Production of a double fold. Mounting seam connections. Roofing in places of eaves overhangs

Bathroom

Main characteristics

The double standing seam lock system provides a light, stable and very durable roofing and is widely used on many different types of buildings, including education, health, sports, commercial, religious and, of course, housing. The system is suitable for pitched roofs between 3º and 90 °, vaulted roofs, conical and domed roofs, and generally almost any type of roof that elZinc® can cover.

This is a traditional system that was used for installation with zinc, since the origin of the roofing zinc itself continues to be by far the most popular method to date. Thin lines of permanent joints give the light system an attractive appearance and will contribute to its flexibility. Modern technology makes the fast operation of large roofs, reducing installation time and the associated direct and indirect costs.

It can be installed in both ventilated and non-ventilated roof structures, which allows you to choose the best solution in accordance with the characteristics of each project. The mount is hidden and indirect. Needs constant care usually uses elZinc® sheets between 0.65 and 0.8 mm thick. The coating withstands a certain amount of leg movement.

Standing rebate pattern

Standing rebate tray
Height is 25 mm.
Mount clamp (slip)

Basic connections

Longitudinal seam with a height of 25 mm double lock standing fold. The lock is raised above the drainage section of the tray.
The standing seam is formed by profiling or folding elZinc® strips and sheets into trays. It is formed along one edge (this is the edge that is fastened with clips) and overlap on the other. To make the joint, last fold around the adjacent tray, covering the clips. The two trays are then seamed using a seaming machine. 70 mm of material used to form the seam.
The seam angle is jointly limited to use at angles of at least 25 ° or higher. The double standing seam is considered weatherproof above 7 ° without compaction, and at or above 3 ° when it is sealed. This is usually done using closed cells using self-expanding seals.

Permanent seam

Lap

Small gap basic forms

Corner joint standing seam

Double Standing Seam
joint

Self-expanding on
sealing tape

Double Standing Seam
joint

Cross connections

Sometimes it is necessary to attach the folds to the ends. Without going into too much detail in this document, it can be to introduce a compensating seam on the “long” roofs (long cornices), as part of the work around the chimney or lantern, or to make changes to the width tray on the conical roof, for example. Generally speaking, the type will depend on the pitch of the roof slope, as shown here.
Save at the stage when none of the components requires any changes in the design of the substrate or side face / side stop in detail. The joint came out, however, requires a 60mm high jump to be created on the substrate, either by removing the entire upper part of the roof or by creating a fillet in the upper surface. In any case, the profile of the stage can be hidden, creating a small parapet (H \u003d 100 mm) along the lateral edges of the roof to hide a step inside the external profile of the face.

Step
Step: 3º and above
Height: 60mm
Often used as a compensator on long, low pitched roofs. A step in the substrate can be formed using fillets. Lower roof tray Continuous fixation of the strip strip “T” with the rear edge of the upper roof tray folded up widening / compressing the gap

Double lock cross welt
Step: 7º and above
Width: About 20mm
Previously, a “slide” type (as shown here) allows for excellent rainwater drainage (traditionally stamped joints can retain rainwater at low resins). None of the versions work as a compensator. Lower Roof Tray Upper Tray

Circular lock
Step: 10º and above
Circle: About 180mm
Often used as a compensator for long roofs. The lower roof tray solders the continuous bar of the upper expansion tray / gap compression

Single lock cross welt
Step: 25º and above
Width: 40mm folded, 30mm on the top tray. Can be used as a compensator on long roofs of the lower roof; a tray of 40 mm can be folded; Upper tray; expansion / compression of spaces

Fixation

Hidden fixation is indirect, using clips that cling to the seam and are (usually) threaded or nailed to below the substrate. If the length of the elZinc® trays is below 1.5m, fixed rollers can be used throughout. Trays over 1.5 m will require a combination of main clips and sliding clips to provide thermal movement of the trays, and also require provision for movement at the eaves and the ridge.
These clips should be enough in a row with the design to resist wind load for each project .. Usually 6 clips per sq. Will be enough for buildings no higher than 8 m, while the corners and edges of tall buildings will need more - see our technical documentation for more details.

