The contents
The choice of a suitable material for roofing is necessary to think still on the design phase of the building. This will allow you to select any roofing material, from light sheeting to natural tile, which requires the creation of a reinforced truss construction. From all variety of materials for the roof, sometimes to choose either the only to be difficult, and in this case, you should definitely pay attention to such material as metal, the properties of which allow its use in any climatic zone of our country.
The device of metal roofs has many advantages over other materials:
- the optimal characteristics of the coating;
- low cost;
- a wide selection of colors;
- the choice between glossy or matte coating;
- excellent performance;
- durability.
In addition, it is worth noting the relative ease of working with this material, especially if the roof has not has a complex geometric elements. In order for the roof of metal has long maintained its attractiveness and excellent performance in terms of protecting the building from moisture penetration, choose this material carefully, paying attention to the following points:
- the quality of the profiling depends on the quality of the joining of the sheets during stacking;
- the thickness of the metal – it varies in a quite wide range;
- the thickness of the outer polymer coating.
Practical advice on the choice of metal can optionally be viewed in the video
Preparation of roof under metal roofing ↑
In order that the new roof was strong, beautiful and provide comfort in the building, including acoustic, it is important to carry out preparatory stage works. If metal «replaces» the old roofing material, it is completely removed from the roof, and as the truss is carefully checked visually. Eliminates all the bumps, crate impregnated fire and bio protective composition applied in several layers with intermediate drying, corrupt and unreliable elements are replaced by new.
If the roof is being built on the new building, priority should be given to the installation of lathing, as the main element that will have to take the brunt of roofing material. To create it using only well-dried lumber of softwood (timber, edged or unedged). It is very important to ensure that no wooden elements protruding knots or other defects – traces of decay, pockets of mold or evidence of pests. If the wooden elements are not covered with protective compounds during production, this should be done manually. Naturally, all work is carried out in dry weather.
After installing the rafters, on which is fixed a layer of waterproofing. It is better to use a roofing material, and modern polymer film, and insulated roof vapour barrier membrane is used. After this you need to fix the counter-batten, which will provide the necessary ventilation gap. Their attachment is made or galvanized nails, screws or blue. If, by mounting the counter-you have to mend the Board, you must ensure that both ends were in the rafters.
How to calculate the amount of metal on the roof ↑
Before purchasing the material is very important in the calculation of the metal on the roof, because if the material is not sufficient for full «closing» the roof, and it would have to buy, there are slight differences in shade. It is therefore very important to know how to calculate metal roofing on the roof, because if there are a large number of surplus, to find further use in the economy will not be easy. For calculation is not enough to calculate the area and know the exact size of the sheet metal for the roof. You need to understand that a certain portion of the material will remain unused, but it is inevitable.
The correct calculation starts with measuring the area of the roof. The more complex the geometry, and the more complex elements (turrets, window, etc.), the harder it is to carry out the correct calculation on their own. Further complicating the task is the fact that all types of metal for the roof are laid in a specific order – each sheet has a top and bottom, positioning them as convenient will not work. The more on the roof of the external and internal angles, the more the material will go to waste – is to be taken into account in the calculations.
You should know that despite the stated manufacturer the size of the metal for the roof, each sheet has «useful» size – it is smaller than the physical sheet size. So, with a width of 1.18 meters, «useful» sheet size is 1.1 meters – everything else «go» for the formation of overlap. The length of the sheet of metal can be almost any – if you order the material directly from the manufacturer.
An important point to consider when the independent computation is the inability to cut the sheet «both have». RES is allowed only in certain places, otherwise formed almost guaranteed unrecoverable deformation. If you do not want to involve the counting of material to calculate the metal on the roof will help you a special calculator.
How to choose a quality metal roofing ↑
Before you choose a metal roof, you should get acquainted with its technical characteristics, especially its thickness. In that case, when you create the roof for small farm buildings, you can save a little and buy a metal thickness of 0.4 mm. If the roof is designed for residential buildings, sheet thickness shall be not less than 0.5 mm – savings in this case is inappropriate. currently, the types of metal a lot, but for home should be chosen such that the decorative coating consisted of at least three layers:
- the passivating layer;
- primer;
- a colored polymer coating.
If you purchase the question is what metal is best for roof and product reviews are missing, you need to ask the seller a small sample that you can break, scratch or take any other action to ensure the quality of products. A huge impact on the lifespan of the metal having the kind of used polymer coating. So, the most impressive features have leaves coated with Pural or PVF-2. They are resistant to UV rays and other aggressive impacts, and long service life.
When choosing, it is important «not to miss» and with the color of the coating. It is advisable to choose the color that will fit into the existing landscape. Also, you should consider the fact that, by choosing dark shades of metal necessary to provide a very good ventilation of roof space, otherwise the house will be overly stuffy. Matters and the outlet where purchased metal. It is advisable to choose the shop where you can purchase all necessary accessories. For example, all kinds of remarkable metal, the use of which is necessary on roofs with slopes.
Installation of metal – haste will only hurt ↑
In spite of sufficient simplicity of working with this roofing material, to hurry when it is mounted should not be. Before we start work on the installation, determine the minimum angle of the roof is of metal, to acquire all the necessary components, for example, elements of the drainage system, prepare the necessary tools. It is vital to consider the proper level of ventilation, which will need to ensure unhindered air outlet from under the ridge and sufficient clearance between the waterproofing layer and by the sheet metal.
Attention! It is unacceptable to cut the metal with «grinders», since this leads to surface heating, stratification of the polymer of the protective layer and exposure of the metal, which may the emergence of foci of corrosion. It is better to use special scissors.
We must not forget that a roofing need to be addressed before the start of work on the facade. At the stage of selection of the material often there are doubts that it is better decking or metal, although if we talk about the cottage in the finish which is important for literally every little thing should prefer the second option as a more practical and aesthetically appealing. Regardless of what type of metal roof was preferred, all the works on installation are carried out in strict sequence.
- Installation of roof system sheathing.
- The additional device structures (attics, skylights etc.).
- Mount hydro – vapor barrier material.
- Laying of the layer of insulating material.
- Counter lathing.
- Installation of the eaves.
- Installation average coverage.
- Installation of elements of the drainage.
- Trim protruding elements and low tides.
Despite the relative simplicity of the work, the installation of the coating of metal is best left to professionals that will not only get a quality, durable roof, but also significantly save time.
