Snow guard- this is a structure that holds the snow mass on the roof, preventing it from spontaneously descending. It is very important to lay the installation of snow retainers on initial stage designing the entire roofing pie.
The absence of such barriers can provoke damage to the drainage system, windows, balconies, cars standing next to the house, and even lead to tragic consequences if people are nearby. That is why we strongly recommend installing snow guards immediately after installing the metal tile.
The following are on the market types of snow guards:
- Tubular
- lattice
- Corner
- Snow stops, sometimes also called hooks
Corner and snow stops cannot hold a large amount of snow, so they are recommended to be installed in areas where the snow cover is not abundant. They are attached to metal sheet, and not to the crate, and in the event of a descent a large number snow, such a snow retainer can be torn out along with part roofing.
Lattice snow retainers, on the contrary, can withstand a serious load. Their minus lies in the fact that they do not allow the snow to come off in parts, but hold the entire volume at the same time, thereby the load on the roofing pie and the roof increases greatly, and this in turn has Negative influence for the durability of the entire structure.
The most popular type of snow retainers is tubular. On the face of it simple design, consisting of their brackets and horizontal pipes. This type of barrier can be used on any roof with any roof covering. Its main function is to initially hold and gradually pass snow between the pipes, thereby reducing the load on the roof and minimizing the danger to humans.
Installation of snow guards on metal roofing
Snow guards can be installed in several rows: from 1 to 5. It depends on the length of the slope and the snow cover in a particular region.
Below is a table by which you can calculate the number of rows of snow retainer.
| snow area | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ||||||||
| Distance between brackets, mm | 800 | 1200 | 800 | 1200 | 800 | 1200 | 800 | 1200 | 800 | 1200 | 800 | 1200 | 800 | 1200 | 800 | 1200 |
| Roof pitch | ||||||||||||||||
| Less than 15 | 37,7 | 27,1 | 25,2 | 18,3 | 16,8 | 12,2 | 12,6 | 9,1 | 9,4 | 6,9 | 7,5 | 5,5 | 6,3 | 4,6 | 5,4 | 3,9 |
| 15-25 | 23,1 | 16,8 | 15,4 | 11,2 | 10,3 | 7,5 | 7,7 | 5,6 | 5,8 | 4,2 | 4,6 | 3,4 | 3,9 | 2,8 | 3,3 | 2,4 |
| 26-37 | 16,2 | 11,8 | 10,8 | 7,9 | 7,2 | 5,2 | 5,4 | 3,9 | 4,1 | 3,0 | 3,2 | 2,4 | 2,7 | 2,0 | 2,3 | 1,7 |
| 38-45 | 13,8 | 10,0 | 9,2 | 6,7 | 6,1 | 4,5 | 4,6 | 3,3 | 3,5 | 2,5 | 2,8 | 2,0 | 2,3 | 1,7 | 2,0 | 1,4 |
| 46-55 | 11,9 | 8,7 | 7,9 | 5,8 | 5,3 | 3,9 | 4,0 | 2,9 | 3,0 | 2,2 | 2,4 | 1,7 | 2,0 | 1,4 | 1,7 | 1,2 |
Based on the table and figure, we correlate the angle of inclination of the roof and the snow area and determine what is the maximum length of the slope for one row of snow retainers. If the value of the slope length turned out to be greater than the actual length of your slope, then more than one row of snow retainers is enough. If less, then 2 rows are needed. If it is less than 2 times, then 3 rows of snow retainers are required, etc.
In construction sites located on the borders of snowy areas, it is recommended to install snow guards based on the area with a greater snow load.
Snow guards must be installed:
- continuously
- along the entire roof line in one level and over protruding elements
The following tools are required for installing snow guards:
- level
- screwdriver
- jigsaw
Attention! The use of a grinder is strictly not recommended, so as not to damage the polymer coating.
To achieve the desired size of the entire structure of the snow retainers, the pipes can be joined together. For this, a crimp is provided at the end. From above it must be fixed with an M8 bolted connection.
It is recommended to use a continuous crate in the installation areas roofing elements security (SNiP II-26-76 "Roofs"). We advise you to consider the installation of snow retainers at the stage of calculating the construction project.