Locking clip and riding clip

Dimensions

Since the pallets are fixed only along their seams, the distance between them is determined in accordance with the expected wind load, and associated with commercially available coils of width.

The location, exposure, orientation and geometry of the roof are all influenced by wind uplifts. Consult elZinc® or an installer familiar with the area when deciding on center seams. This is not only so that the roof does not suffer during storms, but also to avoid fluttering of trays in constantly windy weather.
These widths are used in combination with different thicknesses from 0.65 mm to 0.8 mm to ensure the roof meets all the criteria of effectiveness in which it is intended.
The maximum length of the trays is nominal 10 m, however this can be slightly increased on flat roofs (without additional measures necessary) or with the help of special clamps that allow more movement, maximum 15 m.

The distribution of the main clips depends on the slope of the roof - the steeper the pitch, the higher the group of main clips is positioned. This means that the lower the height of the roof, as already the trays, before the compensator can be introduced before or special measures must be taken, for example, the use of special sliding clips.

Installation

The system is installed from left to right or from right to left across the entire width of the deck or to both sides of the central “female-female” tray. The latter option provides the same width of the trays and therefore the symmetry on both sides of the lid. Our publication “elZinc ® parts, manufacturing and installation” contains detailed installation information and can be downloaded from our website.
The installation itself must be done by a specialist and reliable contractors. elZinc® upon request, contact information suitable contractors.

Appearance

The seam should always be, if possible, in the line of incidence. By itself, the boards are quite thin, but on a sunny day they cast shadows, they are clearly visible on the surface of the lid. A unique feature of thin sheets of metal roofing is the manifestation of thin wave-like in the trays under certain lighting conditions, which provide a little “vibration” and “energy” to the building.
Many architects appreciate this effect most noticeable on steep roofs (in attics) or facades. However, if desired, it can be minimized if our elZinc® material: excellent flatness and low level of residual stresses produce very flat trays that minimize these irregularities. Other measures that can be taken to reduce shadow:
. Using elZinc® 0.80 mm thick.
. Narrow tray width 430 mm

Rain drainage

Rainwater flows down the inside or parapet of the gutters or hanging gutters are usually made of zinc. They can be installed horizontally, but down to 1 in 200 is recommended, as this helps self-cleaning and increases its throughput.
Gutters are installed so that thermal movement, both between themselves and adjacent trays, covers, since along each section of the gutter, the second, introducing compensators.
You must protect the snow slide gutters from the roof by placing a pair of snow. In colder climates, installation of electric heating cables is recommended in places where ice can accumulate.
For more information about the dimensions and design of the gutters, see our technical documentation.

Roofing forms

Cylinder-shaped lid

The folded trays bend under the action of their own weight in a radius of about 20 meters. Steeper curves require preliminary curved (possibly up to a minimum radius of ≈ 40 cm). The trays are mounted on top of a cross of unventilated or ventilated tires, and on or very close to both sides of the ridge in case of a ventilated roof in the ridge. Here, the slope of the trays should allow water to drain freely on each side of the ridge, and advises a third to first meter tray. Seams should be sealed in housing ways with less than 7º.

Tray parallel curved
1. The area of \u200b\u200bthe fixed axis
2. Fan ridge

Conical roof

Conical seam trays adopt this type of coating used. The minimum between the joint axes weakly depends on the profiling apparatus used, but between 50 and 100 mm. The lid is placed on top. If the cap comes out through the outlet at the top, with the small outlet section to be checked - see our technical literature. The fixed contact strip is positioned according to the inclination of the roof.

Conical roof
1. The area of \u200b\u200bthe fixed axis

Open conical roof

Used in this document is the same type of tray and the same locking method than with a conical roof. If the lid with a hole through the air intake in the cornice, the minimum cross-section should be checked. The strip contacts (omitted from this diagram) are positioned according to the slope. This type of pan contains rainwater concentrates under the eaves, and this should be taken into account when designing the gutter to prevent it from flying over the front edge.

