Impact resistance of polyurethane foam roofs against hail

Dean T. Kashiwagi, Manoj K. Pandey

Research output: Contribution to journalArticlepeer-review


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 of SPF roof systems. This research identifies: • factors affecting the resistance of the SPF roof systems to hail damage • hail resistance characteristics of the SPF roofs near freezing temperatures • 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 of SPF roofs and recommendations for expanding the FM-SH test.

Original languageEnglish (US)
Pages (from-to)137-152
Number of pages16
JournalJournal of Thermal Envelope and Building Science
Issue number10
StatePublished - Oct 1 1997


  • Elastomeric coatings
  • Factory Mutual Severe Hail (FM-SH) test
  • Hail resistance
  • Oversized hail
  • Roof systems
  • Severe hail damage
  • Sprayed Polyurethane Foam (SPF)

ASJC Scopus subject areas

  • Building and Construction
  • General Materials Science
  • Mechanics of Materials
  • Fluid Flow and Transfer Processes


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