In the process of arranging roofing, various materials are used. They differ in a set of characteristics, pricing policy. One of the materials in demand today is metal. It is easy to use, practical and relatively inexpensive. Even a non-professional installer can mount a coating from this material.
In order to complete the finish correctly and efficiently, you need to learn how to choose and install the right metal for the roof. The advice of experienced builders will help you sort out this issue.
General characteristics
Metal has been used by mankind in the field of construction for many centuries. Sheets of this material are subjected to special processing. The result is a strong, durable and lightweight finish. It is for this reason that metal is often used for roofing.
Today, sheets of this material are processed in various ways. As a result, do-it-yourself metal roofing does not cause great difficulties. The sheets bend well. This allows them to be used on roofs of almost any shape.
Finishing can be done using metal corrugated board, metal tiles,rolled or sheet steel. The last two varieties have a lot of advantages. When using such materials, the finish is sealed. Sheets in this case are connected in a special way. It does not require the use of special materials.
Benefits
Any type of metal for roofing has a number of positive characteristics. First of all, it should be noted its durability. With proper processing, the finish will last for several decades. It slightly weights the structure of the building, unlike heavy ceramic tiles.
The cost of metal finishing remains consistently acceptable. This is a versatile material. It is suitable for finishing the roof of almost any type. For flat, inclined, curly structures, it is metal that is used. It can be mounted fairly quickly.
The presented material provides high rigidity of the joint with the crate. Also, the metal, when properly processed, resists adverse atmospheric influences well. It has many types, design options. The roof, finished with the presented material, looks stylish and spectacular.
Varieties
Roofing with metal is a relatively easy job. The choice of materials in this case can be any. There are sheets of various types of metal. The customer can choose both simple and noble materials.
Roofing is more expensive than other varietiesusing copper or zinc-titanium alloy. Sheets made of galvanized steel or aluminum are also characterized by high efficiency. For such materials, a special polymer coating is used. It additionally protects the metal, and also gives the surface the desired decorative effect.
Roofing is much cheaper when using tin. This material necessarily has a protective layer of aluzinc or zinc. This option is most often used when arranging the roof of a garage or outbuilding. To finish the roof of a house, it is recommended to use metals treated with a polymer substance.
Steel sheets and coils
If it is necessary to make calculations for the roof of a dome with metal, roofs of complex configuration and other objects, consider such an option as sheet or roll materials. Their thickness can be from 0.6 to 1 mm.
Sheets are produced with a width of 1 m or 1.25 m and a length of 2-3 m. They are laid apart. Adjacent sheets are shifted relative to the previous layer. In this case, the finish resembles an old roof. Installation is quite labor intensive. The number of stitches in this case will be significant.
Roll materials vary in width from 57 to 1 m. The length of the roll can reach 16 m. This material is used for large slopes that have a uniform slope. Also, this material is suitable for roofs with a steep slope. The joints in this case are connected using a special technology. In this case, installation is faster.
Profiling
Applicationcorrugated board is another popular metal roofing material. Profiles in this case belong to the carrier category. It has a special capillary groove. In addition to roofing, load-bearing corrugated board can also be used for wall decoration.
When choosing corrugated board, you must choose the right thickness of the material. If it is insufficient, the sheet will be too soft. The groove in this case may be deformed. And the roof will not efficiently remove excess moisture.
Several types of profiled sheets are used for roof finishing. Grade S-21 is characterized by sufficient rigidity. It is mounted on a crate, which has a step of up to 80 cm. Large dimensions are characterized by corrugated board of the RN-20 brand. The width of these sheets is 110 cm. It is also quite hard material.
The most durable varieties are professional sheets of category S-44 and NS-35. They have additional ribs. The material is very durable.
Mounting Features
After reviewing the information about the dimensions of the metal on a soft roof, a hard type of finish, you should consider the installation features of the presented materials.
It should be noted that sheet and roll varieties do not have high rigidity. This is a soft type of roof. Decking is more rigid. However, the installation principle for different metal finishes is similar.
The elements from which the roofing is assembled in this case are calledpaintings. To connect them together, special seams are created. They are called fakes. These seams create an airtight connection. They prevent moisture from getting inside. It is the folds that create a special pattern on the surface of the roof. Therefore, such a roof is called folded.
Base for soft roof
Sheet or rolled metal for seam roofing is mounted on a prepared base. If the roof is sheathed with soft material, a hard floor is prepared. For these purposes, a continuous crate of boards is used. In some cases, it is allowed to use a base made of chipboard or plywood. These materials must be moisture resistant. If necessary, the base is treated with special water-repellent compounds.