Conical plate

Domes

Trays should usually be made after taking measurements on the spot, determine its exact shape (degree of bending along the seams) and its dimensions. Small domes can be built and taken down by the site before being placed in position. It should provide an adequate section for air to escape at the top. Please look at our technical literature.

Curved tray

Installation and roof construction

Folded trays are not self-supporting and require continuous or almost continuous support to rest and against which its contacts are fixed. Support may be vented or non-vented, but in any case it is important to be properly installed to avoid the risk of potentially harmful interstitial condensation to the cap. Our technical publications contain more detailed information on this topic. In ventilated wood flooring used to support wood for pallets or pine, plywood or OSB external class 3. The minimum thickness of the substrate is 22 mm to 18 mm in the scene in both plywood and OSB.
These materials should be installed perpendicular to the direction of the pasture together. If there is any doubt about the pin removal values \u200b\u200bfixed in the SCE, a test must be performed to confirm that the minimum value of 560 N of the type of attachment of the proposal will be achieved.
Unventilated wooden poles can also be used, but the need to reduce thermal bridges has led many countries to use rigid heat-insulating boards, insulation boards and sandwich panels as direct support for zinc. Rigid insulation is used in combination with special pins that pierce the insulation and screw into the base underneath. Used in this way, the insulation must be able to withstand the transit of installers, and is not distorted during the entire service life of the building.
The joints of the insulating panels provide a wood base for zinc (factory gluing insulation), so that zinc is installed using pins and traditional fixation.
Three examples of the many possibilities that exist here are shown. For more information about these and other types of building packages, see our technical documentation or contact our consulting services.

Ventilated roof

elZinc® seam
Drain Membrane Function
Direct support
Wooden slats
Camera ventilation
(Optional) breathable sheet
Wooden rafters
Insulation between rafters
Control Lamina Steam with Closed Ceilings
Interior decoration

The height of the ventilation chamber should be at least 5 cm, and in some cases (low slope, large distance between the cornice and the ridge) should be increased to 10 cm - see our technical documentation. Direct support can be a wooden floor, a guesthouse or plywood or OSB, all parallel to the ledge and kills together. If desired, the breathable membrane provides additional insulation protection against cold currents, driven by the wind entering the ventilation hole from the outside.

Insulating composite cover sheet ventilated

ElZinc® seam cover
Membrane with drainage function
Composite insulation panel
Corrugated backing sheet

A composite insulating plate (factory bonding) is screwed through the vapor barrier corrugated support sheet. The vapor barrier must be a high-performance self-seal against these fasteners and all circles and passages must be closed. The outer surface of the insulation must be plywood or outdoor OSB class 3 with a thickness of at least 18 mm. Steam barrier performance is essential in this design.

Unventilated Cover - Fast-heat"

ElZinc® seam cover
Printing with drainage function
Fast Warm Mount
Hard insulation
High Performance Vapor Barrier
Support
Cabio
Interior decoration

Vapor barrier is a high performance, the effectiveness of which is important in this design, self-sealing against fixations such as "warm fast". All matches and passages must be closed. Support can be made of wood or steel. Centers standards apply to contacts, but zinc is fixed only by a screw pin. Thus, it is necessary to ensure a sufficient extraction value

Note: The colors shown here are illustrative only and should not be construed as real. To see the actual finishes, request a letter from the finished elZinc®.

Seam (seam connection) - a type of seam formed when joining sheets of steel roofing. Roofing sheets with recumbent folded joints are called paintings. Each picture consists of at least 3 sheets, or even more. The entire metal roof is a collection of diverse paintings.

Folded joints are divided into lying, standing and angled - in appearance and into single and double - according to the degree of compaction. Corner folds are simple and combined.

