Analysis of causes of the end of service life of a spray polyurethane foam and polyurea roofTargo Kalamees, Simo Ilomets, Mattias Põldaru, Paul Klõseiko, Urve Kallavus, Margit Rosenberg and Karl ÕigerE3S Web Conf., 172 (2020) 15002DOI: https://doi.org/10.1051/e3sconf/202017215002