Due to its presentable appearance, metal roofing is a fairly popular roofing material among the owners of country and private houses. There are several varieties of it, differing in shape and installation technology. We will talk about how to equip a metal roof and its features further.
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Metal roofing is made of various types of elements, which are polymers, purals, polyesters, plastisols, polyvinylchlorides. The type of coating is determined by the functional load on the surface and the peculiarities of using the roofing material.
For example, a roof based on pural is resistant to ultraviolet light, and plastisol is resistant to mechanical stress..
The scope of application of metal roofing is varied. It is installed in residential and industrial facilities. Installation of this kind of roofing does not require special efforts or special equipment. But before its installation, without fail, the requirements and its operational load are specified. For example, a metal tile should in no case come into contact with a bituminous surface or with a profiled sheet. Since corrosion appears on the inner parts of the material, leading to its premature deterioration.
There is an opinion that it is because of the metal roof that lightning can easily get into the house and lead to its destruction. But, subject to the technology of installing a metal roof, this statement is incorrect..
Another material from which a metal roof is made is cold-rolled galvanized steel. The procedure for its manufacture includes several complex procedures, upon completion of which the material acquires certain positive properties..
Although the price of a metal roof is high, it is still fully justified by its advantages, namely, the durability of operation and the practical absence of the need for maintenance. When choosing a roof, which is based on high-quality galvanized steel, it will serve its owner for more than fifty years. Also, the metal roof is environmentally friendly, harmless to the environment..
Among the huge assortment of color and textured products, the consumer will be able to choose the option that will fully satisfy all his preferences. The roof made of metal is quite lightweight, so it does not load the building structure, is easily transported to the destination and installed on the roof.
Arrangement of this type of roof does not require the construction of a certain flooring, it is enough just to remove the old covering and install the roof on wooden beams.
Another important advantage of this type of roof is its fire safety and fire resistance. Despite the fact that metal is a good conductor of electricity, with the correct organization of the lightning protection system, such a roof is not able to attract lightning in a thunderstorm..
A roof with a slippery surface practically does not accumulate dirt, leaves in autumn or snow in winter, so it does not need special care.
The metal roof can be installed on all types of surfaces and roofs, even with very low slopes.
Although, among the huge number of advantages of a metal roof, its disadvantages should be mentioned. So, for example, a roof that is too steep, due to the high level of slipperiness, does not accumulate snow, and it falls on the surface next to it. In this case, there is a risk of injury to people who are nearby. Therefore, for these types of roofs, the installation of special pegs is required, which will help crush snow or ice into small particles that are harmless to human health..
High noise performance is another disadvantage of this type of roof. During rain, snow or hail, the sounds of their touch with a metal surface are clearly audible, although with the arrangement of high-quality sound insulation, this moment will be easily settled.
In addition, this type of roof needs additional thermal insulation..
There are several types of metal roofing, among which we highlight:
- flat metal roof in a roll or sheet version – for their implementation, observance of the folded technology is required;
- metal tile – in appearance it resembles ordinary tile tiles, for the manufacture of which a profiled metal sheet is used;
- coatings based on non-ferrous metals;
- metal pitched roof – used for arranging one- or two-pitched roof types.
For the correct choice of a certain type of roof, their composition, characteristics, technical features are found out and in relation to the operating conditions, the most optimal option is selected. In addition, you should find out about the presence or absence of polymer coatings applied to the metal roof during its manufacture, it is they who give it the properties of anti-corrosion, resistance to ultraviolet radiation, etc..
Among the market range of products, there is a wide variety of shapes, profile geometries, color palette and varieties of polymers found on metal roofs..
In relation to the type of base material that is part of the metal roof, it is divided into:
- stainless steel.
The first option, although it differs in its original brightness, soon fades and even turns green. Copper is great for covering monuments and sculptures. The service life of the copper roof is over two hundred years..
In addition, aluminum roofing is very popular. This is justified by its low weight, corrosion resistance and ease of installation. Aluminum is not prone to discoloration during operation. In addition, it has a high ductility and allows you to make roofs of various shapes. The aluminum roof will serve its owner for over a hundred years.
Galvanized steel roofing has high corrosion resistance. Its service life ranges from 25 to 45 years. The installation technology of this material implies a careful attitude to the zinc layer applied to the surface, since if it is damaged, there is a risk of corrosion. To extend the service life of such a coating, special paints are used, with which it is treated every four years..
Another option for metal coating is galvanized steel, on which polymer spraying is applied. They are able to better protect the roof from the external environment. The application of pural helps to protect the roof from UV exposure, and also improves its resistance to mechanical stress. Purala roofing has a variety of textures and colors, it is matte and glossy. The polyester coating is very vulnerable to mechanical damage, therefore, during the installation of such a roof, special care must be taken.
The best option is a stainless steel coating, which is characterized by excellent resistance to external influences, but at the same time, rather high cost..
The choice of metal roofing depends on the thickness of the material, which ranges from 2.6-2.9 cm.
