but which is not always paid due attention during construction, is the valley. From a technical point of view, this is an angle (internal or external) that is formed at the junctions of two slopes. In fact, this is a water collection tray, which, during precipitation, is under the greatest load relative to other parts of the roof. In order for the valley to serve for a long time, and the roof does not leak, the installation of the roof valley from metal tiles must be done as correctly as possible, and special attention should be paid to the installation of this part.

What you need before starting the installation of the valley

If everything is done on time, all the technological processes for installing the roof are carried out in order, then there should be no difficulties with quality.

Naturally, at first it is worth doing, purchasing it, as well as all the necessary related materials and preparing all the necessary tools.

Mounting materials

The roof needs to be covered quickly. The option when they prepared the base, and six months later they made a roofing carpet, and after a couple of months they took up the valley and all the planks should not even be considered.

Therefore, you need to be prepared for the fact that you will have to buy the following immediately (well, or, almost immediately):

• Actually metal tile
• Planks: roofing, end, ridge
• Sealing washers, self-tapping screws
• Guide board
• Edged board
• Waterproofing
• Decorative items (these are usually bought last)

When buying materials, you need to immediately take care of purchasing tools.

Tools for mounting the valley

For the installation of the valley, you will definitely need:

• Scissors that can cut metal. They can be conventional metal or electric.
• A battery-powered screwdriver (it is at least inconvenient to carry a power cord, carrying, adapters on the roof)
• Drill
• Medium size hammer
• Measuring tool (tape measure, maybe even a carpenter's ruler)
• Chalk or something to mark
• Ladder
• Safety ropes (ropes)
• Gloves and, preferably, goggles (the latter will be needed when cutting metal with electric scissors)

If everything is prepared, there is a desire, the weather allows, you need to start installation.

Installation of a valley under a metal tile

Initially, waterproofing is performed, then guides are laid, after which a roofing carpet is made of metal tiles, and finally it is worth doing the valley. This is a variant of the lower valley device.

There may be such a variant of the device of the roof valley from metal tiles:

1. Installing guides
2. endova
3. metal tile

In general, an endova can be:

• bound
• Closed
• open

Even in appearance, the valleys, open and closed, differ.

Naturally, with the commonality of installation for all these elements, there are significant differences in the work. But under each valley, another plank must be attached. After that, the sequence of work will be as follows:

1. Installation of valley strips. They are fastened from the bottom up with an overlap of 25 - 30 centimeters
2. The trim should be below the valley plank and below the eaves line. Flanging performance
3. Sealant installation. It is made under the ridge and flanging

It is important! Between the valley line and the sheet of metal, on each of the contacting sides, you need to leave a gap of 6 - 10 centimeters. If it is necessary to cut the sheet, self-tapping screws are screwed into it at the joints, the distance between them should be from 10 to 15 millimeters.

This part of the roof installation is a kind of verification of the correctness of the entire structure. If everything is done as it should, then at the attachment points the sheet will touch the valley board, which completely eliminates the possibility of water leaking under the valley. After all the work, you can and should proceed to attaching decorative overlays.

Installation of a twisted valley

The twisted valley is the most difficult. It is necessary to foresee in advance where part of it will be under the roof. Complete this part of the work. Then immediately lay the metal tile, and then continue laying the upper part of the valley on top of it.

Laying the valley of metal tiles in this way is used where the roofs have an even slope of the slopes. Compaction can only be achieved when the width of the valley carpet is about 90 centimeters.

A waterproofing membrane will need to be laid. It should be fixed on moisture-resistant sheets of any chipboard wood with nails.

When it is necessary to interlace ridge joints, the interlaced valley must be completely covered with roofing material. The joints should be fixed with sealant or bituminous mastic.

Builders also like to share the installation of the valley at the location on the roof.

Endova, the beginning and end of which is on a slope with a dormer window

After checking the waterproofing layer of the roofing carpet and installing additional boards between the stepping boards of the crate, you need to bring a sheet of metal tiles to the edge of the slope.

1. You need to cut a sheet of metal. The cut must be at least 20 centimeters higher than the valley on the slope
2. Cover the dormer window with sheets of metal
3. Lay sealant along the walls of the dormer window
4. On the cornice overhang of the window you need to attach the cornice strip
5. Lay the valley and cut it as accurately as possible along the exit line to the slopes and along the cornices
6. Join the sheets of the right and left valleys in the upper part. You have to cut them at an angle.

All parts of the valley must be fixed with self-tapping screws. Seal joints with sealant. In the installation of the valley, the main thing is to cut all the joints under the roof elements evenly and beautifully. If this is done sloppily, then the whole roof will have the same sloppy look.

In addition to the valley, you need to install other elements of the roof. The right one will provide excellent roof ventilation. And also this element performs a decorative function. In stores you can find a skate, for example, with figurines of birds.

Another important element of the roof is the eaves. We recommend that you familiarize yourself with the installation of the cornice strip for metal tiles. It will protect against moisture leakage, from snow getting under the roof, and will also give a finished look to the roof.

Some secrets of a beautiful valley installation

For the lower valley, the main density is the fit to the base of the roof. If the valley is screwed tightly and the joints are foamed, then the installation of the metal tile is simple. And the quality of the roof in these places should be worthy.

From the upper valley, not only strength is required, but also beauty. Therefore, everything must be cut very evenly, without scratching the metal.

If it is necessary to lengthen the valley, it is necessary to perform an upper overlap of 20 centimeters. Fix the joint with self-tapping screws and sealant or bituminous mastic.

You can hide the flaws of the upper valley, as well as on top of the roofing carpet with the lower valley, by installing a false valley. It must be fixed every 30 centimeters.

All self-tapping screws that secure the valley must be screwed into the crest of the wave of the metal tile.

Usually the valley is purchased in the same color as the entire metal tile. Its correct arrangement will not only give a finished look to the entire roof, but will also protect it from water leakage on the slopes. Installation of the valley must be carried out together with all the work. It is absolutely unacceptable to engage in its fastening after several months of operation of the roof.

Video about the installation of metal roofing valleys

Internal valley for metal tiles.

Instructions for installing the valley on the roof slope.