According to NRCA's 2002-03 market survey, spray polyurethane foam- (SPF-) based roof systems accounted for about $475 million of the $29.69 billion total U.S. roofing industry sales in 2002. Because SPF-based roof systems annually capture a significant dollar volume, it is important for roofing contractors and building owners to procure and use SPF materials that meet minimum building code requirements.
SPF currently used in roofing applications does not meet the minimum R-value and dimensional stability requirements of ASTM C1029, "Standard Specification for Spray-Applied Rigid Cellular Polyurethane Thermal Insulation." ASTM C1029 is in the process of being updated, but when changes will be incorporated in a new version of C1029 currently is unknown.
When ASTM C1029 is updated with new requirements for R-value and dimensional stability, SPF that complies with the updated version also will meet minimum building code requirements for five of the six model building codes—BOCA National Building Code, 1999 edition; 1999 Standard Building Code; 2003 International Building Code; 2003 International Residential Code; and Building Construction and Safety Code™ NFPA 5000, 2003 edition.