In modern construction, a huge number of different materials are used, which perfectly combine a high level of quality with operational characteristics, as well as functionality and efficiency. The presence of a complete set of these advantages is one of the main requirements for modern building materials, which can safely be classified as corrugated board. It is widely applicable as a facing material. And the roof device made of corrugated board, made in compliance with all technological processes, will create a practical and durable roof.
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The main characteristics of the material
What characteristic features are inherent in such a material as corrugated board? First of all, this is the method of its production. For its manufacture, galvanized steel sheet is used, on which cold rolling is used. A special coating that prevents corrosion is applied on both sides to the profile - wave or trapezoidal. Such a coating may have various shades.
Depending on the purpose, they distinguish corrugated board: bearing, wall and roofing. Any of these groups of material has its own wave height, metal thickness and designation.
For roofing, you should choose corrugated board with the letter designation "H", or "NS". The latter, by the way, is a universal material and can be used as a wall option.
The roof device from corrugated board involves the use of corrugated board, which has a height of at least thirty-five millimeters. If the roof has a short slope, then there is the possibility of using corrugated board with a lower wave height.
The use of roofing material
The technology for installing roofing from corrugated board according to SNIP involves the use of corrugated board having a height of forty-four millimeters. Roofing profiles have aluminum or zinc coating with an additional polymer layer that performs a decorative or protective role.
The basis for corrugated board can be wooden blocks or metal girders. The bearing capacity of the base depends on the wind strength inherent in this climate zone and the estimated load of the roofing material on the roof of the building. In addition, in order to adjoin the profiled sheet to the wall system, the roofing device from corrugated board provides for aprons made of galvanized steel sheets and coated with a polymer layer.
Finishing roof passes is carried out using shaped roofing elements with a comb similar to the cross-sectional profile. In addition to cornices, gutters and skates, other elements are also used in the construction of the roof structure: special plugs, snow barriers and ridge seals.
Profile sheets can be used both for cold roofs in the form of piece elements, and as part of a warm multilayer roof with a whole sheet.
Basic rules for installing roofing from corrugated board
Laying of profiled sheets should be carried out with strict observance of certain rules.First of all, this is full safety and following the installation technology in the process of lifting the material and subsequent movements on the roof, as well as fixing the main material.
Raising the corrugated board on the roof is carried out with the help of a lag by two workers, a third person takes it upstairs. At the same time, no more than one sheet rises in one go.
If there is a strong wind outside, the work on raising the corrugated board should be postponed for a while!
To move on the roof, you should wear soft-soled shoes and you need to walk on it, trying to step in the trough between the waves. To do this, lay the corrugated board so that the deflection is adjacent to the grating. Since the edge of the material is sharp enough, to ensure its own safety, work must be done with rubber gloves.
Laying of professional sheets is overlapped. The size of the overlap directly depends on the angle of the roof. The lower it is, the more overlap. For a flat surface, the material laying technology is slightly different. In this case, the sheets must be applied in two corrugations to prevent moisture from entering the roofing.
The chips that are formed when fastening profiled sheets with self-tapping screws from screwing them in must be removed with a brush. Otherwise, the rust that forms on it over time will greatly ruin the roof.
If products with a protective film are used, then in order to avoid its “fusion” with the polymer material it must be removed during the installation process.
Roofing Pie - Keeps Heat and Protects From Noise
Using roofing from a corrugated board for the roof of your house, it is very important to create good heat and noise insulation, since more than 20% of the heat the house "gives" to the environment is through the roof. And a special heat-insulating layer that performs a protective function called a roofing pie perfectly copes with this task.
What does a roofing pie under a corrugated board consist of? The first layer on the counter grill installed on top of the rafter system is insulated.
Please note that the slope of the roof from corrugated board should be at least 20%.
The next component of the roofing cake is a waterproofing layer. It is necessary so that water does not flow through the joints of the sheets and at the junctions. On top of the waterproofing, in compliance with all ventilation gaps, a crate is installed for the profiled sheet, which is laid on it with the last layer.
All layers of the pie are interconnected and perform a specific functional task. A mistake in the technology of at least one layer can lead to a decrease in the service characteristics of the entire roof and its service life. The following situations may indicate that the roofing cake was not assembled correctly:
- Leaking ceiling;
- Heat loss;
- Condensation;
- On the ice.
