Valley metal roofing installation. Roof with valley rafter system. How to install a valley on a corrugated roof

At first glance, installing a valley roof seems to be a rather complex and problematic process. Therefore, many consumers prefer to pay builders rather than do this work themselves. In the article we will further describe in more detail what a valley is, and also provide detailed instructions by its construction.

Purpose of the groove

On roofs with complex configurations that include several slopes at once, internal joints inevitably occur. Snowfall, rainwater, and all kinds of debris most often accumulate in such places. In addition, they are quite difficult to maintain.

The valley, or valley, is an element that is laid along the inner corner of the roof under the slopes. It is designed to protect the structure from water flowing under the roofing and ensures free evacuation of precipitation from the roof surface.

The number of valleys will depend on the following factors:

The roof configuration is cruciform, in the shape of the letter T or G.
The presence of additional elements, in particular, attic and dormer windows.

Structure of the internal valley

As a rule, the construction of a valley made of corrugated sheets involves the presence of two planks, which are bent at an angle coinciding with the angle formed by the adjacent slopes. In this case, the lower element serves as a drain, and the upper one is rather decorative.

In some cases, the top piece of the valley is not installed. It depends on the type roofing covering, as well as roof features. Be that as it may, proper execution of the valley connection ensures the reliability and waterproofing of the roof structure.

There are some standards for arranging a valley:

The lower element of the valley is laid before fastening roofing material, and the top one - upon its completion.
Nails are not used to install the valley.
The gutter is assembled from the bottom up, sealing the seams with Tegola brand bitumen-polymer mastic, sealants based on bitumen (Xtra Seal) or rubber (Tytan), or Icopal glue.
The internal valley for corrugated sheeting is made of galvanized steel or copper, and the external valley is made of roofing material. It is preferable to use a galvanized sheet with polymer coating, such a valley strip can withstand temperature changes from -60 ℃ to 120 ℃.
To provide additional insulation of the roof and prevent water from flowing under the roofing material, a foam rubber seal is glued along the ribs of the valley.
You can fix the groove either using clamps on the sides, or using self-tapping screws along the edges.
The sides are made at least 2 cm in height so that water does not overflow over them during heavy rain.
The valley flange is in contact with the end parts of the sheathing slats.
In cases where the valley for corrugated sheeting is assembled from several sections, they are laid with an overlap of 10 cm.
On roofs with flat slopes, enhanced waterproofing is required.

Types of grooves and their connections

There are several types of roof valleys made from corrugated sheets based on the configuration of the joints between the slopes:

Open valley - found on low-slope roofs. In this case, additional waterproofing is necessary.
The closed type of valley is characteristic of roofs in which steep slopes practically touch, overlapping the gutter.
An intertwined valley is shaped like a closed valley, however, at the joints the fragments of the roofing intersect, forming a single surface.

Let's consider the features of each type of valley.

An open valley has the following advantages:

No debris accumulates on it.
Sediment is quickly evacuated from the surface.
Installation work is quick and easy.

If we talk about the shortcomings, then such a valley does not look very beautiful.

Among the advantages of closed or interlaced grooves are:

Aesthetics.
High-quality waterproofing.

But this design has significantly more disadvantages:

The intertwined valley is quite difficult to install.
The process takes much longer.
This roof needs regular cleaning of debris.
During thaws, ice plugs may appear between the gutter slats.

Schemes and types of lathing for the rafter system

Depending on the intended roofing material and the design of the rafter system, the construction of the valley will be carried out differently. In this case, we mean the type of sheathing. Recommendations in this regard are usually indicated by manufacturers in the instructions for roofing coverings.

The lathing for laying the valley can be of the following types:

Continuous sheathing is performed for subsequent laying of soft roofing. In this case, the valley roofing carpet is made of waterproofing material. This installation method is the simplest.
Gable roof with a valley in which slate, corrugated sheeting or tiles are used as roofing, the sheathing for the gutter is made of 2-3 boards 10 cm wide, laying them along the joints. The wider the valley is supposed to be, the larger the pitch of the sheathing will be.
To lay metal tiles between the main slats, auxiliary battens are installed. Otherwise it won't cause any difficulties.
Ondulin is laid on two 10 cm wide boards in 15 cm increments, so the groove will not sag.

