Profiled sheeting is considered one of the most affordable, durable and practical materials for roofing. It is a metal sheet coated with a protective layer. Next, the sheet is passed through a special molding machine. As a result, grooves and protrusions form on it. This is necessary for the product to be rigid. Decking is lightweight. Installation of a corrugated roof can be done independently without outside help.
Types of materials
In building supermarkets there are several types of profile sheet. Produce ordinary galvanized material. There are also colored counterparts. So, another protective layer based on polymers is applied over the zinc layer. This coating has a protective function and also gives the material a more attractive appearance.
Galvanized profile sheets are often used in roofing work on temporary buildings. If an old garage is leaking, it is really possible to cover the roof with corrugated board of this type. Colorthe option is used on the roofs of residential buildings.
Types of material by purpose
It is made from sheets of various thicknesses. The thinnest are designed for mounting on walls, but a corrugated roof (the photo is presented in this material) is also performed. However, partial or full battens and minor snow loads are required. A thin sheet will not withstand large loads. These sheets are most often marked as follows - “C”.
The thickest corrugated board is characterized by increased bearing capacity. It is marked as follows - "H". It is mainly roofing material. Most often, it is purchased for the installation of a corrugated roof in areas where there are increased wind and snow loads. More universal is designated as "NS". It is used for arranging walls, as well as roofing.
After the letters in the marking of profile sheets there are numbers. Manufacturers indicate the height of the wave with numbers - it is indicated in millimeters. Which roof decking to choose? Roofing is usually used, where the wave height is not less than 20 millimeters.
As for the shape, the supporting metal profile has a more complex wave. Additional elements have been added to it in order to increase rigidity.
Profiling by type of protective coating
Despite the fact that the sheets are similar to each other, their cost can vary significantly. The thing is that various materials and technologies are used in the production. For example, it has already been noted above that the protective coating can be zinc or zinc with the addition of aluminum. Second optionthey began to offer relatively recently - equipment for production is quite expensive. However, the durability of the product is much higher due to the properties of the aluminum-zinc coating.
The durability is also affected by the method by which the manufacturer formed the wave of the profiled sheet. Two popular technologies are currently being used. These are cold rolling, as well as rolling with emulsion. In the first case, sheets without any preliminary preparation are pressed through by rotating metal rollers. In order not to damage the protective layer in the process, more expensive machines are used. Therefore, cold-rolled profiled sheet will cost more.
In the process of forming a wave during rolling using an emulsion, the metal surface is first wetted. It can be oil, water or other special liquids. Only after the surface has been carefully processed, the sheet is sent under the rolling rolls. Then it is dried. If you do not dry after rolling, then wet areas will quickly rust. It is physically impossible to notice these defects in advance - one can only hope that the manufacturer has not violated the technology during the production process. As for the final cost, it is cheaper than cold rolled sheet.
Types of polymer coatings
Polymeric protective coatings are also different. This layer is a protective film of different density and thickness. The properties are different depending on the species.
The corrugated board is covered with polyester. Coating canbe both glossy and matte. The price of the sheet is relatively low - this is the cheapest product from the entire range of colored profile sheets. Characteristics, despite the affordable prices, he has good. The polyester coating is plastic enough, does not fade in the sun and does not change color. The matte finish does not glare in the sun, and the appearance is velvety. Manufacturers achieve this with other application technologies and thicker layers. Matte polyester coating is the most reliable and resistant to various kinds of mechanical stress.
Plastisol is also used. This polymeric material is characterized by increased resistance to aggressive environments and impacts, but is practically not protected from ultraviolet exposure. A plastisol-coated corrugated roof will lose color vibrancy within two to three years.
Pural. PVDF
This is a polyurethane with the addition of polyamides and acrylics. The result is a homogeneous coating with a long service life. In order for the color to change, at least ten years must pass. The downside is the very high price of such a profiled sheet.
