The National Stadium in Warsaw (Narodowy Stadion) which sits over 58,000 spectators, is the largest one in Poland and one of the most modern pitches in Europe. Its construction began in 2008 and ended in 2011, being the opening match played in February 2012. It has been the venue for the UEFA Europa League 2014-2015 final.
Inspired by the Commerzbank-Arena in Frankfurt, it has a retractable PVC roof which unfolds from a spine suspended in the centre of the field. The 240 x 270 m roof structure has its central spire located at a height of 124 m over the Vistula River and 100 m above the playing field.
Since low temperatures can hinder the practice of open-air sports, the stadium is equipped with a heated lawn, training field, illuminated façade and an underground car park. It can also host concerts and other sporting and cultural events. It boasts the largest conference facilities in Warsaw, holding up to 1,600 people. The red and silver tones of the metal mesh façade evoke Poland’s national colours.
Despite its closed roof, the stadium is an open structure with a similar temperature inside and outside its walls. Hence, the Constructors, a German-Austrian-Polish consortium led by the Alpine Bau group, and the of architects – JSK Architects, SL, GMP-von Gerkan, Marg und Partner Architekten and SBP-Schleich Bergermann und Partner – trusted URSA for the insulation.
For that purpose URSA AKP3 / V was used, a mineral glass wool insulation material presented in panels and reinforced with a black glass mesh fabric on one of its sides. Besides a low thermal conductivity, this material offers exceptional sound absorption and a high fire resistance rating (class A1). URSA TWP Silentio was also used due to its great capacity for sound absorption, non-combustibility and great resistance to weight loads.