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Creosote

Date posted: October 22nd, 2015

creosote

Creosote is the natural by-product of burning wood, it includes tar droplets and other organic compounds. Tar droplets make up a major component of the smoke from burning wood this is why leaving a fire to slumber overnight is inadvisable. Heavy tar and creosote build up inside a chimney is putting you more at risk of a chimney fire. Tar and other vapours can condense within the interior of the appliance and it’s flue system, these deposits are usually brown/black and are called creosote.

Contributing Factors of Creosote

  • Slumbering a fire; turning all the air vents down so your fire builds up more smoke is inadvisable. In general the smokiest fires contribute to the most creosote.
  • Moisture content of fuel; not too dry or too wet, in the region of 14-20% moisture content.
  • Flue gas temperature can be affected by many factors including chimney type, size, location and construction.
  • The amount of time that smoke lingers in the chimney; the longer the time, the greater chance of creosote and tar build up.
  • To minimise the build up of creosote use dry, well seasoned wood with a suitable chimney in a suitably sized appliance for the room making sure the fuel load is correct, the air supply is met and the temperature balance does not exceed 350°C as it a my cause a chimney fire.

Reasons to remove creosote

  • Increased risk of chimney fire.
  • Creosote is acidic and corrosive and can eat into brick work and mortar lines giving you staining on the chimney breast and deterioration of the chimney itself.
  • Easier for chimney to be swept, making it less time consuming and keeps costs down.

Chimney Lining, Information on draft.

Date posted: September 24th, 2015

gill-sweeps-chimney-draft

It is the height of the chimney which will have effect on draft and not the volume of gasses within. The recommended height of a chimney is 4.5 metres.

There are many reasons why smoke can sometimes come back down the chimney, this is called ‘back syphonage’ and is affected by pressure conditions in the house.

Firstly, there must be adequate air movement in the house to make up for the air exiting through the chimney.

Do you have an air vent? If you have a stove above 5kw then you are required to have one!

An open fire demands more airflow so the same applies but the air vent needs to be correctly sized.

Secondly, there must not be too much competition from other devices in the house such as extractor fans or air exhaust systems, if something else is sucking the air out of the house, the chimney might not be able to overcome it.

And a final point would be to consider a proper chimney design, the chimney must be able to accommodate the volume and type of fumes being emitted by the appliance it serves – perhaps you need your chimney lining?

Welcome to our blog

Date posted: August 25th, 2015

Here you will find all out latest news and information about Chimney sweeping, chimney lining and repair and our work in West Yorkshire

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