Installation features for corrugated sheeting and other roofing materials

As already mentioned, a house with a valley roof is subject to loads from rain and snow, which must be removed from its surface in a timely manner. In this regard, the provision of high-quality waterproofing is a primary task. Therefore, when installing a gutter, you should pay attention to such subtleties as: correct cutting of the roofing material, maintaining the spacing between the supporting elements and fasteners, tightness of the seams, and the size of the overlaps. Only the technology for installing a valley made of soft roofing, which is placed on a continuous base, will be somewhat different.

Installation under soft roof done like this:

Placed on a continuous sheathing over the entire surface of the roof slopes underlay carpet. At the joints of individual sheets it is laid with an overlap.
A valley carpet is laid along the inner corner of the roof. Its edges are fixed with bitumen mastic and then nailed every 10-20 cm. About 20 cm of carpet should peek out from under the roofing material.
If the length of the valley exceeds 10 m, it is made of several parts, secured in an overlap of 15 cm. The edges of the planks are secured with mastic.

The technology for installing a valley under corrugated sheets, ceramic or metal tiles is as follows:

A layer of waterproofing is laid on top of the base, which is nailed every 20 cm.
Next, lay the lower element of the valley with a slight overlap of the cornice board, fixing it with self-tapping screws every 30 cm.
Sealing strips are placed along the edges of the bottom gutter strips.
The roofing material is cut along the groove and secured so that it does not reach the bend by 10 cm.
The upper element of the valley is mounted with an overlap of 10-12 cm.

To mark the cutting line, you can use paint cord from KARPO, Irwin, INTERPOOL MT-2507 or STAYER brands.

Installation of a groove for ondulin:

Separate pieces of material for the valley are attached with an overlap of 15 cm using self-tapping screws in the upper corners of each fragment.
The edges of the groove are sealed with sealing tape.
The roofing covering along the corner element is trimmed and then nailed into each wave as far as possible from the middle of the gutter.

Features of the valley design near the roof windows

Roof structures such as an attic door or skylights, also needs to be waterproofed. The construction of a valley in such places involves placing its lower element on the correct covering.

The work flow looks like this:

The sheathing is installed near the attic window.
Calculate the length of the groove, taking into account possible overlaps if it consists of several fragments.
Mark the bend at the bottom of the gutter.
Bend the incised areas in the direction opposite to the sides.
The valley is slightly raised above the roof level by placing bars under it.
The edges are sealed with tape.
The lower section of the roofing covering is trimmed and slipped under the valley strips.

Thus, the valley is an extremely important and required element roofs, which you can arrange with your own hands. It is only important to arm yourself with some knowledge and tools.

The valley on metal tiles, as practice shows, is one of the “weakest” and most dangerous places for leaks. You can’t save on valley floors. Roofs with leaking valleys can be found quite often - alas, this is not uncommon.

Installation of the valley is carried out according to the following rules.

Construction of a valley starting under the eaves line and ending at the ridge line

The valley must be installed according to the following rules:

1. Firstly:

Make sure that the waterproofing along the valley is installed correctly, that there are gaps for water and small debris along the valley counter-batten, and that there are no tears or mechanical damage to the waterproofing.

2. Secondly:

Be sure to strengthen the valley with additional sheathing by adding an additional board between the boards of the step sheathing (as in the top picture).

3. The valley strips are mounted on already installed drip edges (when the valley begins on the eaves).

4. Prepare the required number of valley strips and install them from bottom to top with an overlap of 25 - 30 cm. Cut the bottom valley strip just below the eaves line and make a flange on it along the eaves line.

5. Install a universal seal along the flanges of the valley strips and under the ridge.

Cut the sheets of metal tiles bordering the valley according to the markings. The sheets should not reach the center line of the valley 6 - 10 cm on each side.

6. For fastening, use the same screws as for fastening metal tiles. When fastening cut sheets, it is allowed to screw self-tapping screws into standard places located 10 - 15 mm below the stamping line at the bottom of the wave through a sheet of metal tiles and through the valley strip no closer than 25 cm from the valley axis.

In these places, the sheets of metal tiles touch the plane on which the valley strips lie. In this case, the self-tapping screws that pass through the sheet of metal tile and through the valley strip will tightly press the sheet of tile to the valley strip at the points of fastening with self-tapping screws. If there is a deviation from the standard places at the fastening points, a gap will remain between the sheet of metal tile and the valley strip, which can lead to leaks through the valley strip at the points where the screws pass through it.

