- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 13 Oct 2017
Drenchers are a system of water heads that are used for the fire protection. In contrast to sprinklers which are found internally, drenchers are normally found on the exterior of a building to protect against a fire from a neighbouring building. They tend to be positioned on roofs and over windows and external openings.
A drencher system consists of the follows components:
- Water source.
- Pump unit.
- Distribution piping.
- Control fittings.
- Alarm device.
- Special nozzles or water head.
The three main types of drenchers are:
- Roof drenchers: Positioned on the roof ridge and throw a curtain of water upwards.
- Wall or curtain drenchers: Throw a curtain of water over openings or portions of a building most likely to admit fire.
- Window drenchers: Positioned horizontally level with the top of a window so as to protect the opening.
 Find out more
 Related articles on Designing Buildings Wiki
- Business Sprinkler Alliance.
- Case study A for offices to show where automatic sprinklers have the greatest impact.
- Design benefits of automatic sprinkler systems granted under approved document B.
- External fire spread, Supplementary guidance to BR 187 incorporating probabilistic and time-based approaches.
- Fire detection and alarm system.
- Fire in buildings.
- Fire safety design.
- The impact of automatic sprinklers on building design.
Featured articles and news
When is there a right to light, and what happens if it is obstructed?
What would the nationalisation of economic infrastructure mean for GB?
A new guide to improving value by reducing design error.
We've reached 80,000 page views a day and 10,000 registered users. Why not join them?
A masterplan is a framework within which a location is encouraged to develop or change. Read our introductory article.
New consultation announced on a specialist Housing Court to settle landlord-tenant disputes.
ICE responds to a transport consultation advising the government to make decisions enabling more inclusive cities.
BRE and Loughborough University complete first phase refurbishment of demonstration home.
How the risk of collapse of fibrous plaster ceilings is being addressed in theatres.
If you’re a great writer and have practical experience of the construction industry, it could be you.
Frustrated by long documents or technical jargon? Put off by sign-up forms or costs? Take this 5 min survey to help improve construction knowledge.