Complete set of snow retainer for metal tiles
Installation of snow retainers on the rebate
Installation of snow retainers on metal tiles - step by step instructions
1. Outline the location of the snow retainer on the metal tile next to the eaves at the level bearing wall and places where you need to make holes for fasteners. The bracket is mounted strictly at the bottom of the wave. The distance between the last bracket and the edge of the pipe must not exceed 300 mm.
2. Drill holes with a metal drill exclusively in the metal tile, without affecting the crate.
4. Fix the bracket by tightening the screws. The maximum allowable step between the snow retainer supports is 900 mm.
5. Insert the pipes into the corresponding holes in the supports.
6. Combine the pipes along the entire length of the slope and fix with an M8 bolted connection.
Installation of snow retainers on a seam roof
1. Outline the location of the structure on the roof near the eaves at the level of the load-bearing wall and the place where it is necessary to put the brackets for fastenings. The bracket is mounted to the seam connection. The distance between the last support and the edge of the pipe must not exceed 300 mm.
3. Insert the pipes into the corresponding holes in the supports.
4. Combine the pipes along the length of the roof and fix with M8 bolts.
Video installation instructions
When designing a roof, attention should be paid not only appearance, cost and functionality of roofing, but also think about safe operation. Snow guards and other roof safety elements are necessary and have a very important function. The fastening of such structures will allow the roof to remain reliable and durable and ensure the safety of all residents of the house.
When buying roofing material, almost everyone asks the question: is it worth buying snow retainers on the roof or can you do without them? We will analyze in which cases it is imperative to install security elements, why they are needed and what type of snow retainer is suitable for a particular roof.
Types of snow retainers: tubular and lattice elements
Snow guard or snow stop - additional element roof, preventing a sharp descent snow mass. In other words, the material cuts through large "caps" of snow and ice, protecting objects in the immediate vicinity of the building. Therefore, it would be more correct to call such an element a snow spreader. According to the form and purpose, all roofing snow retainers can be divided into the following types:
- Tubular snow retainers;
- Lattice snow retainers;
- Metal strips of the snow retainer;
- Snow retention elements for a specific roofing material.
The first two types can be classified as universal security elements, since they are suitable for almost any roof. Tubular snow guards consist of two pipes of round or oval section, brackets (supports) for fixing pipes to roofing material, fasteners and rubber EPDM seals.
Fasteners and gaskets
As hardware, screws are usually used for fastening a log with a size of 10x60 mm. The length of the pipe is usually 1 or 3 meters, and the number of supports is 2 or 4, respectively. Usually builders purchase 3-meter elements, which, if necessary, can be cut into the right dimensions. Tubular types of snow retainers usually differ in the design of the supports. At universal type she has a flat flat surface, which allows you to install the element both on a metal roof (metal tiles, corrugated board, seam roofing), and on flat material(for example, flexible tiles).
Universal supports of the tubular snow guard Lattice snow guards, in addition to the main functions, they are often used as roofing fencing systems. Due to the presence of a lattice, it is much more effective than other types. Mounts and installation method is similar to the tubular type of snow retention.
Lattice-type snow guards Due to their functionality, lattice elements are often used in large high-rise buildings co pitched roof. For large objects, roof fences can play an additional role as snow retainers.
Snow guard for folded roof
In the case of a seam roof, the supports are somewhat different from the universal ones and are pressed on both sides of the end area of the seam with the help of special brackets, which are tightened with bolts.
Snow guard for folded roof The set of material additionally includes brackets and bolts for fixing on the seam of the seam roof.
Tubular snow retainer for ceramic and cement-sand tiles
An important point is that snow retainers for natural tiles (ceramic, cement-sand), or rather pipe brackets, must be installed at the time of installation of the roof, since they are attached to the batten board.
Snow guard for ceramic roofing Now let's move on to snow retainers for the most popular roofing materials.
Snow guards for metal tiles and corrugated board
In the case of metal tiles or corrugated board, several types of snow stops are offered.
Specialized snow retainer supports for Monterrey profile metal tiles have a characteristic step for convenient fastening the bottom of the support through the roof to the crate.
Snow guard for metal tiles In the assortment of additional elements of metal tiles there are metal slats for snow retention. Available in 2 meter lengths.
