Kashiwagi, Dean, Dhaval Gajjar, Jacob Kashiwagi, and Kenneth Sullivan. 2016. “Hail Study on a 15 Year Old Sprayed Polyurethane Foam Roofing System”. Journal for the Advancement of Performance Information and Value 8 (1):5-1 . https://doi.org/10.37265/japiv.v8i1.47.