In the event that quality work was done to install thermal insulation, it can guarantee minimal heat loss through the roofing and prevent the appearance of surface condensate.
The installation of a special wind barrier made of vapor-proof material of a roll type will help to avoid blowing through the roof.
The sealant has two main functions. Firstly, it limits the heating of the roof space. And, secondly, it creates good sound insulation in the room. The vapor barrier layer solves the problem of moisture from the room entering the roofing cake. And the waterproofing "filling" of the cake protects the heater from the penetration of condensate into it, which usually forms along the bottom of the profile sheets.
When laying a waterproofing film, it is necessary to observe the distance between the rafters, on which it lies no more than 120 centimeters.
Crate for profiled sheets
In the roof device from a profiled sheet, a crate is an obligatory element.For single-pitched roofs, timber bars of the following sizes are used as a lathing: 5x5 cm, 3x10 cm, or 3x7 cm. Lathing elements are laid in steps of 25 cm. If the slope angle does not exceed 15 degrees, a continuous lathing made of plywood is used, OSB boards or boards. The grate for gable roofs is mounted in increments of 50 cm.
For roofs that have a complex geometric shape, in the grooves and valleys it is impossible to close the crate closely, you must leave a ventilation gap of 5 cm. The device of the roof from corrugated board requires that the bottom plank have an entry under the profiled sheet at a distance of 25 cm.
If the roof structure is provided with ventilated or chimneys, the installation of an additional crate will be required.
Fastening sheets to each other is an important stage of the roofing process
Particular attention when installing roofing from corrugated board should be paid to the fastening of sheets with each other. After all, the roof nodes from the profiled sheet are the most important point in this work. A negligent attitude towards the nodes located at the joints of the sheets can significantly affect the performance of the future roof for the worse. The very process of laying sheets does not cause difficulties, much more effort and time is spent on the places of their joints.
The main purpose of the roof nodes from corrugated board is to create isolation of transitions of the horizontal surface to the vertical and of course in the connection of profiled sheets to each other. Therefore, their implementation should be approached with particular care.
When creating junctions, the following actions are performed:
- To prevent dust and moisture from entering the junction, a bar is installed, under which the seal is arranged;
- A wall is created in the wall, which is inserted into the groove and then fixed with dowels and coated with a layer of sealant;
- The strip is connected to the profile by a self-tapping screw, which is screwed into the most protruding point of the wave.
The design of the ridge of the roof from a profiled sheet
The device of the roof from corrugated board also implies the presence of a ridge, the design of which occurs at the final stages of installation.
The ridge elements are also laid with an overlap of 200 mm. With the help of screws, they are attached to the upper corrugation. Self-tapping screws should be selected, taking into account the height of the wave of the profiled sheet. And the step to be followed when attaching is 300 mm.
If the roof has a slight slope, then the use of a sealant will be relevant. Thanks to it, it becomes possible to eliminate moisture in the case of oblique direction of precipitation. Between the ridge and the seal, the right solution is to leave a small ventilation gap.
It is most advisable to begin work on the installation of the ridge on the roof side less susceptible to rain.
The importance of proper installation
The service life of the roof of the house can be maximized if the roof device is made of corrugated board in accordance with all the rules of competent sheet fastening and factors such as:
- possible wind effects;
- probability under the influence of high expansion temperatures in the center of the sheet;
- sufficient density at the connecting points of the profiled sheets.
Compliance of the process of fixing the material to all existing standards is achieved by using certain sizes of screws for each type of work. For example, 4.8x35 mm self-tapping screws should provide a connection to the crate, but fastening the ridge will not do without longer self-tapping screws - from 80 mm.
Easy repair of corrugated roofing
One of the obvious advantages of such a roofing material as corrugated board is the speed and ease of its installation and dismantling.Therefore, when repairing a roof from a profiled sheet, there are no special difficulties.
In most cases, roof repairs can be limited to removing one or more sheets unsuitable for further use and replacing them with new ones. If the damage is very slight, then replacing the sheets may not be necessary - in this case it will be enough to put patches.
When choosing roofing material for the roof of your house, you should pay special attention to corrugated board. After all, this is not only a convenient option for installation and further operation, it is also a material having an attractive appearance and affordable price.
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