Last edited 17 Apr 2017

Shell roof


Shell roofs are made from structural ‘skins’ where the shell material is thin in section relative to the other dimensions of the roof and undergoes relatively little deformation under load.

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:

They are most commonly constructed using insitu reinforced concrete, however, other materials such as and timber and steel may be used for reinforced, lattice or composite structures.

Sydney opera house 2.jpg

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[edit] External references

  • ‘Building Construction Handbook’ (6th ed.), CHUDLEY, R., GREENO, R., Butterworth-Heinemann (2007)