It is forbidden to lay metal on bitumen-based materials (roofing material). There should be a small distance between the metal and the base of the roof. This allows you to create the necessary ventilation. For these purposes, a special mat of interwoven polymer fibers is laid on the crate.
A membrane can be used for the same purposes. It is distinguished by the presence of truncated cones. The use of such materials not only contributes to the creation of ventilation, but also serves as sound insulation. The noise of rain, wind will be heard less.
Crate for corrugated board
Rigid varieties of metal for seam roofing can be mounted on a base of a slightly different type. A solid crate in this case is used only for slopes with a small angle of inclination (up to 15º). If ametal of low rigidity will be mounted, they also create ramps from a continuous crate.
If the roof slope reaches 15-30º, you can use a board spacing of about 45 cm. This will be enough to ensure sufficient strength of the system. For steeper slopes, you can increase the pitch. The crate in this case can be about 60 cm. It is very important to take into account the rigidity of the corrugated board.
For brands such as NS-35, NS-60, NS-75, the angle of inclination of the roof does not matter much. For them, you can use the crate with the widest step. In some cases, this figure reaches 3-4 m. This type of material is used in large facilities. For private construction, less rigid materials are more often used.
Combining pictures
The presented types of finishes are connected using special seams called folds. They provide a secure, waterproof joint. Therefore, the presented type of finish does not need sealants. For a metal roof, the paintings are laid out perpendicular to the eaves. They are connected using double or single folds.
The height of such seams is most often about 2.5 cm. The step between the folds is determined by the size of the paintings. Most often it is about 50-70 cm.
Pictures are also joined horizontally. Such seams run parallel to the eaves. This mounting option is suitable for long slopes that cannot be covered with a single layer of metal sheets. Such joints are performed by the lying fold method. It makes the joints less visible.
Extremely rare mounting picturesperformed using nails, screws or screws. In this case, the metal has to be drilled. The material cannot freely expand and contract with temperature fluctuations. It's also not a tight enough connection.
Varieties of fold
Metal for seam roofing can be connected in various ways. Seams differ in configuration. Standing folds are recommended to be double. In this case, a strong, reliable connection is obtained. Such seams are used for roofs with a slope of up to 25º. For areas with frequent heavy snowfalls, a high rebate is recommended.
In some cases, if there is water on the roof for a long time, special gaskets can be used to seal the seam.
Standing seam type connects sheets of metal with the help of special clamps. They are installed between metal paintings. With their help, you can make longitudinal seams.
If the angle of inclination of the slopes exceeds 25º, you need to connect the pictures with a corner fold. It resembles the letter "G" in its configuration.
Metal plating
Roof roofing metal must be of high quality. Therefore, it is important to pay attention to its finish. Metal is most often treated with various polyurethane materials. The most popular are roofing sheets treated with polyester, pural and PVDF.
Polyester belongs to the category of the cheapest materials. This layer looks aesthetically pleasing. However, it is inferior in strength to other varieties.
Pural is made on the basis of polyurethane. It has a highercost. But the roof, covered with the presented material, is less susceptible to mechanical stress, chemicals. This is a durable, durable type of finish.
Polyvinyl difluoride (PVDTF) is the most durable, strong type of coating. This is the most expensive finishing option for metal sheets.
What to look for when choosing?
Roofing metal can differ significantly in a number of characteristics. For each type of roof, it is necessary to choose the right finishing material. At the same time, the slope of the slopes, the features of the climatic zone, the configuration of the structure and other nuances must be taken into account.
When choosing, it is important to pay attention to the thickness of the sheets and the type of their coating. Before purchasing materials, you need to make a calculation. You can order the necessary metal paintings directly from the manufacturer. In this case, their dimensions will optimally match the existing conditions.
Don't buy products that cost less than market prices. In this case, the roof will not be strong enough. After a short time, the work will need to be redone. This will require additional costs. To avoid this, you need to purchase products from trusted manufacturers. When buying, you need to require certificates for the presented metal sheets.
Recommendations from experts
When buying, it is important to pay attention to a number of issues. Experts advise visually inspecting the metal. It must be of sufficient thickness. Too thin varieties are not suitable for arranging the roof. The material will be constantly exposedvarious adverse effects. Therefore, its strength must be high.
Need to look at the outside. It should not have defects, rust, peeling of the coating. It is also important to pay attention to the inside of the sheet. It must be uniform in color. There should be no streaks on the metal. The coating should be uniform in color over the entire area of the material.
Having considered the features of the metal for the roof, you can choose the best option for each type of construction.
