Fixing of corrugated board with self-tapping screws on the roof: correct technology and features
The meaning of self-tapping screws for roofing ofProfiled sheeting is difficult to overestimate. To date, this fastener is a well thought-out element, which is adapted to all the nuances of this kind of work. This kind of metalware should be properly selected. Only in this way you will be able to achieve a positive result. As a material for the manufacture of self-tapping screws, carbon steel grade C1022 is used. Fasteners are manufactured according to state standards. According to them, the surface of the screw must have a zinc coating, so that the product has anti-corrosion properties.
Reliability of fasteners
It should be borne in mind that the fixing of the corrugated board inconnection places can undergo high loads. This should include snow, wind and operational impact. That's why every batch of screws is being tested for tearing. The optimal value is 102 kg / cm. But on sale it is possible to meet self-tapping screws, in which this parameter varies in higher limits: from 150 to 170 kg / cm.
Selection of self-tapping screws for corrugated board
If you plan to mountcorrugated board with self-tapping screws on the roof, it is important to correctly select these elements. They can be designed for installation on a wooden or metal frame. In the first case, the fastening should be selected taking into account the rare thread pitch. It will guarantee the convenience of work and the strength of the fasteners. This belief is true, even if it is necessary to work with the hardest types of wood.
If the profiled sheet is installed onmetal structure, which is subjected to increased wind loads in the process of operation, it is necessary to choose self-tapping screws having a special grinding and drilling tip. The basis of these products should be high-quality steel. When arranging the roof, additional and skate elements are to be installed. In this case, you need to purchase a longer self-cutter.
Why else should I choose a screwdriver?
All three types provide for a specialtip in the form of a drill. Thanks to him in the roofing material is not required to make holes in advance. But the heads in the form of hexagons allow to fix the element in the socket of a screwdriver or a drill. This simplifies the workflow and reduces the time consuming, positively affecting the quality of installation.
Determination of the number of self-tapping screws per sheet of corrugated board
If you will make a corrugated boardscrews on the roof, then it is necessary to start the work from the side of the eaves. The first sheet fits into the bottom row. And the second is mounted with an overlap in one wave. After the canvas is leveled along the edge of the cornice, the profile is fixed to the lower beam bar in each wave. In the place of overlap, the canvas should be connected. This is done with the help of rivets. After installing the first two lower overlapping sheets, whose width is 200 mm, you can proceed to the installation of the left in the second row. But that is not all.
In the place of overlapping, the sheets must be fixed todoom in every wave. In the interval, the cloths are fixed in staggered order. Install the fasteners in two waves. For a secure fixation, the distance between the screws should not exceed 500 mm. The above technology determines how many parts will be needed per sheet. Proceeding from this, it is necessary to perform the calculation. If you are using a sheet 8 m long and 1.1 m wide, and the distance between the fasteners is 500 mm, you need to spend 10 self-tapping screws for the profile in the lower and upper parts. Eight pieces will be needed to fix the middle part of the sheet. From this we can conclude that the consumption of fasteners on the profiled sheet will be 18 pieces. This figure should be multiplied by the number of sheets on the roof. This will allow you to get the number of screws that will be needed to fasten the sheets. Everything, as you can see, is simple.
When the corrugated board is fixedscrews on the roof, the number of elements can vary. This will depend on the width and length of the sheet. If it is a question of impressive slopes, the distance between the position of the screws should be reduced. This will increase the flow by 1 m2. When fixing the material, the most attentionit is recommended to give the joints of the coating. It is in these locations that leaks are likely. At the ends, in those places where there are gable eaves, the sheet should be strengthened to each bar of the trolley. This will also increase the number of screws. Therefore, after making the calculations, you need to purchase fasteners by 10% more, since there is a possibility of marriage and unforeseen expenses, as well as breakage of parts and their loss.
Correct fastening technology
Fixing the corrugated board with self-tapping screws on the roof shouldto be conducted by a certain method. It provides for the use of colored or galvanized elements with polypropylene washers. The diameter can vary from 0.48 to 0.63 cm. While the length usually varies from 1.9 to 25 cm. It is important to consider when buying a screw that the threaded part must be longer than the width of the materials to be joined by 3 mm.
Average consumption per square meter of coverageUsually it is about 7 pieces. For the reliable fixing of the profiled sheet on the straight section, an average of 8 parts is required, whereas closer to the ends the quantity should be increased so that the structure can withstand wind loads. Screw the screws is strictly perpendicular. At the same time, distortions are absolutely unacceptable. Specialists recommend screwing the fasteners in the waves that are adjacent to the crate or purlins. When fixing the corrugated board with self-tapping screws on the roof, it is recommended to consider the photo in advance. This will allow you to understand that at the first stage the material unfolds in a strict position and order. It is important to provide an overlap, which should be greater with a smaller inclined angle.
Important nuances
If you will be mountingProfiled sheeting on the roof, the distance between the screws should be taken into account. It was discussed above. But technology provides for compliance with many more rules. Among them, it should be emphasized the need to control the force when twisting the fasteners manually. Otherwise, the coating may be damaged. If you do not tighten the screw, the roof will not perform its functions. Laying sheets of corrugated board, it is necessary to gradually move upward. In this case, the first-row linen should hang over the edge of the roof by 5 cm. This will protect the building walls from rain and melt water.
Recommendations of a specialist
Quite often, the master craftsman himselfThey fix the corrugated board with self-tapping screws on the roof. Instruction will help even those who have already been engaged in similar work for some time. From it you can find out that the sheet installation is carried out with fasteners with rubber gaskets. They ensure watertightness and absolute tightness. Steel clamps for joints are also used. But aluminum is recommended to be abandoned. After all, they can not ensure the strength of the installation at the proper level.
In order to fasten the sheets together, do notit is recommended to use welding. After all, at high temperatures, the polymer and zinc protective coating will burn out. The sheet itself after this remains without protection from corrosion. Mounting corrugated board with 21 self-tapping screws on the roof is the right decision. Nails are strictly not recommended.
Restrictions
If you want to work with a roof, the angle of inclinationwhich is greater, then the lap band should be wider. This is worth considering. If we are talking about the roof, the angle of inclination of which exceeds 10 degrees, then there will be enough overlap in one wave. There is another option. If the angle of inclination is even greater, then it is necessary to make an overlap, the width of which is two or three waves. Start moving when mounting is necessary from the end parts, and not from the middle. Important is not only the step of fixing the corrugated board with self-tapping screws on the roof, which was discussed above, but also the correctness of the layout of the sheets. They should go along the roof. Even a slight slope is not welcome. To control the location of elements on the surface, you can pull the thread, adhering to the laying line in the first row of corrugated board.
Conclusion
It is considered the most optimal described aboveway of fixing the corrugated board. A gable roof, the number of screws for which you can calculate using the technique used in the article, will look attractive if you do everything by the rules. The use of this type of fasteners can not be called accidental. This mechanism makes it possible to guarantee the maximum reliability of joining the material to the crate. Among other things, the screws have special gaskets that prevent moisture from getting inside. They also make the connection softer. Correct fixing of the corrugated board on the roof with self-tapping screws allows to exclude damage to the sheet.
