NF 200 UM





The current Rafael Coronel Museum, in the city of Zacatecas, was a convent built in 1593 called Convent of San Francisco. Currently it houses world’s largest mask collection, works by Diego Rivera and highlighting more than 16 thousand pieces including his extensive collection of masks from around the world.

The temple belonging to the former monastery was severely damaged by a fire in 1648, loosing its roof. In 2015 a project for rebuilding the roof started, looking to cover it with a material that would respect the view, which had become already traditional for visitors and zacatecanos; the whole 4 walls of the nave and the sky in full view.


The challenge of this project was to make a lightweight structure that was easily supportable by a building over 400 years old. Besides that, being a historical building protected by the National Institute of Anthropology and History, both the structure and the works had to be very sensitive.

Dunn’s team designed a structure and special anchors to meet all the requirements of the authorities. All steel parts of the structure were made at the Dünn’s steel factory: DSS Dynamic Steel Structures.


Dünn Lightweight Architecture was selected to cover the nave and to that purpose it was proposed to use the ETFE material for its characteristics like transparency, lightness, aesthetics, low maintenance and ability to withstand strong winds, rain and even snow.


Dunn’s team designed a structure and special anchors to meet all of the authorities requirements. All the structure’s steel parts were made at the steel mill Dünn: DSS Dynamic
Steel Structures. As a preservation measure of the site, it was forbidden to perform in site welding work, so the Dünn Design Team made a structure with efficient and easy to adjust anchors and fasteners in order to make a very careful assembly on site.

The works were completed in a short time, in order to avoid the cold season in the city, which had its peak on March 9, 2016 with heavy snowfall. Both the structure as well as the ETFE could support the entire load of snow and the subsequent water accumulation.


The Rafael Coronel Museum’s ETFE cover is an extraordinary work, which meets the aesthetic requirements imposed to Dünn: to keep the views from inside of the nave, protecting it from the elements. Furthermore Dünn met both: the structure as well as with the installation; with INAH’s strict rules and those of the authorities responsible for the preservation of historic buildings.