Metal bar for snow retention The bar is completed with an additional steel support, which reinforces the entire structure of the snow retainer. The metal bar is part of the components of the metal tile or roofing sheeting, therefore, it is made in the same coating as the material itself. The element is fastened in the upper part of the wave with roofing screws 50 mm long.
Aquasystem company specializing in the production drainage systems and roofing accessories, offers another solution for metal tiles.
Aquasystem snow guards Snow retention elements for flexible tiles (soft roofing)
In the article about, we already mentioned specialized snow retainers for soft roof. Snow guards are small triangular-shaped elements with perforated bases for mounting on the surface of OSB or moisture-resistant plywood.
Snow stopper shingles
After installation, the attachment point is closed with the next layer of flexible tiles. This solution looks very neat and has long been loved by architects and builders. Table with data for calculating snow retainers:
If at the time of installation of the roof the snow stops were not installed, you can subsequently fix them on soft tiles conventional tubular snow retainers with a universal flat support (bracket).
Snow retention on Ondulin
For different types corrugated bituminous sheets of the "euro slate" type (Ondulin, Nuline, etc.), tubular snow retainers are also installed by analogy with metal tiles or corrugated board. In order not to damage the roof, for Ondulin it is necessary to select a snow retainer, the bracket of which has a narrow base. In this case, the safety element can be fixed at the bottom of the wave. Do not forget about special gaskets in the attachment points for hermetic installation to the crate.
Metal strips or lattice systems can also be used as snow retainers.
Calculation of the number of snow retainers
To determine the number of tubular snow retainers, we will use the instructions from the manufacturer of roofing and facade materials- Grandline. The company offers a table that shows the values of the angle of inclination of the roof slope and the snowy region of Russia. The intersection of these two values will be the maximum length of the ramp, at which 1 row of snow guards will be enough. If the slope length in the table is less than the original one, we set the snow retention elements in 2 rows, if it is 2 times less than the original one, 3 rows, etc.
Snow retainer calculation table To determine the snow region, we will use a map with values from 1 to 8.
Map of snow regions For example, we have a house located in Moscow, the roof slope of which is 30 °, and the length of the slope is 6.5 meters. According to the map, the Moscow region is located in the snowy area No. 3.
Snow regions of Russia We combine the values \u200b\u200band get that when mounting the brackets (supports) of the snow retainer after 800 mm, 1 row of elements is required with a slope length of up to 7.2 meters. Because our 6.5<7,2 в нашем случае устанавливаем снегозадержатели в один ряд. Но мы не можем монтировать кронштейны через 1200 мм, т.к. длина нашего ската больше 5,2 метров. По аналогии количество рядов и расстояние между опорами можно определить для любого региона России.
Table of values for the maximum length of the slope when installing snow retainers, depending on the slope of the roof and the snow area:
Values of the maximum length of the slope from the ridge to the snow guards Installation instructions for tubular snow guards
Before proceeding with the installation of roofing snow retainers, read a number of recommendations:
- It is advisable to use a continuous crate at the place where the brackets are attached (SNiP II-26-76 "Roofs").
- Can't be cut snow retention pipes using an abrasive tool such as "grinder".
- To achieve the required length and improve rigidity, tubular snow retention systems are installed in one line, not in a checkerboard pattern.
- An additional row is installed above the protruding roofing objects (dormer window, chimney or ventilation pipe, etc.) or near the vulnerable places of the roof (valleys, junctions).
The snow guard is mounted in the lower part of the roof at the same level as the wall of the facade of the building or slightly higher (taking into account the wave pitch in the case of metal tiles).
Snow guards are installed next to the cornice at wall level. Photo: grandline.ru Important: when mounting on a metal tile, the brackets are attached strictly down the waves of the roofing material!
Mounting distances for snow guards A distance of no more than 500 mm from the edge of the slope to the snow retainer pipe is allowed. The distance between the brackets should not be more than 900 mm, and between the outer bracket and the edge of the pipe no more than 300 mm.
The main mistakes in the construction of snow retention systems:
- Safety elements should not be installed in a checkerboard pattern. That's right - in one row, joining each other.
- Not respecting the distances shown in the image above.
- The use of conventional roofing screws as fastening of the snow retainer support to the crate significantly reduces the level of snow load. Use the fasteners included with the kit.