This is a polymer coating based on polyvinyl fluoride with the addition of acrylic. This coating is also quite expensive, but the service life is very high even under constant exposure to an aggressive environment. One of the characteristics is self-cleaning. A little rain is all it takes to make a corrugated roof shine like new.
What to choose?
Under normal conditions, the roof is equipped with materials with a polyester coating. This is the optimal solution with a good ratioquality and price.
Roof construction made of corrugated board, except for the profile sheet itself, is a whole complex of various structural elements. These are heat-insulating materials, vapor barrier, ventilation. Each of the elements performs an important function, ensuring the correct functionality of the coating. In order for the roof to serve for a long time, it is important to correctly position all the layers of the roofing cake.
The task of a vapor barrier is to prevent moisture from entering the insulation materials. To do this, use the film. They are laid inside the roof. Fastening is carried out using a stapler. The seams are glued with adhesive tape or special butyl tape.
The next layer should be insulation materials. Insulation is used to compensate for temperature changes. This will prevent the accumulation of condensate during the operation of the room. The thickness of the insulation is selected depending on the region. Experts recommend using a 200 mm thick insulation for high efficiency. Insulating material in slabs or a roll is placed between the load-bearing elements of the roof.
At the final stage, the installation of waterproofing membranes is performed. They act as an additional insulation, and due to their water resistance, they protect against condensate, extending the life of the roofing system. The membranes are rolled out horizontally. They are overlapped, every 150 millimeters.
How to lay corrugated board on the roof?
The roof is laid on a pre-created crate. Fragments of it should be parallel to the overhang. step betweenbatten boards should be up to 60 centimeters. It is made smaller, the smaller the slope of the roof. So, for a slope of 15 degrees or less, the crate step will be 300 millimeters.
For the manufacture of roof lathing for corrugated board, an inch board, cut off, is used. The sheets are placed one after the other. In this case, a vertical overlap of one wave with another is performed. In the process of laying, pay attention to the fact that the extreme shelves can have different lengths. The shorter shelf should be at the bottom, and the long one should cover the short one. Why is that? Everything is simple. In this case, the two profile sheets adjoin each other very well. There are no gaps. If mixed up, a gap will form, into which water will fall.
Covering the roof with corrugated board always starts from the bottom up. Moisture will not be able to get between the sheets. Wavy material is laid against the direction of the wind. If the wind blows from the right more often, then the installation is performed from the left to the right side.
If the length allows, it is better to use a whole sheet. Then laying starts from the end of the roof. Align along the cornice and do not forget about 40 millimeters to the light. Some, in the process of covering the roof with corrugated board, forget about it and align the sheet along the edge - this is unacceptable.
Calculations
Before you start calculating the amount of required profiled sheet, make measurements of the roof. Measure the slopes diagonally and compare these values. The discrepancy should not be more than 20 centimeters. They also check the slopes for the level of the plane - this is done with a cord and a level. For everyfive meters, the deviation should be no more than five millimeters. Otherwise, the professional sheet will not join.
To calculate the number of sheets, measure the length of the eaves and divide by the installation width, taking into account the overlap. You can perform the calculation in another way. So, the length of the cornice is divided by the useful width of the sheet and the value is rounded up.
If you need to cover the roof of a complex shape with corrugated board, then the structure is divided into figures. Each shape is calculated, and everything is summed up to get the final result.
Pro Tips
The profiled sheet is lifted with the help of logs made from several boards. Do not work in windy conditions. In the process of work, you should walk on the sheets only in soft shoes. You can only step into the troughs between the waves. To avoid corrosion in the future, all sections are treated with repair enamels.
Use protective gloves when working - the edges of the material are very sharp. Debris that will definitely accumulate in the process is swept away with a brush. The protective film is removed immediately after installation is completed.
Tools
For cutting the sheet use lever or electric scissors, for fastening - a hammer or a screwdriver. To fix the insulation and vapor barrier, you will need a construction stapler. Also, if the profiled sheet will be mounted on a pipe, you will need a drill and drill No. 5.