7. It is not allowed to tighten screws at a distance of less than 25 cm from the valley axis.

8. During installation, all cuts are carefully aligned to the base using a rubber mallet.

9. Installation of the valley casing (decorative trim):

Mount the overlay, moving from bottom to top, overlapping (overlapping) each other by at least 10 cm. Fasten the decorative overlays of the valley to the top points of the metal tile sheets adjacent to it.

It is prohibited to install a seal between sheets of metal tiles and the valley lining.

* The valley overlay hides the oblique cuts of the metal tiles and reduces the likelihood of snow blowing between the sheets of metal tiles and the valley strip. Water collected from the slopes falls under the valley overlay and flows along the center line of the valley fold.

Construction of a valley starting at the slope and ending at the slope

1. Make sure that the waterproofing along the valley is installed correctly, that there are gaps for water and small debris along the valley counter beam, and that there are no tears or mechanical damage to the waterproofing.

2. Be sure to install an additional board in the valley between the boards of the step sheathing. Apply a sheet of shingles to the side wall of the dormer window as follows:

cut the sheet of metal tile adjacent to the side wall of the dormer window to length so that the line of your cut is at least 20 cm above the exit of the valley to the slope (the remaining part of the sheet of metal tile can be used to continue installation by adding a single-module sheet with in order to reach a common line of joining sheets in rows);
To attach the sheet to the side and front walls of the dormer window, make cutouts to fit the size of the dormer window and mount a sheet of metal tiles.

Mount a universal seal on a sheet of tile along the walls of the dormer window.

Install a cornice strip on the eaves overhang of the dormer window.

Install pre-prepared valley strips in the valley. Trim the bottom of the valley strip along the eaves and along the exit line to the slope. If necessary, use a rubber mallet to shape the edge of the valley facing the slope in order to ensure a tight fit of the valley strip onto the sheet of metal tile. It is allowed to slightly straighten the bottom sheet of metal tiles.

When extending the valley, provide an overlap of 20-30 cm, depending on the angle of inclination of the slopes.

In the upper part, join the sheets of the left and right valley using tinsmith techniques or using self-tapping screws using sealant. From correctness preparatory work In this place, the protection of the ridge line of the dormer window from water entering it from the upper slope depends.

Install a universal seal along the valley flanges.

Get ready to install sheets of metal tiles with bevel cuts on a large slope.

If you are using the part remaining from the side sheet of the tile, bring the bottom cut on it to the standard appearance and add a single-module sheet to it in order to bring the level of the top of the sheet to the common joining line along the rows on the slope.

Prepare the first sheet of the main slope above the valley for installation. Its lower part must be below the line where the valley exits the slope. Place the prepared sheet on the metal tile sheet previously installed below the valley, with the overlap of the sheets being at least 20 cm, and the valley sheet itself will be sandwiched between the sheet being mounted and the previously installed sheets. Mount all sheets bordering the valley.

Make sure that the gaps between the cut sheets and the center line of the valley are 6-10 cm.

When fastening cut sheets, it is allowed to screw the screws into standard places located 10-15 mm below the stamping line at the bottom of the wave through the sheet of tile and through the valley strip no closer than 25 cm from the valley axis.

If there is a deviation from the standard places at the attachment points, a gap will remain between the metal tile sheet and the valley strip, which can lead to leaks through the valley strip at the points where the screws pass through it. It is not allowed to tighten screws at a distance of less than 25 cm from the valley axis.

Mount the cash overlay, moving from bottom to top with an overlap of at least 10 cm.

It is prohibited to install a seal between sheets of metal tiles and the valley lining.

Attach the valley lining to the top points of the adjacent sheets of metal tiles.

Make sure that the screws securing the valley trim do not damage the previously installed valley strips.

The valley overlay decorates oblique cuts on the metal tiles and reduces the likelihood of snow blowing between the sheets of metal tiles and the valley. Water collected from the slopes falls under the valley overlay and flows along the valley fold line.

*** Operation and care of valleys for metal tiles.

Valley roofs on metal tiles require care. Last year's leaves that fell on the roof also fall under the valley trim and, if there is a sufficient gap between the cut edges of the metal tiles, they will be washed away with water along the valley strips.

If there are trees near the house, remove the valley covers from time to time and clean the water channel. Leaves, pine needles and other debris “stay” in the valleys, clogging the water flow and causing rotting of the metal.

