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Hotbox Test R-value Database

Icynene Wall Systems



Description Of Wall

During the summer months of 1997, hot-box test and finite difference computer modeling were used to analyze steady-state thermal performance of the clear wall area and wall interface details for two Icynene wall systems. Both Icynene walls were based on the traditional light-gauge steel framing. C-shaped studs used for testing were made of 18 gauge steel, and they were installed with 16-in. o.c. For both walls, 0.5-in. plywood boards were used as an exterior wall finish. Interior wall surfaces were finished with 0.5-in. thick gypsum boards.

As shown on Figure 1, the first wall had 1-in. metal hat channels attached with 24-in. o.c. to the exterior stud flange surfaces.

Figure 1. Installation of the Icynene foam in the steel stud wall with additional horizontal hat channels.


The second wall utilized the same 2x4 steel studs installed at 16-in. on center. In addition this wall had 1-in. thick XPS foam sheathing. Figure 2 shows installation of the Icynene sprayed foam in the wall cavity.

Figure 2. Installation of the Icynene sprayed foam in the 2x4 steel stud wall with additional XPS foam sheathing.


As shown in Figures 1 and 2, in test both walls, the wall cavities were filled with sprayed foam. Thermal conductivity of the Icynene foam used in hot box tests was measured in the ORNL BTC Laboratory using ASTM C 518 procedure. It was reported as k a = 0.2912 Btu-in./hft 2F (thermal resistivity – R- 3.434 R/per in.).



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