A. Single recumbent fold It is used to connect patterns of ordinary coating in roofing strips. The process of preparing the fold (Fig. 14):

Fig. 14 The process of preparing a single lying fold

Lay a sheet of steel on the edge of a marking table, upholstered in an iron corner, and use a scriber to apply a fold line on it 10-12 mm from the edge for sheets with a thickness of 0.45-0.7 mm or 20% further for thicker sheets. At the same time, hold the sheet tightly with your hand so that it does not move.
Make a mallet 2 beacon bends down (along the edges of the sheet), after aligning the bending line with the edge of the corner of the table (Fig. 14 a).
Fold the entire edge 90 ° (Fig. 14 b).
Turn the sheet over with the bent edge up and dump it onto a plane with a mallet (Fig. 14 c, d).
Make a similar blank on the second sheet.
Connect the edges of the two sheets into the lock and seal with a mallet (fig. 14 d).
Using a metal bar and a sub-securing hammer, cut the top sheet so that the seam connection cannot be disconnected (Fig. 14 e).

B. Double recumbent fold make for connecting pictures of eaves overhangs, gutters, nadolennye gutters. Double folds are more time-consuming, but also more reliable, so they are preferable to use when installing metal roofs of fundamental buildings. The process of preparing the fold (Fig. 15):

Fig. 15 The process of preparing a double lying fold

Fold the edge to the inside of the sheet, as in the case of a single fold blank (Fig. 15 a).
Turn the sheet edge down and bend 90 ° (Fig. 15 b).
Turn the sheet over again with the bent edge up and with the help of a mallet, fold the fold on a plane (Fig. 15 c, d). - In the same way, process the edge of the second sheet.
Connect the sheets by sliding the edge of one sheet into the edge of the other, and seal the seam connection with a mallet (Fig. 15 e).
Cut the joint with a hammer-sub-sacker and a metal bar (Fig. 15 e).

B. Single standing seam used to connect picture strips of a metal roof. Standing folds are arranged along the slope of the roof (from the ridge to the eaves). If you look at the metal roof, then you can see just standing folds, not lying ones. In addition to the obvious external differences, there is a fundamental difference in the workpiece. The recumbent seams are made on a special table (workbench), and the standing seams are directly on the roof, while the paintings are fixed to the base.

Single standing folds can be made using 2 hammers (a large hammer-handbrake and a small hammer-podsekalnik) or, using a comb bender and a mallet. The second method is more efficient and less troublesome. The edges of the paintings are bent up at a right angle previously on a workbench or with the help of 2 edge bending machines on the roof. The low edge is bent 20 mm with a slotter with a slot 20 mm high, and the higher edge with a slotter with a slot 35 mm high.

The first way to form a single standing fold: Use a large hammer as an anvil (emphasis), and a small one as a working tool. Use the small toe of the small hammer to hook and bend the higher edge to the lower. Seal the single fold using the lateral plane of the subsecond.

The second method (Fig. 16). From the side of the low edge, move the squeegee scraper close to the high edge. Adjust its height so that it matches the height of the low edge. Place a high edge with a mallet on the horizontal plane of the scraper (Fig. 16 a), and then remove the crest and press the bend of the high fold to the lower one (Fig. 16 b). Seal the seam connection with a mallet, having previously installed the comb-bender block close to the reverse side of the seam (Fig. 16 c).

Fig. 16 Formation of a single, standing fold (using a crest):
1 - comb scraper; 2 - bar comb

G. Double standing seam performed by a comb and a mallet. At the same time, the comb is placed on 4 corks to increase its height. Seam formation process:

Make a single standing fold.
Remove the crest of the comb and, after repeating the same operations, double fold, that is, fold the single fold on the inside.

You can facilitate your work by purchasing a special seam machine designed to form a double standing seam of a steel roof. However, note that this purchase will greatly facilitate your wallet: the approximate cost of the car is about $ 2,000.

D. Single standing seam with a seal in it (fig. 17). For each picture, 2 clamers are taken, which are fastened with nails to the crate. The cleaver is nailed to the bar of the crate in such a way that its “tail” rises above the bar by 80 mm. Next, the clamp closes into the crest of a standing fold in the course of its formation.