The roof is one of the most important functional elements of any house or building, so the issue of roofing must be approached with special care and utmost care. The roof is considered one of the most complex structural elements; its installation requires careful calculations by a knowledgeable specialist and high-quality materials. Leading architects and designers of our country claim that one of the most reliable and modern species roofs are considered rafter system roofs with valley.

The roof truss system with a valley is considered the most reliable today.

The roof truss system with a valley not only solves all functional problems, but also gives the facade of the house a special and unique design look. Despite the fact that the valley is practically invisible, its uneven appearance, bumps or noticeable rust can spoil the top view of the facade, but with the help of the valley you can also emphasize any elements of the designer roof.

The valley is the place where two roof slopes meet, resulting in an internal corner. The roof valley is necessary for the convergence of precipitation and its uniform flow. Its mandatory use is required in buildings that are built in a T or L shape or in places where roof slopes are pronounced. Typically valleys are made from metal sheets. Experts recommend galvanized steel for the roof valley; it can be used to extend the life of the roof.

The corner design has two strips that have important functional solutions:

The lower valley is placed at the joints and forms negative angles; it serves as a fence and protection against the penetration of precipitation inside.
The upper valley carries out an artistic and aesthetic function.

Main types of valley

There are three main types of valley: open, closed and interlocking. They differ in the connection of panels roof slopes.

The design of the open valley is that all the panels of the roof slopes are combined end-to-end, they are used to eliminate precipitation. To install an open valley, it is necessary to lay a strip of corrugated roll roofing, its width should be at least 46 cm. We hold the valley carpet firmly and nail it with nails at intervals of 2.5 cm. The strips are applied on both sides with grade 400 cement, the thickness of the cement should be about 1.5 mm. Then a strip of rolled roofing is laid over the previous one and then secured with cement.
In the case of steep roof slopes, closed valleys are used; they serve for uniform rainfall drainage. In the second case, just like in the first, we lay out a corrugated tape 90 cm wide. The tiles are installed along the slope.
The essence of an interlocking valley is that all the panels of the roof slopes interlock with each other. The woven valley is covered with roofing material. Some lines of tiles intertwine with each other and are installed across the valley.

Advantages of a valley

In order to install a valley, it does not require much time and effort, especially if these are simple roof structures.
The design has increased safety during heavy rains or snowfalls.
Snow does not turn into ice; together with rain, it pours from the roofs in a uniform stream.
Valley roofs are durable.
These designs add some aesthetics.

Installation features

In order to install a roof with a valley, you will need the following materials:

brackets to secure the groove;
waterproofing self-adhesive strip with a foam backing to protect against moisture, dirt and precipitation;
half tiles;
special tape for joints.

When laying a roof with a valley, a special tape is used for joints.

To install the valley, battens must be installed. The sheathing should be frontal on both sides of the roofing planes. The entire length of the wooden gutter must be laid waterproofing material, this is necessary to prevent moisture penetration. In many cases, when the slope is flat, an auxiliary waterproofing layer is laid; if additional waterproofing is neglected, the unit may fail prematurely, and this is additional expense, since the unit and the roof itself need to be repaired again.

A valley carpet can serve as an excellent waterproofing material; it is completely saturated with high-quality bitumen. Top part of this material is made of basalt topping, and the bottom one is sand. Most often, the valley carpet is nailed down every 20 cm. But you can also glue it with stickers. This waterproofing material is of high quality and will serve you well. long years. After the waterproofing layer, the lower part of the valley is installed, it is called the false valley.

The false surface is a spacious plate that is lowered at an angle (the angles are formed when the slopes are connected). Using self-tapping screws, the plate is attached to the sheathing every 30 cm. The valley, consisting of several components, is folded from below, therefore, the edge of the upper part of the plank should cover the edge of the bottom by 15-20 cm. It is advisable to treat the joints with sealant - this, in turn, will increase waterproofing . For correct installation, it is necessary to lay the roofing material above the axis of the inner corner on both sides by 8 -10 cm. The upper part is mounted in the same way as the lower one, it must be laid with an overlap of 10 - 12 cm. A roof with a valley must be carefully designed so that avoid leakage during precipitation or even its complete collapse.

