- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 14 Sep 2020
They are commonly used where a building interior needs to be free from intermediate walls or columns that might support a more conventional flat or pitched roof, such as; libraries, theatres, leisure centres, airport and railway terminals, and so on.
Shell roofs can be ‘flat’, but are typically curved, assuming a cylindrical, domed, paraboloid or ellipsoid shape. The curvature of shell structures benefits from the same structural efficiency as arches, which are pure compression forms with no tensile stresses. Because of their structural efficiency less material is generally needed compared to more traditional roofs. However, a restraining structure such as an edge beams is required to prevent the shell from ‘spreading’.
Shell roofs may be:
- Single shells such as the dome of the Pantheon in Rome.
- Multi-shell roofs such as Eero Saarinen’s JFK International Airport in New York.
- Reinforced with structural ribs, such as Jørn Utzon’s Sydney Opera House.
- Lattice structures, such as Norman Foster’s Great Court at the British Museum in London.
 Related articles on Designing Buildings Wiki
- A-frame house.
- Barrel vault.
- Conoid shell.
- Domestic roofs.
- Folded plate construction.
- Hyperbolic paraboloid.
- Long span roof.
- Pendentive dome.
- Portal frame.
- Shell and core.
- Sydney Opera House.
- Tensile structures.
- Tension cable and rod connectors.
- The history of fabric structures.
- Types of dome.
- Types of roof.
 External references
- ‘Building Construction Handbook’ (6th ed.), CHUDLEY, R., GREENO, R., Butterworth-Heinemann (2007)
Featured articles and news
Tech tools to help manage people and space post-pandemic.
A style that ranges from mock Tudor to arts and crafts to the 'Wrenaissance'.
Free guide from Secured by Design.
BREEAM strategy for sustainability and the circular economy.
Free tool to improve the construction programming process.
Are buildings doing what they're supposed to be doing?
Cities with quick access to everything by foot or bike.
The pressures and pinch points of global destinations.
Making the case for a sustainable future.
Retrofit professionals now entitled to enter CIOB programme.
How, where, when and why stereotypes happen.
Optimising the best features of both energy performance tools.
BSRIA guidance updated in BG 78/2021 publication.
ISO standard supports crime prevention through environmental design.