How to properly fix the profiled sheet?
Fix the corrugated board to the roof with self-tapping screws. These are special elements that have a rubber gasket under the cap. This ensures tightness. Theseelements are often painted in the color of the profiled sheet. The number of self-tapping screws per square meter is about five to seven pieces. At the same time, one must not forget that 20 percent of the self-tapping screws will additionally be used for the installation of the ridge element, for fixing joints and other work.
Screws are mounted in the lower shelf in the place where the sheet touches the crate. The thickness of the fastener is 20-25 millimeters and depends on the thickness of the board. It is important that the end does not protrude from the back of the board.
Two adjacent sheets are also fixed with self-tapping screws when connected. But here the fasteners are screwed into the wave. Longer variants are used.
Installation order
When the rafter system is ready, the front board is nailed to it. Hooks are attached to the board, on which a water drain system will then be installed. A special bar is installed over the board.
The pie of materials will be different depending on the tasks. If the attic is cold, this is one complex, if it is warm, then another.
For a cold attic, the scheme will be something like this. A vapor barrier membrane is nailed on top of the rafter boards. You need to fasten with a slight sag. You need to lay it from below, consistently moving up. One canvas should go to the second by 15 centimeters. The joints are glued with tape.
Next, they nail the crate. At the top, two boards are installed on both sides of the ridge. In the place where the overhang is formed, two or three boards are nailed. Attached to the framecorrugated board.
For insulated roofing (corrugated roofing), the order is slightly different. There will be more layers here. From the inside, a crate is nailed to the rafters. Its task is to keep the insulation. A membrane is attached to the crate. Insulation is laid from the side of the roof. A membrane or film for waterproofing is attached on top of it. The membrane should sag, but not touch the insulation. Then they make a crate, and all that remains is to cover the lid with corrugated board.
Methods of laying material
First put a sheet from the bottom of the roof, and then put the next one on top of it. Next, put the second in the bottom row, on which then another. After that, the same construction is obtained from the other end. A shed roof made of corrugated board is done just like that. The method is relevant if the sheets have a deep drainage groove.
Another method involves three sheets. Two are located at the bottom, and one is at the top. The edges are aligned along the eaves. When this design is fixed, the remaining sheets are screwed on top. This method of covering the roof with corrugated board is convenient when there is no drainage groove. Sheets stacked from below are covered by those stacked from above.
Installation and sealing of the ridge
The space under the profile sheet must be ventilated. The steel surface quickly heats up and cools down, which will contribute to the formation of condensate. In the upper part, the sheets do not fit closely, but a small gap remains.
To solve this problem, special ventilated skates are offered. But ifjust put a regular ridge element, then the holes are enough. The higher the wave, the larger the ventilation gap will be. Sometimes it gets clogged and ventilation deteriorates.
You can solve this problem if you use a special sealant during the installation of a corrugated roof with your own hands. This material is made of foamed polyurethane or polyethylene. The material is porous - it passes air well. The shape of the seal repeats the shape of the profile sheet. It is glued to sealants, double-sided tape or glue.
Pipe passage
There are a lot of questions about this. For a round pipe on a corrugated roof, special aprons made of steel or polymeric materials are used. The top is cone shaped. The bottom is elastic. It can take any form. This product is put on the pipe so that the elastic part lies on the roof. Next, the skirt is shaped into a profile sheet. To prevent water from flowing under the elastic part, it is smeared with sealants.
Next fix the main plane. In the case of the upper part made of metal, it is enough to clasp it with a clamp and tighten it, and grease the joint with sealant. If the apron is polymer, it is put on with a decent effort.
Conclusion
How to cover the roof with corrugated board with your own hands? With the proper ability to work with metal and wood, even beginners will succeed. Efficiency is very high - the design is much better than any soft roofs.
