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DEHN Africa provides lightning protection components for thatched roofs

27th February 2017

     

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DEHN  (0.04 MB)

It’s a reality that thatched roofs are extremely popular in South Africa, both within many rural communities and a number of upmarket developments. Constructed of soft material, such as straw, reed, grass or coconut leaves, a thatched roof is more susceptible to catching alight as a result of a lightning strike than any other roof type, according to the South African National Standard (SANS). Thatch is particularly prone to ignition because it becomes “fluffy” at the surface and, if moist, methane and other flammable gases can be formed.

If recommended protective measures are not considered, the effects of lightning can cause serious damage. However, prior to providing these protective measures, it is important to analyse the risk effects described in standards guide, such as SABS 0313: 1999, SABS IEC 61662-1: 1995 and IEC 62305-2.

When a thatch roof is constructed, wire mesh is used to reinforce and secure the bundles of thatch. Should lightning strike, then current flows through the wire mesh and the thermal effect (generated heat) may occur, and set the roof alight.

DEHN Africa, an expert in surge and lightning protection, can assist homeowners in avoiding lightning related disasters – and ultimately extend the life span of these structures - through the provision of lightning protection system (LPS) components for use specifically on thatched roofs.

More importantly, it can also provide the protection needed to avoid any injuries (or loss of life) related to a lightning strike for the people living and working in thatched roofed structures. DEHN Africa has recently introduced new methods of protecting thatched roofed structures in South Africa, and it is no longer necessary to have a ≥30 meter long mast installed.  The latest preferred external protection system for installation on thatched buildings is the high-voltage-resistant insulated (HVI) lightning protection system that is compact, neat and approved by leading insurance companies and SANS.

For protection measures to be successful, air-termination conductors on thatched roofs must be installed as elevated traverses, for example: on isolating supports, with certain distances also to be kept for the eaves. LPSes should be designed to provide sufficient low impedance so that the lightning energy can follow in the required route. This requires an integrated design and effective use of material with enough low impedance. For protection measures to be successful, air-termination conductors on thatched roofs must be installed as elevated traverses, for example: on isolating supports, with certain distances also to be kept for the eaves.

The market leader DEHN, a globally active family-owned electrotechnical company with more than 1700 employees worldwide, offers innovative products and solutions as well as comprehensive services in the field of surge protection, lightning protection and safety equipment. DEHN focuses on the protection of system and building technology, the transportation, telecommunication and process sector, photovoltaic systems, wind turbines, etc. The company's continuous growth is based on more than 100 years of tradition and experience as well as highest quality standards and consistent customer and market orientation throughout the world.

Edited by Creamer Media Reporter

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