We also suggest that you familiarize yourself with a short video instruction for installing snow retainers from the manufacturer of roofing materials Grand Line.
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Last revision: 11/28/2014
One of the most dangerous manifestations of the spring thaw is, as you know, the unpredictable fall of melting snow from the roofs of buildings, often resulting in injury to bystanders (sometimes fatal).
For owners of private houses, it is not difficult to completely remove such a threat, or at least reduce it to a minimum - it is enough to manually remove the snow mass in time, which has not yet completely dried up on the roof surface. In addition, you can simply install snow guards , allowing to keep snow from unpredictable falling and "pit" it from the roof surface in small portions.
Snow that has accumulated in excess can destroy (push through) the roofing, and if it comes off too sharply, tear it off or damage the protective layer on the material.
In addition, an unexpected snow mass can break wires, as well as damage or disable air conditioners. To properly install the snow retainer on the roof, we recommend that you read this article.
Types of snow retainers
There are the following types of snow retainers:
- corner;
- tubular;
- lattice structure;
- lamellar;
- grid.
Classic snow guards can be made in several versions:
- in the form of brackets fixed on the roof sheathing with two-row metal pipes passed through them. The possibilities of snow retention in such a design can be adjusted by changing the distances between the pipes, as well as between the lower pipe and the roof. By adjusting the mounting pitch of the brackets, it is possible to change the system parameters according to the allowable load.
- in a lattice version, which involves the installation of rigidly fixed brackets with lattice sections fixed to them;
- in the form of lamellar or corner snow retention elements, which are usually mounted on flat roofs made of metal materials (metal tiles, galvanized steel, etc.). Such systems are not designed for increased loads and, as a rule, are ineffective.
Installation
Self-installation of plate (corner) snow retention systems on the roof is possible, but subject to certain conditions. So, to install snow retainers on metal tiles, for example, it is necessary that the roof slope angle be no more than 30 °.
Installation of such snow retention elements is carried out in the following order:
- First of all, at selected points of the roof, support brackets (plates with a corner) are installed, made of durable metal, on top of which a decorative overlay made of roofing material is attached.
- in the case of installation of corner-type snow retainers, the latter are mounted in two rows along the height of the slope, alternating through one element;
- in this case, the lamellar elements are attached to each wave of the metal tile, while the corner elements are fixed in each wave along the upper row and through the wave - along the lower row.
When using tubular and lattice snow retainers, their installation is possible both during the construction of the roof and during its operational operation (on the finished roof). In this case, the type of coating used is not significant, since it is possible to fix the brackets on such a surface without much difficulty.
They are installed vertically on the plane of the roof and are fixed on its surface in the most convenient way for you. In the case of fastening the brackets along the joists of the crate, depending on the planned dimensions of the structure, their length can be from 300 to 1000 mm.
Note! On the slopes of a large area, snow retainers can be mounted in several rows (with a solid fence or in a checkerboard pattern).
As for the slope restrictions, this indicator is not standardized for these fence samples. In this case, roofs with a slope angle approaching 60 ° are not taken into account, since in this case the snow on the roof does not hold by itself. An interesting conclusion follows from this that it is possible to completely get rid of problems with snow retention if a roof with a large angle of inclination of the slope (with allowable wind loads) is laid in advance in the project.
The validity of this conclusion follows from the fact that it is much more convenient to clear the roof of snow with a completely flat slope surface without snow catchers placed on it. In the presence of the latter, on the contrary, the removal of snow from the slopes should be carried out as often as possible, which is necessary to remove excess weight from the roof structure.
We note in passing that even in the absence of snow retainers in the northern regions of our country, by the end of winter, a layer of snow on roofs with an area of \u200b\u200babout 80-100 m² can reach an average weight of 8 to 16 tons.
There is another circumstance that should not be forgotten when installing snow retainers with your own hands. We are talking about the use of auxiliary equipment on the roof, without which snow removal can turn into an unsafe event. The composition of such protective devices should include fences (with a building height of more than 6 meters), which are mounted around the perimeter of the roof, as well as roof ladders or stairs of a special design that allow you to move freely even on a heavily snowy surface. The perforated surface of these ladders does not retain snow and provides good grip with any type of footwear.
