types and types of protection, methods of fastening

The owner should take care of protecting a private house from fire during lightning discharges even during the construction phase of the building. The article describes what a lightning-receiving grid on the roof is and how it allows you to protect the house from fires caused by celestial electricity. You will get acquainted with the device, the principle of operation and the stages of the installation of the interception rod - this will allow you to understand what is being done and when it is calculated and installed.

types and types of protection, methods of fastening

Installation of an interception rotor on the roof ensures safety during thunderstorms destructive elements of nature allows you to save life, health and property from the negative effects of climatic and physical phenomena.

Lightning is accompanied by an electric spark discharge in the atmosphere, usually during a thunderstorm, and manifests itself as a bright flash of light, followed by a roll of thunder. Indicators of current, voltage and temperature in the lightning channel reach catastrophic values.

A strike can be fatal or cause more or less damage to health, and property can burn. People have learned to prevent such fires by installing a lightning protection grid that absorbs a charge of electricity from the atmosphere and diverts it in a safe direction.

Functional features and radius of action were the basis for dividing the considered devices into two types. There are the following types of lightning protection:

  1. Active system , characterized by an increased radius of action. Such a device is able to protect not only the house, but also the outbuildings located in the courtyard.

  2. Passive system, the principle of which is to ground the electric discharge. Structurally, it is identical to the first species, differing only in its limited action.

types and types of protection, methods of fastening

A lightning protection system on a building with a grounding electrical discharge of lightning

Typically, these systems are installed on the building at the end construction. The absence of a lightning protection device is a reason to require the contractor to perform a full range of services to ensure the safety of the structure.

Design Features

A long-standing metal rod-shaped lightning rod has not been able to provide decent protection for a flat-roofed building. The special lightning protection grid on the roof in this case is an excellent alternative to the vertical receiver.

According to the installation method, such devices are divided into two groups:

  • The grid is mounted directly onto the concrete foundation of the roof during the construction phase. Layers of insulation, waterproofing and roofing are installed over lightning protection. Prerequisite is the incombustibility of materials.

  • In buildings in the private sector, the most common option is external fastening an interception grid. Special holders are used for reliable fixation of structural elements.

types and types of protection, methods of fastening

The fastening structure of the lightning receiving grid must be securely fixed by holders, and all materials are absolutely non-flammable (if possible)

The device of mesh lightning protection is not particularly complex. Its design is represented by the following functional parts:

  • Steel wire , distributed with a certain pitch over the surface of the roof, constitutes a system of conductors. It is she who has the thunderbolt.

  • Current drain , designed to connect the grid to ground. It is made of reinforcement bars. It is allowed to use metal drain pipes as a current lead.

  • The grounding device is represented by a linear or closed loop. The vertical rods connected with a bar or stripe are buried 0.5 m below the ground. To determine the length of the rods and the distance between them, the calculation method is used.

All elements of the lightning receiving grid have an equivalent value, making a single structure. The difference in the component parts is determined by the type of roofing system and the structural features of the building itself.

types and types of protection, methods of fastening

The type of roof and building determines the choice of the appropriate construction of an interception grid device
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Main stages of installation of an interception network

Consider the second option to protect structures against natural electricity, represented by an external method of attaching structural elements on top of roofing materials.In this case, the mesh system is the most efficient, featuring high reliability.

Mounting technology can be represented by the step-by-step implementation of the following actions:

  1. Steel bars are evenly distributed , forming a grid. The distance between the elements is determined by the category of lightning protection. The maximum permissible step size is characterized by a 6x6 m indicator.

  2. Creating a complete mesh system is performed by bolting or welding. The advantage of using bolts is to prevent damage to the zinc sheath of steel rods, which helps protect the material from corrosion.

  3. Ensuring galvanic connection of conductive parts with a grid allows to achieve maximum efficiency of the lightning protection device. Additional receivers equipping areas that do not conduct electricity, increase the functionality of the lightning rod.

types and types of protection, methods of fastening

Installing additional interception rods at the site increases the functionality and efficiency of the lightning conductor.

There is a difference that distinguishes the light-receiving grid. on the roof for certain types of bases. It depends on the flammability of the coating material.

Lightning protection of a fireproof base

In a private building, fireproof bases made of concrete or metal sheeting are the most common. The method of fastening the lightning receiving grid on the roof is determined depending on the material used:

  • Steel bars are fixed on the metal roof by welding method . Often the net is bolted.

  • Lightning protection of concrete roofing systems is mounted using special holders . Such supports are designed to improve the reliability of fixing elements. Ensuring the stability of the holders contributes to their filling with a concrete mixture weighing up to 17 kg.

Gravity supports produce two types:

  • hollow , filled manually with concrete during the installation;

  • with a load , represented by round or rectangular elements weighing about 1 kg.

types and types of protection, methods of fastening

Fixing the structure of the inlet grid on a flat roof should be stable and reliable

Holders of an inlet network on a flat the roof is fixed at a distance of 1-2 meters. The stability of the structure is inversely proportional to the step size between the supports.

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Grid on combustible coatings

Of course, in construction, highly flammable materials are not used. Combustible bases are called coatings of low-combustible type from the category of soft roofs. These include bitumen-polymer materials used for waterproofing the roof.

An interception grid is fixed on the combustible base with a special remote holder. It is designed to create an air gap between the roof covering and steel bars of the protective structure. The created distance allows you to extinguish the spark caused by a lightning discharge.

Insulating gaps are created using vertical rods secured with plastic supports with concrete weighting. For fixing the wires use special bushings.

types and types of protection, methods of fastening

A lightning-receiving grid on a combustible roof (low-combustible type) is mounted with the creation of an air gap to extinguish a spark from a lightning discharge


Designed to connect elements of a mesh construction with grounding. State standards regulate certain rules for the installation of electrical wiring.

Connecting a lightning-receiving device to the ground loop requires the following conditions:

  • to attach to a flammable coating distance brackets ;

  • areas of connection with the receiver and grounding should have a minimum distance ;

  • the formation of loops during the laying of ;

  • it is recommended to place the current lead in areas with the least probability of human presence.

More details about the installation of the interception receiver will tell the video:

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When ordering the services of a construction company to install a lightning protection device on the roof of a private house, it is necessary to orient in installation features for different types of coatings.This will ensure the safety of property from lightning discharges with minimal material costs.

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