Fig. 17 Termination klyamera in a single standing seam:
1 - strip klyamera; 2 - bar otreshetki; 3 - a nail; 4 - sheet with low limb; 5 - sheet with a large limb

E. Simple corner fold. Corner folds are used to make individual small parts of the roof (for example, caps and chimney umbrellas). The process of preparing the fold (Fig. 18):

Fig. 18 The process of harvesting a simple corner fold:
a-b-c-d - a sequence of operations for the manufacture of a simple fold

Bend the edge of the steel sheet down at a right angle (Fig. 18 a).
Turn the sheet upside down and lay it on the inside of the sheet (Fig. 18 b). Remove the first sheet from the workbench.
Fold down the edge of the second steel sheet.
Turn the second sheet with the bent edge up.
Put on the edge of the second sheet bent upward at a right angle, the bend of the first sheet (Fig. 18 c).
Seal the standing seam and then dump it on a horizontal plane (Fig. 18 g).

G. Combined corner fold (fig. 19).

Fig. 19 The process of preparation of a combined corner fold:
a-b-c-g-d - a sequence of operations for the manufacture of a combined rebate

Bend the shifted edge of the metal sheet down by 30 ° (Fig. 19 e) and make a break in the bent part (Fig. 19 b).
Turn the sheet upward with the bend and roll the break in a plane along the initial fold line (Fig. 19 c).
On the bottom line of the break, make a second bend in the opposite direction (Fig. 19 g).
Take the second sheet and bend the edge down 90 °.
Set the first sheet perpendicular to the workbench, resting it on the edge of the table with a double bend.
In the slot of the second bend of the first sheet, insert a single bend of the second sheet (Fig. 19 d) and dump the vertical edge on the bend of the first sheet onto the plane of the second.
Seal the corner fold.

The height of the edges of the corner fold depends on the thickness of the metal sheet. Usually for a simple corner fold, edges are 5-6 mm high, and for a combined fold, 14-16 mm are needed.

The result of the preparatory work should be the following paintings and blanks:

1. The pattern of ordinary coverage (Fig. 20 a) represents 2 sheets of roofing steel, the short sides of which are connected by a lying fold, bent in the direction of the water flow. On the long sides of the picture has pre-made bends for the formation of standing folds. Moreover, at the places of intersection with the lying folds, the bends are not brought to a right angle by 60-70 mm, so as not to damage the folded joints. On the one hand, the limb of the standing fold should be 20 mm high, and on the other, 35 mm high. The two remaining short sides are also prepared for the formation of lying folds with adjacent paintings already directly on the roof: one edge is bent down and the other bent up.

Fig. 20:
a - ordinary coating; b - eaves overhangs

2. The picture of the eaves overhang coating (Fig. 20 b). The upper part of this picture is similar to the upper part of an ordinary picture: it has an upward bend for a lying fold, connecting it with another picture of a slope. The lower part is equipped with a dropper (lapel lip for overhang). A dropper is made as follows (Fig. 21):

Fig. 21 Formation of a dropper

At a distance of 120 mm from the end edge of the sheet mark the bending line. On this line, on both sides of the picture, cuts are made with a length of 40 mm to the right and 25 mm to the left, in order, firstly, to facilitate the dropping of the drip, and, secondly, to make the connection of the droppers of the eaves overhang more thorough with each other. Then the edge is bent down by 15 mm (Fig. 21 a). Turning the sheet upside down and bending the edge onto a plane (Fig. 21 b), you should slide the sheet so that the edge hangs from the workbench by 20 mm, after which it is bent down at a right angle (Fig. 21 c). The sheet is turned over and the edge 40 mm high is bent down (Fig. 21 g). The last time the picture is turned over and the dropper is dumped onto a plane (Fig. 21 e).

The drip can be with a single or double limb. A double drip makes the eaves overhang more durable and better drains water.

3. The picture of the wall gutter (Fig. 20 c) is also procured from 2 steel sheets. Two joint-free short sides of the sheets are prepared for the lying folds. Moreover, if the wall trough will be attached to the left of the drain for the water intake funnel, then the left bend of the painting is made up, and the right one - down; if the gutter is located to the right of the drain, then the bends are made in the opposite direction (the left bend is up and the right one is down).