Roof truss system with valley

The roof rafter system is considered one of the highest quality and durable due to its extended design, which combines different arrangements of rafters, such as hanging and layered. At the planning stage, a clear plan is carried out, where all connections are indicated, including the veranda, terrace, dormer and attic windows. Valley roofs branch into T-shaped, L-shaped and cross-shaped roofs. It is believed that the more difficult the roof is to construct, the significantly more time and money is required for its installation. The main and additional purlins should be visible on the plan; the weaves that form the valley will immediately appear; this is where the diagonal rafters are installed.

The most difficult moment when assembling the frame of a roof truss system is the valley. Typically, the valley is formed by a rafter frame that lies on the sheathing; it is based on the upper part of the joints of the ridge beams and the purlin. In order to avoid damage to the lower valley, during the installation process you need to carefully select places for fastenings. Roofing screws work well as fastenings.

To avoid leaks at installation joints, you can use special backing layers.

When installing valleys, several very important rules must be observed:

First you need to make sure that the sealing tape for the joint is installed correctly. This is necessary in order to avoid various types of debris and water getting there.
It is necessary to supplement the installation of the valley with lathing.
The construction of valley strips is based on droppers, and the valley itself starts from the cornice.
You need to prepare a sufficient number of planks for the valley. The planks are installed from bottom to top with an overlap.
In order for the bottom strip to be below the eaves line, it must be trimmed.
When installing the valley, the installation of the planks should be done along the flanges.
The roofing material that borders the valley is cut only according to the markings.
It is necessary to mark in advance the places where the fastenings will be located so as not to spoil the material.
The specified structure is fastened with self-tapping screws.
After fastening with self-tapping screws, the roofing surface should be closely adjacent to the valley strip.
Under no circumstances should self-tapping screws be attached at a distance less than 25 cm from the valley axis.
In order to align the cuts, a rubber mallet is used during the installation process.
The upper part of the valley is installed with an overlap of 10 cm.

The design of the roof truss system frame ends with the installation of rafters, followed by the installation of the roof. Only after all these developments can you proceed to the installation of doors, windows, etc.

Some features of the roof truss system with a valley

The rafter system of the valley roof can be anything, but you must take into account the slope of the roof sheets.
For a high-quality roof installation, you need to clearly know and clearly see what kind of roof structure will be needed for a given building.
You need to choose carefully building material. Roofs require high-quality material that can withstand hail impacts, vibrations of snow and rain, it must be durable and have anti-corrosion properties.
The work should proceed from the ridge. This way you can measure the distance you need and support the roof.
After finishing the work, you need to strengthen the disconnected sections of the ridge.
To correctly calculate the load, you need to contact specialists who will not only help you calculate correctly, but also tell you where to start installing the valley.
The roof truss system must be installed in accordance with the rules of SNIPs and made of high-quality materials. The roof truss system is one of the most important structures of any building. To install a rafter system with a valley, you need good experts; without special construction skills, it is almost impossible to install the valley yourself correctly.
After the roof truss system with a valley has been installed, it is imperative to install a snow holder. The snow holder must be installed correctly, otherwise it will be of no use. It should be secured with self-tapping screws. It is advisable to select the color depending on the material you choose for the roof.

Today, almost no house is built without a roof with a valley, especially in the northern part of the earth’s hemisphere. This is due to numerous precipitation. After all, in order to protect your home from leaks and draft penetration, a high-quality valley must be made.

One of the most significant parts 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 not to leak, the installation of a valley roof made of metal tiles must be done as correctly as possible; special attention should be paid to the installation of this part.

What you need before you start installing the valley

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

Naturally, first you should do it, purchase it, as well as all the necessary accompanying materials and prepare all the necessary tools.

Installation materials

The roof needs to be covered quickly. The option when they prepared the base, and six months later they made the roofing carpet, and after another couple of months they worked on the valley and all the strips should not even be considered.

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

Actually metal tiles
Planks: roofing, end, ridge
Sealing washers, screws
Guide board
Edged board
Waterproofing
Decorative elements (they can generally be bought last)

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

Tools for valley installation

To install the valley you will definitely need:

Scissors that can be used to cut metal. They can be conventional metal or electric
A battery-powered screwdriver (carrying a power cord, carriers, or adapters across the roof is inconvenient, to say the least)
Drill
Medium hammer
Tool for taking measurements (tape tape, perhaps even a carpenter's ruler)
Chalk or something to mark with
Ladder
Safety cables (ropes)
Gloves and, preferably, glasses (the latter will be needed when cutting metal with electric scissors)

