Impact Resistance of Polyurethane Foam Roofs against Hail

Abstract

Facility managers and insurance carriers with extensive damages to roofs are concerned with the performance of sprayed-in-place elastomeric-coated SPF roof systems. This paper analyzes the resistance of different types ofSPF roofsys tems. This research identifies: • use of the "information theory" to modify and add decision-making information to the Factory Mutual Class I, Severe Hail (FM-SH) test • differences in hail resistance ofSPF roofs and recommendations for expanding the FM-SH test