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 and can be used as a roof covering.
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.
In 2004, a documentary film Qudad, Re-inventing a Tradition was made by the filmmaker Caterina Borelli. It documents the restoration of the Amiriya Complex, which was awarded the Aga Khan Award for Architecture in 2007.
- see Great Mosque of Sana'a
- Sutter, Anita (18 December 2006). "Note sur la fabrication du qadâd". Arabian Humanities. Retrieved 13 February 2016.
- "Fodde. The Architecture of Mud and Qudad. DVD Reviews". Internet Archaeology. intarch.ac.uk.
- Resources, Documentary Educational. "DER Documentary: Qudad". www.der.org.
- docued (11 September 2008). "Qudad, Re-inventing a Tradition - PREVIEW" – via YouTube.
- "Qudad, Re-inventing a Tradition". Documentary Educational Resources.
- "Restoration of the Amiriya Complex - Aga Khan Development Network". www.akdn.org.
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