When carrying out such work, no one relieves you of the obligation to comply with safety regulations. Any high-altitude work should be carried out only with a safety mounting belt and shoes that prevent slipping on an icy surface.
Video
Another video about choosing a snow retainer:
Photo
Regular snow removal from sloping roofs is a real problem in the central and northern regions CIS. At the slightest thaw, massive layers break down, risking causing damage to property and health bystanders.
This unpleasant phenomenon can be prevented by snow retainers - enclosing structural elements that are installed on the roof. We will talk about them in our article.
In colloquial speech devices are named after: snowshoes, snow guards, snow barriers, snow blocking fences, snow cutters and even snow guards.
So why do we need snow guards? It's simple: they do not allow the ice cover to slide off the roof. Eat 2 main classes according to the principle of protection:
snow cutters. Divide a large layer into smaller "portions". This helps to keep the cover on the roof. But even if a small part falls, there will be no serious damage.
snow barriers. They fix all the snow on the roof, allowing it to slowly melt under the sun's rays. The resulting water freely enters the gutter.
The choice of design of snow stops depends on the following factors:
The angle of the roof.
Roof material.
The height of snow cover in the region.
Installation of snow guards relevant only when, When the angle of inclination of the roof does not exceed 60°. Otherwise, nothing can stop the snow from falling off.
Typical tubular snow retainers - metal prefabricated structures, consisting of 3 brackets with fasteners designed for installation on the roof. Fasteners - self-tapping screws 8×60 mm. In the holes on the supports pipes are inserted. Their diameter varies from 15 before 30 mm. Device height reaches 150 mm.
Minimum distance from the roofing material to the first pipe should be 20 -30 mm, and the run between the two pipes - 80 -100 mm. The high strength of the barrier allows it to be installed on roofs with a slope up to 60 °. Refers to snow cutter class. Suitable for any roof.
The video shows the installation of brand products " Grand Line»:
Mounted tubular devices solid line along the perimeter of the roof at a distance 400 -500 mm from the eaves. In regions with high levels of snow cover, a second row may be needed with a run-up from 2 before 3 meters.
Standard lattice snow guards consist of steel brackets and a metal mesh vertically fixed to them. Height indicators are in the range from small - 50-70 mm to large - 150-200 mm.
Refer to class of snow barriers. In terms of reliability, they are inferior to tubular products. "Grates" are mounted in a row, placing them at a short distance from the roof eaves.
Information about snowshoes is available on the video:
With the length of the roof slope over 5.5 meters in tandem with lattice devices use additional- corner.
If the roof slightly covered by precipitation, it is advisable to use lamellar snow retainers, which are also called corner ones. These are triangles with mounting brackets, made of thin metal resembling corrugated board.
Product height does not exceed 40-60 mm. Due to low rigidity, they are installed only on roofs with a slope angle of up to 30 °. Corner barriers are placed in a checkerboard pattern. Minimum required 2 row with a run from 0,5 before 1 meters between them.
You can get a general impression of the designs after watching the video:
Spot snow retainers are narrow metal hooks. By virtue of low barrier function, devices apply only in pair with tubular and lattice structures, or in regions with low snow cover.
Snowshoes are good for soft roofing materials. Yokes are mounted in checkerboard pattern, observing the minimum indent between them - 500 -700 mm.
For more product information, please watch the video:
Spot products are attached to the roof sheathing before installation of roofing materials.
The ideal solution would be to install snow retainers around the perimeter roofs. But if finances and time are not enough, you can limit yourself to protection major plots: pedestrian zones, car parking spaces, balconies And skylights.
With sloped roof 35 ° snow can fall a distance 0,4-1,5 meters from the gutter.
Snow barriers should be installed with indented from the cornice overhang if it is not adjacent to the rafters. The minimum distance from the edge of the roof is 500-800 mm.
The smooth surface of the metal tile is an ideal factor for regular avalanches. To protect property and households, tubular, lattice or lamellar snow retainers should be used. The latter - only in regions with a low level of snow cover.
The installation process consists of the following steps:
markup. We mark the place where the snowstop will be.
Gain. Add a reinforcing bar to the crate.
