- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
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
An architectural biography. Book review.
The house where the future king of France lived.
The teacher, architectural technologist and mum offers her insights.
Careful planning needed as supply chain issues continue.
The sensitive conversion of a neglected Cornwall structure.
Plan stresses local involvement in city, town and village development.
Environment Agency publishes BAT guidance.
CLC guidance outlines carbon reduction priorities.
Making the most of a staycation.
Organisation urges G20 to revisit wind energy.
The historian spent much of his life compiling architectural resources.
How technology can expose efficiency levels in existing buildings.