An edge 13 mm wide (for a single lying fold or for a roof covered with piece materials) or 25-26 mm (for a double lying fold) bends up along one longitudinal side of the picture. This bending is necessary to connect the wall trough with the patterns of the ordinary coating or with piece materials.

A flap tape (side of the gutter) is formed along the second long edge. Previously, 200-230 mm from the sheet cut make perpendicular cuts with a depth of 30 mm. Then bend down the edge with a height of 13 mm and dump it on a plane. Turning the sheet over and making a perpendicular bend down, the final side of the gutter is formed at an angle of 60 ° to the plane of the painting, either 120 mm or 150 mm high (depending on the amount of precipitation falling in this region).

4. Strip to cover the groove (endova) is made of one or more sheets of steel. It is connected with other stripes by a double lying fold laid in the direction of the water flow. With ordinary paintings, the stripes are also connected by a double lying fold. The corners on the edges of the narrow sides of the strip are cut off.

The strip is pre-harvested for the entire length of the groove. If the width of the groove is 660 mm or less, then the strip is assembled from sheets interconnected by short sides. If the width of the groove exceeds 660 mm, then the sheets are collected in a strip, connecting with folds on the long sides.

5. Chimney collar (Fig. 22) - one of the most time-consuming and vulnerable parts of the steel roof. Making a collar requires a lot of concentration and accuracy of calculations, otherwise it will leak. A collar is made of 2 U-shaped parts connected by an overlap in the direction of water flow.

Fig. 22 Chimney collar:
1 - double lying fold; 2 - single corner fold; 3 - lap joint

Collar blanking process:

Measure the chimney.
Transfer dimensions to steel sheets. Lateral details of the collar are performed in a double copy (for the right and left sides), and the upper and lower parts are in one copy.
Connect the collar parts with either double lying folds in the direction of the water flow, or with a rivet (with 2-3 rivets) and soldering. Details in the vertical part of the collar wrapping the pipe trunk are connected by single angular folds. Slots formed at the transition points are simply soldered or patched up, and then soldered.

Actual, stylish and reliable roofing material, which perfectly combines with various architectural styles. Thanks to the classic lines this material will appeal to even the most conservative personalities.

The main feature of the double standing seam is its versatility, not only due to its appearance, but also to its technical characteristics and fixing methods.

This roofing material is suitable for sloping roofs and comes in a wide color palette.

Specifications

- * The cost of a double standing fold is calculated based on a width of 625 mm (workpiece width)

Folded seam and its types

A variety of seam seam guarantees the quality of the roof, its tightness and strength.
We use two types of seam:

The double standing seam is one of the most reliable, representing a longitudinal connection between adjacent seam folds. The edge of such a seam has a double bend. There is very little chance that water will somehow penetrate under the seam, or over time the steel sheets will begin to diverge. At the same time, the fold can be rolled up manually using special tools, as well as using a folding machine.

Klicfalz is also very durable. Two paintings are fastened to each other without the use of a special tool. This greatly saves installation time of the seam roof.

The erection of a private house is completed by roofing. This stage is considered one of the most difficult and reliable. Moreover, difficulties are associated not only with the roof device itself, but also with the choice of coating. This is quite difficult, given the huge variety of roofing materials that are on the market.

No matter how strong and hardy the material may be, the reliability of the finished roof covering will depend on the quality of connection of the individual elements. Today, the folded roof is extremely popular, during the installation of which a special type of fastening is used.

Rebate roof what is it

The seam roof is a continuous covering laid along the entire length of the ramp. Its individual elements, fold panels or paintings, are interconnected by special elements - folds.

Seam panels are metal sheets, the side edges of which are specially prepared for this type of connection.

For the manufacture of metal seam roofs, you can use ready-made paintings (0.555x8 m) or roofing metal in rolls. In the latter case, special bending equipment is used, which is installed directly at the installation site. The made picture panels can have folds of different shapes, single or double, different lengths. In any case, they are rolled in one pass.