Assembly. We connect all the elements together.
drilling. We make holes in the lower wave of the metal tile.
Anchoring. We fix the snow barrier with self-tapping screws 8×60 with rubber seals.
Completion. We insert pipes into the brackets or connect the lattice structures into a block.
How the stronger the slope angle, the more often brackets should be installed. Minimum run - 500 mm. On long slopes, larger in size 5,5 meters, you need second row snow retainers.
As you can see in the photo, the profiled sheet is a smooth material. Slipping, the snow not only falls down, but also scratches the protective coating of the metal. Tubular, lattice and corner snow guards are suitable for this type of roof.
Mounting process no different from what is typical for metal tiles. Need to reinforce the crate, drill holes in the bottom wave, screw snow stops with bolts with sealed gaskets.
Corner structures do not need to strengthen the base, because they are lightweight and are held in the upper wave of the corrugated board on self-tapping screws screwed through the metal into the wood of the crate.
To protect seam roofs from excessive accumulation of precipitation, only tubular and lattice snow retainers. In this case, the brackets are mounted directly on the fold in the following sequence:
Clamp installation. We hang the bracket on the fold.
drilling. We make holes in the clamp.
Fixation. We insert bolts into the holes and tighten the nuts.
The solution is good because for its implementation no need to strengthen the roof sheathing additional bar. The distance between the brackets depends on the angle of inclination, but it is more reliable to install a clamp on each fold.
Although slate is a rough material, during a thaw snow can still slide down it. Therefore, on the roofs lightweight corner snow guards. Their rigidity is quite enough to cope with medium pressure. The structure should be mounted only on the upper wave.
Slate - very fragile. It must be drilled with extreme care. Self-tapping screws screwed through the sheet into a wooden crate can be used as fasteners. The main thing is not to overtighten, otherwise the snow retainer will make a hole in the roof. Be sure to use rubber gaskets.
On soft roofs made of ondulin, shingles and other materials, there is a topping that protects against snow masses. The angle of slope on such roofs does not exceed 15 °, and the crate is made of moisture-resistant plywood. Therefore, it is advisable to use yokes.
Point fences are placed in checkerboard pattern. The optimal number of rows is from 2 before 3 . And the distance between the two hooks should not be less 500-700 mm.
In exceptional cases, installation can be performed on a soft roof tubular stoppers. It is advisable to use galvanized products, for example, the trademark " Grand Line».
Sometimes it is difficult to make a choice and accurately understand how many rows snow guards must be installed on the roof. There is a calculation method based on 3 parameters:
Slope length. The mass and density of the snow cover depends on this distance. It can be viewed in the project documentation for the house. The unit of measurement is meters.
Tilt angle. The angle at which the roof is tilted relative to the horizon. The value can be found in the construction drawings for housing.
| snow area | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ||||||||
| Distance between brackets, cm | 80 | 120 | 80 | 120 | 80 | 120 | 80 | 120 | 80 | 120 | 80 | 120 | 80 | 120 | 80 | 120 |
| The angle of the roof, hail. | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Under 15 | 37,7 | 27,1 | 25,2 | 18,3 | 16,8 | 12,2 | 12,6 | 9,1 | 9,4 | 6,9 | 7,5 | 5,5 | 6,3 | 4,6 | 5.4 | 3.9 |
| from 15 to 25 | 23,1 | 16,8 | 15,4 | 11,2 | 10,3 | 7,5 | 7,7 | 5,6 | 5,8 | 4,2 | 4.6 | 3.4 | 3,9 | 2,8 | 3,3 | 2,4 |
| 26 to 37 | 16,2 | 11.8 | 10,8 | 7,9 | 7,2 | 5,2 | 5,4 | 3,9 | 4,1 | 3,0 | 3.2 | 2,4 | 2,7 | 2,0 | 2,3 | 1,7 |
| 38 to 45 | 13,8 | 10,0 | 9,2 | 6,7 | 6,1 | 4,5 | 4.6 | 3,3 | 3,5 | 2,5 | 2,8 | 2,0 | 2,3 | 1,7 | 2,0 | 1,4 |
| 46 to 55 | 11,9 | 8,7 | 7,9 | 5,8 | 5,3 | 3,9 | 4,0 | 2,9 | 3,0 | 2,2 | 2,4 | 1,7 | 2,0 | 1,4 | 1,7 | 1,2 |
We find in the table the figure of the snowy area. Let it be St. Petersburg - 3 . We define tilt angle. We have - 20 °. We are watching on intersection point indicators. It turns out enough one row stoppers, if the slope length is not more 10,3 m and the distance between the brackets is 80 cm.
