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This report summarizes the results of a test program conducted in 2006 and 2007 by the North American Fire Testing Laboratories (NAFTL) consortium. Gypsum/steel-stud wall assemblies, nominally rated at 1-h, were tested by six different organizations in North America employing ten different furnace facilities following the guidance provided in ASTM E119-00. The participating NAFTL laboratories arrived at an identical 1-h rating for the gypsum wall specimen tested according to their respective standard operating protocols. The average time to failure (defined by the temperatures reached on the unexposed side of the specimen) was 65 ± 2.8 minutes. The variability in individual peak thermocouple temperatures measured at similar locations on the different wall assemblies exceeded ± 50 oF around one hour into the test, and reached a maximum of close to ± 150 F at the average time of failure. Differences in the time to failure for the ten close-to-identical wall assembly tests did not correlate at a statistically significant level with differences in average furnace temperature, the temperature-time integral, changes in ambient temperatures, or standard deviation among the furnace control thermocouple temperatures. Six inter-laboratory tests were also conducted by several Japanese organizations, yielding an average time to failure of 67.1 ± 1.1 minutes. The inter-laboratory program described in this report is the largest ever conducted for fire resistance testing and forms the basis for future programs aimed at testing additional structural materials, elements, and systems subjected to fire test standards referenced in building codes.

Analysis of inter-laboratory testing of non-loadbearing gypsumsteel-stud wall assemblies