Chimney breast

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A brick chimney breast Chimney Breast.jpg
A brick chimney breast

A chimney breast is a portion of a chimney which projects forward from a wall to accommodate a fireplace. [1] Typically on the ground floor of a structure, the masonry extends upwards, containing a flue which carries smoke out of the building through a chimney stack. [2] Chimney jambs similarly project from the wall, but they do so on either side of the fireplace and serve to support the chimney breast. [3] The interior of a chimney breast is commonly filled with brickwork or concrete. [4]

Contents

The construction and appearance of a chimney breast can vary according to function and style. English and American builders more often treat the chimney breast and fireplace as distinct architectural features, whereas French buildings have gradually trended towards concealed construction. [5]

False chimney breasts

False chimney breasts are sometimes constructed around a twin-walled flue or against a wall pierced by a flue for purely cosmetic purposes. Typically they will consist of a timber frame or stud work covered with plaster board and a plaster skim. If the false breast contains a flue, it may be necessary to line it with a refractory material such as vermiculite. Usually, additional cosmetic features will be added, such as cosmetic beams, overmantels or fireplace surrounds.

Removal

Chimney breasts often become redundant with respect to their function as a chimney after the installation of alternative heating methods, such as central heating. Removal of the chimney breast can provide more floor space and a more regular shaped room. However, chimney breasts often have structural function. Therefore, removal needs to be done with care, and preferably with professional advice. The removal of part (especially the lower part) of a breast can cause uneven loading on a wall, especially if the upper part is not suitably supported, ideally on an I-beam. [6] In some cases, support on a steel beam and post, or by gallows brackets may be acceptable.

Other factors that need to be considered when removing a chimney breast are: [7]

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Plaster Broad range of building and sculpture materials

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Flue Exhaust for a fireplace, furnace etc

A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself. In the United States, they are also known as vents for boilers and as breeching for water heaters and modern furnaces. They usually operate by buoyancy, also known as the stack effect, or the combustion products may be 'induced' via a blower. As combustion products contain carbon monoxide and other dangerous compounds, proper 'draft', and admission of replacement air is imperative. Building codes, and other standards, regulate their materials, design, and installation.

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The stack effect or chimney effect is the movement of air into and out of buildings through unsealed openings, chimneys, flue-gas stacks, or other containers, resulting from air buoyancy. Buoyancy occurs due to a difference in indoor-to-outdoor air density resulting from temperature and moisture differences. The result is either a positive or negative buoyancy force. The greater the thermal difference and the height of the structure, the greater the buoyancy force, and thus the stack effect. The stack effect helps drive natural ventilation, air infiltration, and fires.

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Flue-gas stack

A flue-gas stack, also known as a smoke stack, chimney stack or simply as a stack, is a type of chimney, a vertical pipe, channel or similar structure through which combustion product gases called flue gases are exhausted to the outside air. Flue gases are produced when coal, oil, natural gas, wood or any other fuel is combusted in an industrial furnace, a power plant's steam-generating boiler, or other large combustion device. Flue gas is usually composed of carbon dioxide (CO2) and water vapor as well as nitrogen and excess oxygen remaining from the intake combustion air. It also contains a small percentage of pollutants such as particulate matter, carbon monoxide, nitrogen oxides and sulfur oxides. The flue gas stacks are often quite tall, up to 400 metres (1300 feet) or more, to increase the stack effect and dispersion of pollutants.

Fireplace mantel Framework around a fireplace

The fireplace mantel or mantelpiece, also known as a chimneypiece, originated in medieval times as a hood that projected over a fire grate to catch the smoke. The term has evolved to include the decorative framework around the fireplace, and can include elaborate designs extending to the ceiling. Mantelpiece is now the general term for the jambs, mantel shelf, and external accessories of a fireplace. For many centuries, the chimneypiece was the most ornamental and most artistic feature of a room, but as fireplaces have become smaller, and modern methods of heating have been introduced, its artistic as well as its practical significance has lessened.

Ephraim Hawley House Building in Connecticut, United States

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References

  1. Jack Stroud Foster; Roger Greeno (2007). Structure and Fabric. Prentice Hall. p. 190. ISBN   978-0-13-197094-6.
  2. Burkinshaw, Ralph; Parrett, Mike (2003). Diagnosing Damp. RICS Books. p. 55. ISBN   9781842190975.
  3. Stephen Emmitt; Christopher A. Gorse; Robin Barry (2005). Barry's Introduction to Construction of Buildings. Wiley-Blackwell. p. 562. ISBN   1-4051-1055-4.
  4. Hugh Chisholm (ed.). Encyclopædia Britannica (11 ed.). p. 527.
  5. Semes, Steven W. (2004). The Architecture of the Classical Interior. W. W. Norton & Company. pp. 149–152. ISBN   9780393730753.
  6. "Am I safe without a chimney breast?".
  7. "Chimney stack removal and the Building Regulations".