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

Installing a valley under metal tiles

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

There may be such an option for constructing a valley roof made of metal tiles:

Installation of guides
Endova
Metal tiles

In general, the valley can be:

Intertwined
Closed
Open

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

Types of valleys: open, closed, intertwined

Naturally, while the installation for all these elements is common, there are significant differences in the work. But under each valley another board must be attached. After which the sequence of work will be as follows:

Installation of valley strips. They are attached from bottom to top with an overlap of 25 - 30 centimeters
The trim should be below the valley strip and below the eaves line. Performing flanging
Installation of seal. It is done under the ridge and flanges

It is important! Between the valley line and the sheet of metal tile, 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 needed, 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 begin attaching the decorative overlays.

Installation of interlaced valley

The intertwined 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 tiles, and then continue laying the upper part of the valley on top of it.

Interlaced valley arrangement

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

A waterproofing membrane will need to be installed. It should be secured to moisture-resistant sheets of any particle board with nails.

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

Builders also like to separate the installation of the valley according to its location on the roof.

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

After checking the waterproofing layer of the roofing carpet and installing additional boards between the step boards of the sheathing, you need to bring the metal tile sheet to the edge of the slope.

It is necessary to cut the metal tile sheet. The cut should be at least 20 centimeters above the valley on the slope
Cover the dormer window with sheets of metal tiles
Lay a seal along the walls of the dormer window
You need to attach a cornice strip to the eaves overhang of the window.
Lay the valley and cut it as accurately as possible along the line of exit to the slopes and along the eaves
Join the sheets of the right and left valleys at the top. You'll have to cut them at an angle

All parts of the valley must be secured with self-tapping screws. Foam the joints with sealant. When installing a valley, the main thing is to cut all the joints for the roof elements evenly and beautifully. If this is done sloppily, then the entire roof will have the same sloppy appearance.

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

Another important element roofing - cornice strip. We recommend that you familiarize yourself with the installation cornice strip for metal tiles. It will protect against moisture seepage and snow getting under the roof, and will also give the roof a finished look.

Some secrets of a beautiful valley installation

For the lower valley, the main thing is the tight fit to the base of the roof. If the valley is screwed tightly and the joints are foamed, then installing the metal tiles is easy. And the quality of the roofing in these places should be decent.

The upper valley requires not only strength, but also beauty. Therefore, everything needs to be cut very evenly, without scratching the metal.

If it is necessary to lengthen the valley, you need to overlap the top by 20 centimeters. Secure the joint with self-tapping screws and sealant or bitumen mastic.

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

All 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 installation 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 along with all work. It is absolutely unacceptable to fix it after several months of roof operation.

Video about installing valley metal tiles

Internal valley for metal tiles.

Instructions for installing a valley on a roof slope.

Increasingly, the roof has more than just a functional purpose. Often this element is the highlight of the building. Such roofs have many planes that connect at different angles. Some connections - with positive angles - are designed in the form of a ridge, some - with negative angles - in the form of valleys. To ensure that the attic is always dry, the roof valley must be done correctly.

Valley roofs

On roofs of complex shapes, when protruding dormer windows are installed, sharp corners are formed. They are obtained at the junction of two slopes. The junction is called the valley, and the roofs are called valleys.

Roofs of complex shapes look very decorative and are a decoration of the building, but their design and installation is not an easy task - connecting planes is not easy. Because of design features These areas of the roof bear a heavy load: there is always a lot of snow and water. Therefore, the sheathing is made reinforced, and waterproofing measures are much more serious than on the rest of the surface.

Features of rafter systems

Rafters from different slopes in the valley can be connected at different angles (depending on the shape of the roof). At the junction, a rafter leg is installed, to which the rafters from the slopes are attached. For a short length (up to 2 m), it is enough to fasten them on nails (2 on each side); for a significant length, the joints are reinforced with metal plates.

Rafter connection

In places of greatest load (in the widest place), the valley rafter leg is supported from below by a jib.

Lathing

At the junction of two roof slopes, reinforced sheathing is required, and its design depends on the type of roofing material:

We have provided typical requirements and sizes, but some manufacturers may have specific requirements. When purchasing roofing material, you will be given instructions that will describe the entire installation process and requirements for the sheathing, etc. technical points. It is clear that you must adhere to their recommendations.

Valley device

There is no particular point in talking about the device in general, since each roofing material has its own characteristics. Therefore, we will consider the most popular ones separately.

