Endova: device and principle of installation of the roof structure

How is a valley roof installed? Let's find out how complicated this procedure is, and whether it is worth paying money for it. The accumulated experience allows me to assert that anyone can cope with this task, and step-by-step instructions will clearly confirm my words.

Why do you need a groove

The inner corner formed by the roof slopes is the most vulnerable place for all kinds of precipitation and difficult to access for maintenance / repair.Water flows into a kind of gorge, forming turbulent rivers, snow is deposited in winter.

The gutter is designed to facilitate the rolling of water, preventing dampness of the roof structure.

The valley is a kind of concave lining along the length of the entire corner, laid under the junction of the slopes. How to find out if there will be many such roofing nodes on the roof of your house? This will be affected by:

1. Roof shape - T, G or cruciform.
2. Number of architectural forms, e.g. dormers/dormer windows.

Design features of the groove

In general terms, the valley device consists of two strips bent along in half at an angle similar to the angle of connection of the roof slopes. The lower bar acts as a gutter, and the second - a decorative lining.

Depending on the design features of the roof, the type of roofing material of the upper valley may not be. In any case, the installation of a roofing unit has its own characteristics, on which the water tightness of the structure depends.

General laying rules valleys:

1. Installation of the lower valley is carried out before covering the roof, and the upper one - after;
2. The groove itself is not nailed;
3. The assembly of the lower and false is made from the bottom up. Seams are sealed with Xtra Seal bituminous sealant / Icopal glue, Tytan rubber sealant, Tegola bitumen-polymer mastic;
4. The gutter bed is made of galvanized / copper, and the top is made of roofing material;

Instead of simple galvanized steel, it is better to take a polymer-coated galvanization.The material is more resistant to temperature changes - from +120 °C to -60 °C.

5. A foam sealant is glued along the edges of the valley groove (it is also a heater and additional protection against moisture getting under the roof);

6. The valley planks are fastened with self-tapping screws at the edge / kleimers over the side;
7. The height of the sides is desirable at least 2 cm. So during a downpour, the flow of water will not overflow;
8. The ends of the lathing bars are suitable for the flanging of the valley;

9. If the valley is made from several fragments, they must overlap each other by at least 10 cm;
10. Flat slopes require additional waterproofing.

Types of grooves

Depending on how the edges of the roof slopes touch each other, there are several types of roof valleys:

1. Open - typical for sloping roofs, waterproofing is required;

2. Closed - is built on steep roofs, the sections of the slopes come close to each other, hanging over the gutter;

3. An interlaced valley is almost the same as a closed valley, only the sheets of the coating at the joints are intertwined with each other, forming a continuous surface.

Each groove has its pros and cons, which cannot be ignored.

Advantages of an open gutter:

1. Water drains quickly;
2. Does not clog;
3. Installation is less laborious and takes relatively little time;

Flaw: externally, the design is unattractive, the roof has a somewhat unfinished look.

Advantages of a closed or interlaced valley:

1. The roof is doubly protected from rain;
2. Excellent aesthetic qualities;

Flaws:

1. Longer installation;
2. The need to clean from clogging;
3. Formation of ice plugs during thaws;
4. Installation of a twisted valley is difficult.

How to choose the right crate

Depending on the roofing material, the crates under the valley will be arranged in different ways. It is advisable to consult on this issue with the seller. Different roof manufacturers may have their own requirements for the installation of roof units.

Types of crates under the valley:

1. The roof under the soft roof has a solid surface, so the valley carpet will be an additional layer of waterproofing. This is the easiest mounting method;

2. Under the roof of tiles, slate, corrugated board, the bed for the gutter is made of 2-3 boards 10 cm wide along the joint. The width of the crate depends on the width of the groove;

3. Under the metal tile - additional ones are nailed between the main strips;

4. Under the ondulin - 2 boards 10 cm wide with a distance of 15 cm between them, so that the valley gutter sags between them.

Installation nuances

We have already mentioned the loads experienced by a roof with a valley, so you should pay attention to the design of the gutter. Key points of installation: sealing joints, overlap size, step between fasteners, trimming roofing sheets. From the general picture, only the groove of the soft roof, which is carried out along the continuous coating, stands out.

Instructions for laying under soft flooring:

1. The roof slopes are covered with a lining carpet at the overlap joint;
2. The inner corner is closed with a valley carpet. It is fastened along the edges with bituminous mastic and nailed in increments of 10–20 cm. The carpet should protrude 20 cm from under the cover;

3. A valley more than 10 m long is made of several fragments with an overlap of 15 cm. The edges are fixed with mastic.

Laying under metal tiles, ceramic tiles, profiled sheets:

1. Waterproofing is laid on the flooring, fastened with nails in increments of 20 cm;
2. From above, with self-tapping screws in increments of 30 cm, the lower bar is fastened in such a way that its lower end covers the cornice board;
3. Seals are glued;
4. Sheets of metal tile / profiled sheet are cut along the gutter. They are fastened not reaching 10 cm from the fold line of the valley;

The cut edge of the ceramic tile is smeared with winter engobe of a suitable color.

1. The elements of the upper bar are laid with an overlap of 10–12 cm.

It is convenient to make an exact cut line with a chopping / masking cord (INTERTOOL MT-2507, Irwin, STAYER, KAPRO). Its price ranges from 100 to 1000 rubles, depending on the manufacturer.

Laying under ondulin:

1. The installation of the valley from fragments is carried out with an overlap of 15 cm, fixing the upper corners of each segment with self-tapping screws;

2. Glue the seals along the sides;
3. Cut sheets of ondulin along the valley, nail with roofing nails into each wave as far as possible from the center of the gutter.

Around skylights

Architectural elements on the roof - skylights, attic exit, also need drainage. This installation of the valley differs from the above in that the end of the lower valley is released onto the roof tiles.

Roof window valley installation:

	Lathing in progress near the skylight
	222 Determine the length of the gutter. If the valley is not solid, the length of the lower part is determined taking into account the overlap.
	Bend points are marked on the lower fragment - this part will be brought out.
	The notched parts are bent to the side, opposite to the sides. For this, a tinsmith clamp is used.
	Bars are brought under the bar - along the edges and in the center so that the valley is slightly higher than the roof level.
	Seals are glued along the sides of the gutter.
	Bottom panel cut off, is brought under the valley planks.

Summarizing

Now you know what a valley is for: what it is, where it is located, its functions and significance for the roof. I recommend watching the video in this article, and if you have any questions, ask them in the comments.

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