Division 7 Ebook Page 51 Owens Corning Enclosure Solutions NFPA 285 Design Guide

2 The other two national model building codes of that era also required full scale testing for exterior walls. The 1982 SBCCI Standard, and the 1984 BOCA National (Basic) Building Codes stated in their foam plastics chapters, "Results of diversified or full scale fire tests reflecting an end use condition shall be submitted to the building official demonstrating that the (wall) assembly in its final form does not show any tendency to propagate flame over the surface or through the core when exposed on the exterior face to a fire source." The intent was that a predecessor of NFPA 285 be utilized, the "Full Scale Multi-Story Test," as it was called at the time. The NFPA 285 Methodology The 30 minute test is conducted on a full scale two story wall assembly, built as it would be in the field, on the front side of a three sided test structure. (See Figures 1 and 2 that are excerpts from NFPA 285) The test wall, has a window in the center of the lower floor. (See Figures 2 and 3) The test scenario is that a flashover fire, unrelated to the combustibles in the wall, has occurred in the lower story room emitting a fire plume through the window and out of the room of origin. Early in the 30 minute exposure the fire plume wraps around the window head, extending up the exterior surface of the wall. (See Figure 4) To pass, the wall assembly must limit fire spread vertically and horizontally away from the window. The extent of fire spread is determined visually, measured in feet, and by temperature that is measured by thermocouples placed throughout the wall assembly. Figure 5 shows a successful Owens Corning Enclosure Solutions Wall System test with the brick veneer stripped away just above the window lintel. Note the very limited fire spread and melting of the foam continuous insulation. Figure 1: Elevation of test rig, test wall side Figure 2: Section of test rig Figure 3: Test wall under construction Figure 4: Fire emitting from the test window Figure 5: FOAMULAR showing limited damage above the test window with brick veneer stripped away after the fire test

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