On a metal roof

As already mentioned, lathing is done twice as often under the metal tiles at the junction of the slopes. The bottom plank of the valley is laid on this sheathing - this is a galvanized sheet with a fold line in the center and sides along the edges. This element belongs to the accessories and is painted to match the base material. It comes in two-meter pieces.

Metal roof valley

Installation of the valley strip begins from the bottom. The edge of the element extends slightly beyond the roof overhang, is cut 20-30 mm below the overhang, and a flange (side) is formed from this “remainder”. Please note that the valley strip should end behind the overhang; if there is a drain gutter, then above it. If it is made shorter than the overhang, then water will flow into the roof.

The next sheet is laid on top, with an overlap of 20-30 cm, the joint is coated with sealant (you can coat the entire overlap with bitumen mastic). Lay as many sheets as necessary, cut them off near the ridge and secure them.

There are two ways to attach the valley sheet

When constructing a valley, the main task is to ensure tightness. From this point of view, the second fastening option is more correct - it leaves no holes, even if they are covered with a rubber gasket.

One more thing. The bottom bar should have sides on both sides, preferably more than 2 cm in height. They are needed so that water flowing from the slope cannot get under the metal tiles.

A sealing tape is glued to the fixed strip, at a distance of about 20 cm from the bend. It comes with self-adhesive tape. Removed before installation protective covering and the tape is pasted. Next, metal tiles are laid, which are cut so that the center of the valley is 60-100 mm. Manufacturers do not recommend placing the cuts closer to the center.

The sheets are attached to the sheathing in the regular places - in the lower part of the oxen 20-30 mm below the step. The distance from the fastener to the bend is at least 250 mm.

After fixing the metal tiles, the roof valley is ready and can remain in this form. But appearance Not everyone is happy with cut sheets. In order to close them there is a decorative overlay, which is called the upper valley. It performs a decorative function - it covers the cuts; quite often it is simply not used.

See the following video for details of the valley exit above the dormer window.

Made from corrugated sheets and slate

Under these materials, several boards are laid lengthwise in the valley. A strip of waterproofing is fixed to them, which is then connected to a waterproofing membrane fixed to the slopes. The overlap should be at least 10-15 cm, the joints are connected using double-sided tape.

In this case, the sealing tape can be supplemented with sealant. A strip of sealant is applied on both sides of the inflection point of the roof. After installing the roofing material, a large free space remains in the projections of the wave. Water, snow, and debris can get there. To prevent this from happening, fill the gap with sealant, applying it in layers.

In the case of a profiled sheet, there are several options for designing the valley:

Open or closed type You choose the connection of the slopes, the structure of the entire pie remains the same. Only the method of cutting the corrugated board changes.

Roof tiles

The structure of a valley roof made of tiles is exactly the same as in the case of a profiled sheet. The difference is that the continuous sheathing must be larger - at least 35 cm wide on both sides of the joint. The fastening of the tiles in the valley has its own peculiarities - some fragments are cut so much that it is impossible to fasten them with a standard lock. Then a hole is drilled in the top of the tile and a soft, acid-resistant wire is threaded through it. Drive a nail into the sheathing, twist a wire onto it and fix the tiles in the required position.

The second option for constructing a valley with tiles.

Ondulin

In the case of ondulin, the sheathing for the valley is not solid, but two boards located at a distance of 15 cm from one another, symmetrically relative to the center of the valley. A special gutter is placed between them.

Installation starts from the bottom and moves up. The first sheet of the valley gutter is laid flush with the edge of the roofing material, and the shape is corrected. They are nailed to the sheathing from the top side. The next sheet is laid with an overlap of at least 15 cm.

After the entire gutter is laid, the installation of roofing sheets begins. First, they trim with a margin - the mark is placed 5-6 cm further than necessary. Cut along the intended line (with a jigsaw or grinder). Place it in place, mark the exact cutting line - along the protrusion on the gutter. Cut it off a second time and put it back in place. Since the ondulin sheet weighs little, all operations are easy to perform.

The laid sheet is secured with special roofing nails with a head painted to match the coating. It is necessary to fasten it into each wave, retreating as far as possible from the midline of the valley.

Installation of a valley on a roof made of Ondulin is available in video format.

Tin roofs

In private housing construction, this type of roofing material is rare, however, there are such roofs. The tin roof valley is connected manually, using a mallet and a special tool.