Metal for a folding roof can be of almost any type:

copper;
aluminum;
steel;
alloys of zinc and titanium.

On a note

Galvanized seam roofs, as a rule, have a polymer layer of pural, polyester, plastisol and others.

All of them are durable and simple, do not corrode. These materials are lightweight, easily formed, can take any shape, even the most bizarre.

Types of roof folding

Metal sheets are prone to thermal expansion, which can create certain complications when joining. The penetration of water into the roofing cake can be prevented by laying on the crate under the seam roof a uniform waterproof layer. However, it will be impossible to achieve a rigid connection due to a change in linear dimensions. In this case, a voltage arises at the interface, which leads to possible significant deformations.

The only reliable option for the mechanical connection, experts consider the use of a special method - folding. By the way, the word “fold” is of German origin and means “groove” or “groove” in translation. It involves connecting the edges of adjacent paintings, which are bent in a special way. Along with this, grooves are formed, which serve to divert water.

Folded joints are classified according to two parameters:

appearance: lying, standing or corner fold;
degree of consolidation: 1. single fold, 2. double fold (photo below).

The folds are rolled mechanically manually or using a special tool, or electromechanical using special devices.

The main types of standing folds

Single. This is the simplest connection method, which is used when tilting the fold roof from 10 °.
Angular. A special L-shaped form creates volume and provides the connection with a spectacular appearance, therefore it is used mainly on “prominent” surfaces having a large area: facade, with a slope of the folded roof more than 25 °, etc.
Double. This connection is more complicated. It is performed in two steps: first create an angled fold and bend it at a right angle. The new generation of folding equipment allows to obtain a double seam seam on roof segments that are technically difficult to process. On small slopes, it is better to solder them. Transverse thermal expansion occurs mainly at the base of the fold, so there must be a gap of up to 5 mm.

The double fold protects the structure from the effects of precipitation, as well as melting snow, but it does not save from standing water either. That is why, according to SNiP, the folded roof must have an inclination angle of at least 10 °.

On a note

Nevertheless, if a special sealing tape is inserted into it before crimping the fold, the minimum slope threshold may be 3 °.

Today, another kind of folds is used - self-locking. To connect them, you can limit yourself to a simple click.

Advantages and disadvantages

The folded roof, like any other, has its advantages:

the roof covering plane, assembled from paintings on double folds, is a solid sheet with a smooth surface, from which water from precipitation and snow freely flows off;
light weight, which allows not to strengthen the supporting structure and thus reduce costs;
such a roof can be exploited for a long time - more than 50 years, given the high corrosion resistance of the coating;
high moisture resistance, which is explained by the reliability of the rebate lock and the minimum number of holes for fasteners. This level of tightness eliminates possible leaks;

simple installation for a roof of any complexity, which you can handle with your own hands in the presence of a self-locking lock;
waste when working with the material is minimal. For example, unused scraps of such expensive material, formed during the installation of the seam roof, can be rearranged to other areas. Moreover, in contrast, say, for such a coating, components are not needed. Thus, it is much more economical;
suitable for ramps of any length, both short and long.

The folded roof also has disadvantages. Among the most important, we note:

laying an additional layer of sound insulation, which will absorb noise from raindrops, etc .;
Mandatory installation of a lightning conductor, minimizing the risk of static electricity, which is accumulated by the roof covering;
the need for a quality and expensive tool.

Installation instructions

How does the rebate panels mount, how to correctly connect them to ensure durability and strength of the roof? The routing of the metal roof device involves the sequential implementation of several stages:

Sheets are made that are specially prepared for folding. This process is carried out under production conditions on an order by individual size. This allows you to get maximum accuracy when installing a folded roof. In parallel with the panels, shaped elements are also ordered, for example, overhangs or skates and more.

Attach metal sheets using a special tool or by pressing for self-locking folds.
Fasten them to the crate. To do this, use narrow strips of the same material as the sheets - “clamps”. One end of the fastener is bent into the fold during bending, the other is fixed to the crate element.

