- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 19 Mar 2021
A chimney is typically a stone, block or brick structure consisting of a wall or walls enclosing one or more flues. A chimney breast is the part of the chimney structure that projects into or out of the building.
The front of the chimney breast is carried over and above a fireplace on a structure referred to as a chimney bar. A fireplace is a very simple combustion chamber, with or without front door, in which fuels are oxidised to obtain thermal energy, which is transferred into a space mainly by radiation.
In many older buildings fireplaces may have been removed, but the chimney breast may have been retained as they can form a significant part of the structure supporting the building. Where fireplaces have been removed, it is best practice to introduce ventilation at the bottom of the flue and to leave it open at the top (perhaps with a cowl to prevent rainwater penetration) to prevent the accumulation of moisture and potential deterioration of the structure. Unused flues may be filled with inert insulating material such as vermiculite that allows some continued movement of air for ventilation.
 Related articles on Designing Buildings Wiki
Featured articles and news
Improving facilities, accessibility and overall appearance.
Free download of TG 12/2021 available.
TESP works with The Youth Group to form skill sharing network.
Big tech collaborates on platform for the built environment.
Letter signed by 21 organisations sent to MHCLG.
A look at the Government's strategic approach.
Steps to help reduce the spread of infection inside buildings.
This social media-centred hobby can be both dangerous and illegal.
Millwork wall treatment with a long and illustrious history.
HSE introduces cumulative exposure calculator.
The Edwardians and their houses.
Cut off from civilian life for over 900 years.
Gaining green support from the carbon giants.
Click the button to subscribe.