From time to time there is a need to climb the surface of any roof for repairs or analysis of the condition of materials. This applies not only to those roofs that are operated. In order to protect people who intend to carry out repairs, install antennas, update roofing equipment or analyze the condition of the surface, a fence is necessary.
Fencing regulations
Roofing is made according to the rules prescribed in SNiP 21-01-97. This technology involves the installation of fences on gently sloping roofs, the slope of which does not exceed 12 degrees. What is true if the height of the building is more than 10 meters. If the height exceeds 7 meters, and the angle of inclination of the pitched roof is more than 12 degrees, a fence is also necessary. Height provides the distance from the cornice to the surface of the earth. If the work is to be carried out on production buildings, then the described construction is expanded with lattices up to 60 cm. These conditions are met in the presence of a parapet that does not reach the mentioned height.
Fencing device
The roof fence is a fence made of steel grating. The construction kit includes support racks, which are most often made of metal pipes. Among other things, it is worth highlighting the cross beams, brackets and fasteners. The first component is round pipes or profile section elements. Washers, screws, nuts, etc. are used as fasteners. The weight of one element by the type of beam or rack is in the range from 2 to 3 kilograms. The kit may include auxiliary elements, such as: transitional bridges, wall and roof stairs, as well as snow retention.
Wizard recommendation
Roof fencing involves the installation of separate sections that are assembled on the ground or on the roof. Such manipulations should be carried out after mounting the racks.
Mounting options
If you have to work with a seam roof, the racks should be installed by fixing pipes with clamps. This will eliminate the violation of the tightness of the coating. When handling flat and profile coatings, fixing screws that are equipped with gaskets should be used. In the presence of roofs, the slope of which varies from 15 to 45 degrees, the fasteners can be hinged.
Features of installing a roof fence
Roof fencing involves the use of a metal profile, crossbars, metal rods, as well as steel plates. As for the profile, its shape should be p-shaped. But the dimensions are equivalent to the size of 25x40 millimeters. When choosing rods, you should prefer those that have a diameter of 16 millimeters. Metal plates should have a thickness of 1 cm. Whereas their dimensions are equivalent to 7x10 cm. These components are used for fastening. The roof guard of the building is mounted in several stages. To begin with, with the help of a grinder, two racks should be cut, each of which will be 60 cm long. Two crossbars with a length of 2.5 meters each should be prepared in the same way. Mounting holes should be drilled in the plates, their diameter should be slightly larger than the thickness of the fastening hardware. At right angles to the racks are welded plates. They are attached to the latter by welding the backup. This must be done in such a way that these components are positioned at an angle of 30 degrees. The upper cross member is welded to the uprights. The second crossbar is fixed at a distance of half a meter from the first. 10 cm should be retreated from the lower ends of the uprights. Vertical rods are welded to the horizontal at a distance of 30 cm. At this, we can assume that the section is ready.
Final work
After you have completed the section, it can be attached to the wooden crate with screws. Holes must be drilled in concrete using a hammer drill. The fence is strengthened by anchor bolts, the length of which is 16 cm. The second section is formed from the rack. The horizontal lines should be welded to the extreme rack of the section that has already been installed. The same pattern should be followed when making subsequent sections and racks.
Fencing Test
If the roof fencing is not tested, then the design is considered unsuitable for use. These manipulations are carried out after the completion of construction and before the commissioning of the object. During operation, tests are carried out regularly, while it is important to adhere to an interval of 5 years. Employees of the department, as well as certified companies, are entitled to carry out such work. Once a year, a visual inspection is required.
Test list
Testing roof fencing involves the analysis of the design for size. It is important to carry out an external design assessment on the quality of fastening and the integrity of the elements. Specialists evaluate welds and coating quality. It is important to carry out a strength test. For this, local loads are exposed to the structure for 2 minutes at a distance of 10 meters along the perimeter of the roof. The load should be equal to 0.54 kN. The result can be considered satisfactory only if the structure is not deformed.
The cost of fencing
Roof fencing, the price of which can start from 2000 rubles, can have different design features. Specialists take into account the length, height, and also the material of the roof with which to work. Thus, in the presence of a fold system of the roof, a fence of 3 meters costs from 3,500 rubles. The roof of the metal is equipped with a fence for 2000 rubles or more. If the masters have to work with shingles, the cost starts from 3000 rubles. Thus, the price per linear meter is 600 rubles. The maximum cost is 1000 rubles. If there is a need to test the roof fencing, you will have to pay 100 rubles per linear meter.
What else you need to know about barrier height
The height of the roof fencing on pitched roofs is regulated by the rules, they were described above. If there is a parapet fence on the roof, then the lattice steel barrier should be reduced by its height. In some designs, the transverse crossbars located between the uprights are 30 cm apart. A distance of 10 cm must be maintained between vertically oriented components. Once the height of the roof guard has been determined, it is important to choose a material that can be metal, plexiglass or metal frame. In the first case, you get a solid screen.
Conclusion
When installing the fence, it should be remembered that the surface should not have mechanical damage, scale, and dents. Assembly work should be carried out using a welding machine. Most often, such manipulations are carried out by specialists. Only they will be able to carry out all the work, completing their tests, which will guarantee safety during the operation of the roof. That is why even experienced home craftsmen most often use the services of professionals.