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Thatched roofs - chimneys and electronics

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Around 90% of thatch fires relate to chimneys and the use of wood burning stoves involving heat transfer. Modern enclosed solid fuel appliances are designed to burn efficiently and cleanly. Connecting these to old chimneys, where there is only a four inch thickness of brick, makes the thatch especially vulnerable to the risk of heat buildup between the brick and the thatch.

The danger zone for heat transfer and thatch ignition, which is shown in red in the diagram, is associated with older and/or listed properties and usually relates to at least two of these:

  • A deep multi-layer wheat straw thatch where the thatch is over one metre deep – a guide to the depth of thatch can be assessed in relation to the level of visible chimney.
  • Regular use of a multi-fuel or wood burning stove with an inappropriate flue liner.
  • Central chimney surrounded by thatch or a house that is part of a terrace. (A blocked or tarry spark arrestor will increase the risk associated with the points above.)
  • When installing a stove or chimney lining employ a professional with experience of thatched properties. Poor installation of a stove or chimney lining will increase the risk of fire.

Old and inappropriate flue liners

Many fires result from an old and inappropriate flue liner. We recommend that you contact a professional installer to review your flue liner to ensure it is adequate for the type of fire or appliance that you are using. There are a number of different types and we recommend that you consider one of the following:

  • A lining made of pumice, clay, ceramic or concrete; or
  • A twin walled rigid system – a steel inner and outer lining filled with rockwool; or
  • A steel outer and ceramic inner lining filled with insulated rockwool.

A liner of one of these types will greatly reduce the risk of transfer of heat through the brick work to the thatch.

Electrics

  • An electrician should check electrical wires in the roof space at least once every 10 years.
  • Your electricity provider may conduct a free visual check for you. We recommend that all cabling in the roof space comply with BS6027 Part 1 – “wiring systems using mineral insulated cable”.
  • Minimise any roof space electrical wiring next to thatch. Consider putting electric lights at floor level away from the thatch using bulk head fittings.
  • External security lighting should be at least one metre away from any part of the thatched roof. The heat generated from halogen lights is sufficient to cause combustion in the thatch. Isolate external lights when carrying out maintenance to the roof.
  • Ensure the incoming power supply is over a metre from the perimeter of the thatch or sheath protected accordingly.
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