How to attach snow holders to metal tiles and what are they required for
Often on the slopes of metal roofs, you can see interesting structures in the form of squares or horizontal handrails. Such owners decided to put snow holders on the metal roofing. At first glance, this is an illogical decision, since the grilles will spoil the appearance and can prevent snow from melting.
Let's try to figure out what it is, and for what purposes they put snow catchers on metal tiles.
Naturally, any additional types of structures on a thin metal roof only increase the load on the roof sheathing and rafters.
Not only that, any systems for retaining snow on a metal tile roof lead to an increase in snow mass and ways to lead to deformation of the roofing. But still, there are even SNiP and GOST requirements, which oblige home owners to mount snow protection on metal tiles.
No matter how many storeys the building is, it is important that the roof is covered with a profiled steel sheet with a relatively smooth surface. As a rule, according to the instructions for installing a snow cutter on a roof surface made of metal tiles, only 2 main reasons are indicated:
- Protection of the roof overhang and drainage system from breakage and deformation.
- Protect the space around the building, exclude injury to animals and people, vehicles and equipment that are under the roof overhangs.
Please note that without such devices, up to 40% of the snow charge can come off the roof surface made of metal tiles at a time.
On the profile of wavy metal tiles, snow can accumulate to a large thickness, and at the same time, the surface of steel, which is heated from the inside by warm water vapor, due to the melted snow, at one moment can become extremely slippery. As a result, from 0.3 to 1.5 tons of snow in one second will hit the overhang and fall down.
With the correct installation of devices on metal tiles, the snow will begin to melt in small portions of several kg, which do not pose a danger.
It is known from practice that most of the snow cover begins to accumulate at the bottom of the roof slope. The upper half is approximately 3 times more wind-blown, because there is less snow there, and the layer thickness is relatively small. For this reason, the main part is recommended to be installed in the lower and middle part of the overhang. Naturally, there are exceptions.
For example, if a house under a metal tile is surrounded by tall trees, or the roof is shaded by a dense structure of neighbors, then ideally you should choose a hip Dutch or even Danish structure, or reduce the slope of the roof to the optimal 15 degrees.The upper part of the roof is built at an extremely large angle of inclination, the lower pitched half is laid at an angle of 10-12 degrees. Even 4 centuries ago, the Dutch and Danes built safe roofs without snow cutters with a width of several meters. Nowadays it is cheaper to install snow catchers than to completely rebuild the roof. The greater the distance from the eaves to the ridge and the steepness of the slope, the more elements must be mounted on the metal tiles.
Effectiveness of using elements for trapping snow is largely determined by the installation scheme of snow cutters on the roof plane. Before installing snow stoppers on metal shingles, experts advise highlighting roof sections with hatches, ventilation pipes, cuckoos, windows and ladders. Due to the shape and dimensions of the setting, the functions of a snow saw can be performed without additions. The most popular methods for attaching elements to metal tiles is considered to be a two-row checkerboard system. With this arrangement, the snow cutters perfectly keep the snow in the most dangerous roofing part, and at the same time they will not create additional wind load on the overhangs.
If the angle of inclination of the roof made of metal shingles is above 35 degrees, then additional elements must be installed to keep snow in the ridge area. It is recommended to install corner or tape extensions on the roof with a ladder or cascade.
There are different types of metal roof snow holders, and in addition to the correct placement, the elemental structure significantly affects the efficiency and reliability of the snow cap control system. Ideally, an element should meet several requirements:
In addition, snow cutters should be unobtrusive, and few roof owners will like protruding frames and large gratings that spoil the appearance of the roof from metal tiles.
One of the most reliable and simple structures, and in terms of structure and shape, the snow stoppers are two parallel horizontal pipes made of galvanized steel or aluminum, which are mounted on the brackets of the vertical posts. Installation of a tubular snow cutter on a metal tile is carried out at a distance of 0.
7 meters from the edge of the covering. Due to the small vertical distance, the snow cutter perfectly stops dense masses of snow and at the same time it is easy to pass snow, rain and melt water.