If the length of your slope less than the table value- one row is enough. When the parameter in the table less than you- Requires a second row. If he less than 2 times- you need a third row of snow retainers.
In areas with snowy winters, the installation of snow retainers is a mandatory step in the construction of the roof. A large amount of snow that has fallen in the wrong place can damage the roofing material, the roof structure itself, wires, air conditioners and ventilation systems, and even cause injury to people.
Types of snow retainers
According to the type of construction are:
- tubular,
- lattice,
- lamellar
- hooks.
Tubular snow retainers - metal pipes threaded in 2-3 rows into special holders installed on the roof. The retained volume of snow depends on the thickness of the pipes, the distance between them and the roof, between the fasteners. The advantage of this design is the ability to increase the length and increase the allowable load by more frequent arrangement of fasteners and pipes.
Lattice snow guards are like a ladder mounted on an edge across the roof. They are made of a metal profile or corner and are just as easy to lengthen and strengthen as tubular ones. Lattice and tubular types are the most versatile and reliable, they can be installed on roofs, both from natural tiles and from sheet materials.
The plate version is able to hold less snow, but is the least noticeable on the roof. They are usually made from the same material as the roof itself, and they are more suitable for flat roofs made of metal profiles, metal tiles, etc.
Hooks also retain a small amount of snow and are usually installed on roofs covered with soft materials: ondulin, shingles.
Lamellar snow guards and hooks are cheaper and easier to attach, so it is quite possible to use them in regions with little snow or short winters. The roof on which they are installed should have a slope of no more than 30 degrees. One of the varieties of the lamellar snow retainer is the corner ones, which in the section are a triangle.
It is necessary to decide which type will be used even before starting work on, since it is better to fix them at the same time as the roofing material. An exception can be made for tubular and lattice structures, but for them it will also be necessary to provide reinforcement of the crate. They can be mounted on the roof of any material. Their number and frequency of location depend on the amount of snow falling on average during the winter.
Fastening rules
When planning the installation of snow retainers on the roof, a number of rules must be taken into account.
- The crate in the places of the proposed installation must be reinforced, and the elements should be attached only to it.
- The lower element should be located at least 40-50 cm from the edge of the roof.
- Snow guards are located across the roof, parallel to its lower edge.
- They can be located in a line (preferably for tubular and lattice) or in a checkerboard pattern (lamellar and hooks).
- If the roof area is large, then several rows are arranged with a distance between them of 35-40 cm.
On roofs with a large slope, about 60 degrees, you can avoid installing snow retainers, since the snow comes off on its own. However, strong winds negatively affect such a roof, and more materials are needed for its construction.
Preparatory stage
Even during the construction of the crate in places where snow retainers are supposed to be fixed, it must be reinforced with a board with a thickness of at least 25 mm. Subsequently, fasteners will be mounted to it. All installation work, as well as other roofing activities, must be carried out with insurance, observing safety precautions.
Installation of snow guards
The delivery set usually includes the pipes themselves, a grate or snow retainer profile, a support element, and a decorative overlay. First, the places for future installation are marked on the roof, and a lining element is attached to the roof. For corner snow retainers, the decorative overlay rests with the side directed upwards on the lining, for lamellar ones it is superimposed from below in the direction of the roof. The lamellar one is screwed onto each comb, the angled one is screwed onto each comb from above and through one from below.
If there is a roof window on the roof, a snow retainer must be installed on top of it.
For fastening, it is important to use galvanized self-tapping screws, preferably with a rubber cap, to prevent rusty drips on the roof. Mounting holes are sealed with rubber gaskets and waterproofed with sealant.
Important! The installation of snow retainers does not relieve the need to clean the roof of snow. Thanks to these structures, snow accumulates on the roof and increases the load on it. As a result of the large weight of snow accumulated on the roof, the snow retainers themselves may break and the roofing material may sink.
