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The Amiriya School, built of qadad
A minaret of the over 1300-year-old Great Mosque of Sana'a in Yemen, which is built with qadad. It is now being restored
Close-up of part of the restored Amiriya Complex

Qadad (qadâd, kʉðað) or qudad is a waterproof plaster surface, made of a lime plaster treated with slaked lime and oils and fats. The technique is well over a millennium old[1] and can be used as a roof covering.[2]

Volcanic ash, pumice or other crushed volcanic aggregate are often used as pozzolanic agents.

Due to the slowness of some of the chemical reactions, qadad mortar can take over a hundred days to prepare, from quarrying of raw materials to the beginning of application to the building. It can also take over a year to set fully.[3]

In 2004, a documentary film Qudad, Re-inventing a Tradition[4] was made by the filmmaker Caterina Borelli.[5][6] It documents the restoration of the Amiriya Complex, which was awarded the Aga Khan Award for Architecture in 2007.[7]

See also[edit]


  1. ^ see Great Mosque of Sana'a
  2. ^ Sutter, Anita (18 December 2006). "Note sur la fabrication du qadâd". Arabian Humanities. Retrieved 13 February 2016.
  3. ^ "Fodde. The Architecture of Mud and Qudad. DVD Reviews". Internet Archaeology.
  4. ^ Resources, Documentary Educational. "DER Documentary: Qudad".
  5. ^ docued (11 September 2008). "Qudad, Re-inventing a Tradition - PREVIEW" – via YouTube.
  6. ^ "Qudad, Re-inventing a Tradition". Documentary Educational Resources.
  7. ^ "Restoration of the Amiriya Complex - Aga Khan Development Network".