For mounting, two different types of clamps are used.

A sheet steel roof with a special edge joint is called a fold. The seam is formed by a special bend of the edges of the metal sheets. They provide a beautiful and reliable connection in which there is a drainage groove. Do-it-yourself folded roofing is as simple as any sheet roofing. Only instead of rivets, welding use a roof seaming machine. Without it, it was impossible to make a rebate roof before, but now a technology has been created that has simplified this task.

How is the rebate roof arranged?

The roof frame consists of standard layers of the roofing cake: rafters, windproof membrane, lathing, counter lathing. The front coating - rolled steel - is selected with galvanization or a polymer layer. The second option makes it possible to choose a shade of the roof, in harmony with the house, the landscape.

Steel is laid with longitudinal stripes, but it is not necessary that they be solid. For horizontal joints, a special type of folds is used: lying. It is flat and almost invisible from the side. The longitudinal edges are connected by a standing fold, forming a convex edge of a complex connection. Such a seam roof device provides the house with a durable construction with a warranty period of up to half a century. Also, the rebate lock is divided into single and double: simpler and more complicated.

Benefits and Applications

Sheet steel is an inexpensive material that is easy to work with. One person with an assistant is able to cover the roof in this way, you just need to ensure that the sheets rise up. And the construction team is able to cope with such coverage in 2 days. Low cost and high quality made it possible to use it for the repair of residential and public buildings, as well as for covering new homes. The ability to carry out installation independently and quickly made the rebate roof popular in private low-rise construction.

DIY installation

For a standard connection of panels, you need to purchase a machine for rolling up the folds. Do not bother to replace it with handy means, this may disrupt the technology, the quality of the entire roof will suffer. If there is no possibility or desire to acquire a machine, a self-locking fold roof with edges on which a special lock is already formed is used. This type of sheet simplifies installation, speeds up the work several times. A lock consists of a locking tooth that is hooked when one metal strip overlaps another. It only remains to snap the system, which takes literally a few seconds.

Tools for work

To install the folded roof you will need the following tools:

screwdriver
metal scissors
hammer, mallet, pincers
sealant gun
folding machine

Mounting is done to a metal or wooden crate, continuous or in increments of not more than 40 cm. A waterproofing layer is necessarily provided. Standard dimensions of sheets for mounting the seam roof:

width 465 mm
height of edges (locks) 40 and 45 mm

Self-locking technology makes the folded roof generally more expensive, but the ease of installation and the guaranteed quality of the joints lead to real savings in the construction of the roof.

Actual: copper roof

The coating material is not always stainless steel. The copper seam roof is distinguished by its long service life and strength due to the properties of this metal. At first it stands out with its characteristic brilliance, then becomes covered with a patina and acquires a noble shade. Copper has not been destroyed for hundreds of years, such a roof with a seam connection will become truly durable.

Mounting Features: Clammers

Regardless of the metal of manufacture, the rebate is divided into the following types:

standing
recumbent
with stiffener
with clamp

Using the clamps, panels of both types are mounted: self-locking and using tools. The clamp in the seam connection allows you to attach metal panels to the crate absolutely imperceptibly. It is of 2 types: mobile and motionless. The first is used for sheets longer than 8 m, and the second for short sheets (up to 8 m). Directly mounting is done with a self-tapping screw with a press washer. The most reliable is a standing double fold. It is made by double bending of edges, due to which it differs externally: a characteristic convex longitudinal connection is obtained.

Mounting Features

The first and all following panels have a lower lock in the direction of the next installation. The work is carried out from the bottom up, the distance between the longitudinal joints is 40 cm. There is no principle rule on which side to start installation: from left to right or from right to left. The main thing is to observe the location of the lower castle. For a metal crate, take 4.8 × 20 mm screws, for a wooden 4.8 × 35 mm. If the crate is solid, fastening is carried out at a distance of at least 40 cm; if the crate is sparse, fastening is done in each row. In places where the sheets adjoin the pipes and walls, a wall profile is used.