9374Install Thermal Break Between Metal Elements

The impact of this strategy will vary with the flexibility offered by the geometry of the individual wall component, the on-center spacing of the wall girts, thermal break material and contact resistance between the girt and metal wall before consideration of the thermal break. Figure 9.11 illustrates the impact of thermal breaks of varying types and thicknesses installed between a corrugated metal wall and Z-Girts mounted 6 feet on-center.

To be effective, reduction by a factor of 10 or more in thermal conductivity between the thermal break and the metal may be required for a significant improvement in performance. The nominal thickness of the break also plays an important role. Tests of metal panels indicate that, regardless of the insulator, inserts less than 0.40 inches will not normally be sufficient to prevent substantial loss of their insulation value.

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