Especially difficult details in flashing, counterflashing, coping covers, ridge batten, valleys, fascias, and ventilator flashings had to be solved, combined with the complex historical geometry and heterogeneous construction solutions of a 1050 m2 roofing area. Special copper expansion and contraction details had to be developed for each case. A Cu-DHP CW024A 0.60mm thickness copper was used. Long rafter-length 18 inches field formed pans were used, fixed with copper cleats.
The restoration has renewed the roofs of the transept, chancel, apse and polygonal dome surrounding area of the main building dating back to 1337. And the roofs of the Chapel of Santa Catalina de Siena (1450) and side Chapel of Santa Ana (1465) as well as minor areas.
The monastery, is an outstanding repository of Spanish religious architecture, possesses a unique beauty in its medieval buildings reflecting the traditional architecture. It is an exceptional ensemble comprised of widely differing architectural styles trough a complex historical process.
It is part of the Spanish Historical Heritage through Royal Decree as a National Historic and Artistic Monument since 1879, was declared Historical-Artistical Complex in 1943, and since 1993 is inscribed on the UNESCO’s World Heritage List under criteria(iv) and (vi).