From time to time it becomes necessary to climb to the surface of any roof to carry out repairs or analyze the condition of materials. This applies not only to those roofs that are in operation. Fencing is essential for the safety of people who intend to make repairs, install antennas, upgrade roofing equipment or perform surface analysis.
Fencing regulations
Fencing of roofs is made according to the rules prescribed in SNiP 21-01-97. This technology involves the installation of fences on sloping roofs, the slope of which does not exceed 12 degrees. Which is true if the height of the building is more than 10 meters. If the height exceeds 7 meters, and the slope of the pitched roof is more than 12 degrees, the fence is also necessary. Height refers to the distance from the eaves to the ground. If the work is to be carried out on production buildings, then the described structure is extended with gratings up to 60 cm. These conditions are met if there is a parapet that does not reach the mentioned height.
Fencing device
Roof fencing is a fence made of steel grating. The design kit includes support posts, 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 elements of a profile section. Washers, screws, nuts, etc. are used as fasteners. The weight of one element according to the type of beam or rack is in the range from 2 to 3 kilograms. The kit may include auxiliary elements, such as: walkways, wall and roof ladders, as well as snow retainers.
Master's 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 ensure that the integrity of the coating is not compromised. When handling flat and profile coatings, fastening screws equipped with sealing 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 railing
Roof fencing involves the use of metal profiles, crossbars,metal rods, as well as steel plates. As for the profile, its shape should be U-shaped. But the dimensions are equivalent to the dimensions of 25x40 millimeters. When choosing rods, one should prefer those that have a diameter of 16 millimeters. Metal plates should have a thickness of 1 cm. While their dimensions are equivalent to 7x10 cm. These components are used for fastening. The fencing of the roof of the building is mounted in several stages. To begin with, with the help of a grinder, two racks should be cut off, each of which will be 60 cm long. Two crossbars, each 2.5 meters long, should be prepared in the same way. Mounting holes must be drilled in the plates, their diameter should be made slightly larger than the thickness of the mounting hardware. Plates are welded to the racks at right angles. Supports are attached to the latter by welding. This must be done in such a way that these components are located 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 racks. Vertical bars are welded to the horizontal at a distance of 30 cm. On this we can assume that the section is ready.
Final works
After you have completed the section, it can be attached to the wooden crate with screws. Holes must be made in concrete using a perforator. The fence is reinforced with anchor bolts, the length of which is 16 cm. The second sectionformed from a rack. Horizontals should be welded to the end post of the section that has already been installed. The same scheme should be followed when making subsequent sections and racks.
Fencing test
If roof railings are not tested, the structure is considered unusable. These manipulations are carried out after the completion of construction and before the commissioning of the facility. 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 firms, have the right to carry out such work. Once a year, a visual inspection should be carried out.
Checklist
Testing roof railings involves analyzing the structure for compliance with dimensions. It is also important to carry out an external assessment of the structure for the quality of fastening and the integrity of the elements. Experts assess the welds and the quality of the coating. It is also important to carry out a strength test. For this, local loads are applied 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.
Cost of fences
Roof fencing, the price of which can start from 2000 rubles, can have different design features. Experts take into account the length, height, as well as the roofing material with which to work. Thus, in the presence of a seam roofing systema 3-meter fence costs from 3,500 rubles. A roof made of metal is supplied with a fence for 2000 rubles or more. If the craftsmen have to work with shingles, the cost starts from 3,000 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 railings, you will have to pay 100 rubles per linear meter.
What else you need to know about the height of the barrier
The height of the roof fencing on pitched roofs is regulated by the rules, they were described above. If there is a parapet railing on the roof, then the steel grating barrier must be reduced by its height. In some designs, the transverse beams located between the uprights are 30 cm apart. A distance of 10 cm must be maintained between the vertically oriented components. After the height of the roof fence 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, remember that the surface should not have mechanical damage, scale, or 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 them with tests, which will become a guarantee of safety during the operation of the roof. That is why even experienced home craftsmen most often use the servicesprofessionals.
