Table 9.5 combines test results with calculations to estimate the benefits that may be realized utilizing "thermal" girts. Increase Z-Girt-to-Metal Skin Contact Resistance

While the Z-Girt itself does not offer much resistance to heat flow, testing has found that up to half of the resistance of the girt-to-metal skin assembly is attributable to "poor" contact between the girt and the metal skin. Quantitative estimates of the benefit of using less conductive materials to "break" the interface between the two metals are not readily available, but laboratory tests have shown some improvement in thermal performance, just by using half the number of self-tapping screws to fasten the metal skin to the girts.

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