One of the most modern roofing materials of metal origin is titanium-zinc coating. Although zinc is resistant to corrosion, its main disadvantage is its fragile properties. Therefore, the use of this material when constructing a roof of a complex shape is not possible. The titanium-zinc material contains 99 percent zinc and a mixture of aluminum and copper alloys that make it durable. This type of roof will serve its owner for over 75 years. Titanium-zinc coating is unstable against mechanical damage and the neighborhood in the form of large trees. But with its help it is possible to build a roof of almost any complexity, including it perfectly equips the nodes of a metal roof.
The most difficult in the arrangement is the metal folded roof, since for its installation it is necessary to correctly and efficiently connect the edges of the sheets bent under the fold. There is special equipment that performs this process directly on the roof surface. In addition, the option of purchasing already bent sheets and their direct connection is possible..
Metal sheet roofing is a simpler and preferable option. Sheets of the required size are cut at the construction site, with the help of a special mill, the edges are wrapped with which they are connected to each other.
The installation procedure for a metal roof is divided into several stages, which we propose to consider:
1. Carrying out work on the arrangement of the rafter system and lathing.
This procedure is the same as for the installation of any other type of roof, such as shingles. The installation of rafters is distinguished by an average pitch, because the material is quite light and does not load the structure. For the manufacture of the lathing, a 5×5 or 5×10 cm bar is used, installed with a step of 2-2.5 cm. It is this technology that minimizes the deformation of the metal roof during its operation. When arranging a flat roof, the sheathing is made solid. For the manufacture of a skate, two boards are used, connected at one point along the edges. The cornice is made solid, for its construction it is necessary to knock several boards together.
2. Waterproofing works for the preparation of the roof.
To minimize the appearance of condensate masses on the roof surface and inter-roof space, it is necessary to carry out a number of works aimed at waterproofing the rear section of the roof. In the case of working with a previously insulated roof, a crate must be attached to the rafter system, and already a waterproofing superdiffuse membrane on it. It has excellent moisture repellent properties, but at the same time allows the roof to breathe. Fastening the waterproofing starts from the bottom with a gradual transition to the top. With the help of construction tape, the sheets are fixed on the surface, if there are joints, they are overlapped by 10-15 cm. It is possible to fix the membrane using self-tapping screws and dowel-nails.
Tip: When attaching the film, leave a small amount of slack in it, which in severe frosts will protect it from narrowing, excessive tension and damage..
Next, the control metal frame of the roof is stuffed. As a result of this, two ventilation gaps are formed, located in the space between the waterproofing and the insulation layer, the waterproofing and the roofing finishing material..
3. Installation and fixing of a metal roof.
The installation of a metal roof should be started with the installation of crutches. They are nailed to areas on the cornice with a step of 700 mm. Their main function is to hold metal sheets on the roof during installation work..
It is possible to replace crutches made of wood, using steel corners 5-6 cm in size.
Next, the first picture of metal is raised up, on which the edges are already bent. It is laid close to the pediment in such a way as to form an overhang of 4-6 cm. Align the sheet and leave an edge of 3 cm to ensure the transition to the other side of the roof.
Installation of cleats is carried out from the side of attachment of the second sheet. It is fixed on the metal lathing of the roof using self-tapping screws 0.4×5 cm. The step of fixing the cleats is about half a meter. After installing the second picture, they are connected to the first. This is done in such a way that the edge of the second canvas fits snugly on the first. When arranging a roof with even edges of the paintings, make sure that they are in close proximity to each other, and a kleimer is clamped between them. Roof frames will help you rebate and complete the installation.
Due to the fact that the kleimer is inside the fold, the connection acquires additional strength.
Tip: When operating buildings in high humidity conditions, take care of additional sealing of the joint sections of the roof. This can be done with the help of “Titanium” sealant, which is applied to the pre-installed fiberglass.
Clamps are also nailed from the other end of the canvas and a third is installed. With the help of a side wind bar, the picture is fixed on the surface of the pediment. It is fixed with self-tapping screws. After the completion of the laying of all the pictures, the skate is performed, which is of two types:
Further, the arrangement of the eaves overhangs and the installation of the drainage system takes place..
4. Metal roof fencing and additional work.
Without fail, snow holders are installed on the metal roof, which prevent the avalanche-like descent of snow from the roof surface. The fastening of these elements takes place on the surface of the standing seams using screw or self-tapping connections. For the manufacture of fences, profile pipes are used.
Another important finishing point is the arrangement of lightning protection. The first step is to install a lightning rod, which is located at the highest point of the roof. In its capacity, it is possible to use:
- metal pin;
- metal cable;
- lightning protection mesh.
The best option is to install a steel pin with a size of 20 to 150 cm. The pin is installed in a strict vertical position, and the material for its manufacture is copper, aluminum or duralumin. Never paint the pin. Use steel wire welded to the lightning rod as down conductors.
The next process is to install the ground. For its construction, you should purchase several steel pins that are driven into the ground. They are connected in one circuit.
Tip: Make sure that the ground into which the pins are driven is always moist, so it must be watered in summer.