Lattice snow holders
Snow holders based on pipes perfectly withstand loads, and their stopping action may not be enough to hold a light, loose type , especially in a situation where the slope of the roof slope is large enough, the snow on the metal tiles has not yet had time to be compressed and covered with a crust of ice. If in this area the snow cover is mostly loose and dry, then ideally you should put a grid on the pipes or choose a lattice-type snow stopper made of polyaramide or aluminum alloy. Plastic elements with a grid made of impact-resistant compounds will be much more convenient and practical than steel structures:
In practice, it is known that polyaramide and polyamide snow catchers do not break metal tiles and do not peel off the polymer coating from the roof, and this cannot be said about steel gratings. Snow cutters in the form of lattice-type fences are more difficult to install, and often collect a lot of leaves and branches on the surface of the roof covering, and therefore from time to time it is necessary to climb the roof to clean the cells and remove dirt.
When purchasing roofing in 9 out of 10 cases, managers offer to purchase corner snow cutters.
It is generally accepted that profiling in the form of a strip angle of snow retention for metal tiles is better suited, and also has a greater efficiency and high degree of strength. In practice, the elements work perfectly on all roof corners, they are not afraid of strong winds or icing of the surface. Corners can be placed on almost all roof locations. But their effectiveness is limited, and even when the snow cover is more than 0. 15 meters thick, and if a crust of ice also appears, the snow stream will simply overflow over the edge of the element.
Moreover, the angle-type planks affect the redistribution of water flows from rain on roof slopes. As long as the rain is light, water will flow through the cracks onto the gutters without any problems. As soon as the amount of precipitation increases, the water will not have time to drain and go down the elements, as along the gutters, in the direction of the gables.
Installation of snow guards on metal tiles depends on the type of construction. The tow bars look like shortened corner-type snow cutters, and the length of one element is no more than 0.
25 meters. Some of the owners of a building with a roof made of metal tiles got tired of watching water flood everything around in the rain instead of going down the drain, and he decided to divide the din corner into several small ones.
The idea turned out to be very successful:
The only drawback will be the increased labor capacity of installation.
On average, three times more effort and time is spent on the installation of yokes than on simple corners.
Arc Snow Cutters
Horseshoe-shaped elements are usually considered the most invisible. The height of the arc is not more than 0.2 meters, and the diameter of the rod is from 1.5 to 2 cm.
For this reason, to consider the dense row of snow retainers on the profiled surface of the metal tiles, you need to try hard. The efficiency of such an element is even better than that of tubular and lattice structures, but the arcs cannot hold wet snow, and especially if it was mixed with rain and wind. At the moment, horseshoes are used on a small roof, and also in the role of additional structures, if the calculated number of elements turned out to be ineffective, and an urgent need to save the situation.
There are two main restrictions that are important to strictly observe when installing snow cutters. To begin with, you need to choose the right bottom line for mounting the snow barrier.
The support heel of the bracket or fence of the snow cutter should not go beyond the Mauerlat line (conditional) At first, it may seem easier to put a snow stopper on the roof overhang, but this cannot be done, because the pressure of the snow can lead to the formation of a bending load, and large gaps will appear between the sheets of material. The exception will be corner structures, and they can be placed at a distance of 0.3 meters from the cornice. The second condition is correct mounting, and one of the options for correct mounting is shown below.
The snow stopper is made in the form of a fence, on which barrier-type gratings will be mounted.
The carrier base has two anchor points, and the upper "leg" of each upright post must be secured with a self-tapping screw with a gasket. The top support point should be located in the cavity and directly attached to the batten. So, the upper "leg" of the element perceives the entire load from the snow pressure on the separation from the surface of the metal tile. A massive snow layer presses the roof against the lathing, and therefore deformation or lifting of the roofing does not occur.
The easiest to install snow guards on a metal roof will be a drag-type barrier.
A light corner made of thin sheet steel can be supplied with almost no preparation.
Installation of the yoke and the corner snow cutter
For correct installation, each element must be mounted strictly in a horizontal position, otherwise the load the roof will be uneven. Initially, a pair of marking cords are pulled over the metal tiles. This will help you navigate during installation, but anyway, each yoke must additionally be leveled by means of a building level before screwing in the screws. Attach the elements using silicone sealing washers.
Install the corner pieces in the same way, and the only difference will be the additional requirement for fixing the upper corner edge.
Installing the tubular device
To prevent the brackets from overturning the roof, it is additionally important to lay 2 boards with a width of 0 along the snow protection line. 2 meters. This makes it possible to strengthen the foundation and at the same time simplifies the installation process, you can not be afraid to miss the self-tapping screw past the batten. For installation, pull the marking cord along which the load-bearing brackets of the snow stops will be attached.
As a rule, first of all, it is required to grab the upper row of self-tapping screws to the crate, and then the pipes are mounted and fastened along the lower row of holes for installation.
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