Postoccupancy performance evaluation of time-of-installation factors: Seven-year study of SPF roofing

Dhaval R. Gajjar, Dean T. Kashiwagi, Kenneth Sullivan, Jacob Kashiwagi

Research output: Contribution to journalArticlepeer-review


Over the past couple of decades, quality has been an area of increased focus. Multiple models and approaches have been proposed to measure the quality in the construction industry. This paper focuses on determining the quality of one of the types of roofing systems used in the construction industry, i.e., sprayed polyurethane foam roofs (SPF roofs). Thirty-seven urethane-coated SPF roofs that were installed in 2005/2006 were visually inspected to measure the percentage of blisters and repairs three times over a period of four years, six years, and seven years. A repairing criteria was established after a six-year mark based on the data that were reported to contractors as vulnerable roofs. Furthermore, the relation between four possible contributing time-of-installation factors - contractor, demographics, season, and difficulty (number of penetrations and size of the roof in square feet) that could affect the quality of the roof was determined. Demographics and difficulty did not affect the quality of the roofs, whereas the contractor and the season when the roof was installed did affect the quality of the roofs.

Original languageEnglish (US)
Article number04014044
JournalJournal of Performance of Constructed Facilities
Issue number2
StatePublished - Apr 1 2015


  • Blister
  • Maintenance
  • Performance evaluation
  • Quality
  • Roofing

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Safety, Risk, Reliability and Quality


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